Particulate coated monofilament devices

Info

Publication number: 20060112968
Type: Application
Filed: Jan 13, 2006
Publication Date: Jun 1, 2006
Inventors: Dale Brown (Wharton, TX), Michael Schweigert (Missouri City, TX)
Application Number: 11/331,513

Abstract

Disclosed are coated monofilament dental devices overcoated with biofilm-responsive particulate abrasives.

Description

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. patent applications Ser. Nos. 09/935,922; 09/935,920; 09/935,921; 09/935,910, each filed 23 Aug. 2001, and entitled respectively, “Physical improvements in coated monofilament dental tapes”; “Monofilament dental tapes with substantive coatings”; “Non-crystalline saliva soluble coatings for elastomeric monofilament tapes”; and ”Monofilament dental tapes with soft abrasive coatings.” This application is copending with U.S. patent applications Ser. Nos. 10/______ and 10/______ (Docket Nos. 5369/00026 and 5369/00027), each filed on the same date as this application and entitled, respectively, “Coated Multifilament Dental Devices Overcoated with Imbedded Particulate” and “Coated Micromesh Dental Devices Overcoated with Imbedded Particulate. The disclosures of these applications are hereby incorporated herein by reference.

BACKGROUND OF THE INVENTION

Dental floss is defined in Webster's New World Dictionary, 1983, as“ . . . thread for removing food particles between the teeth.”

The concept of using dental floss for cleansing interproximal spaces appears to have been introduced by Parmly in 1819, Practical Guide to the Management of Teeth, Cullins & Croft Philadelphia, Pa. Numerous types of floss were developed and used for cleaning interproximal and subgingival surfaces, until finally in 1948 Bass established the optimum characteristics of dental floss, Dental Items of Interest, 70, 921-34 (1948).

Bass cautioned that dental floss treated with sizing, binders and/or wax produces a “cord” effect as distinguished from the desired “spread filament effect”. This cord effect reduces flossing efficiency dramatically and visually eliminates splaying (i.e., the flattening and spreading out of filaments) necessary to achieve the required interproximal and subgingival mechanical cleaning. This cleaning is then required to be followed by the entrapment and removal of debris, plaque and microscopic materials from interproximal spaces by the “spread” floss as it is removed from between teeth.

Proper use of dental floss is necessary to clean the considerable surface area on the interproximal surfaces of teeth, which cannot usually be reached by other cleaning methods or agents, e.g., the bristles of a toothbrush, the swishing action of a rinse, or by the pulsating stream from an oral irrigator.

Historically, the purpose of dental floss was to:

(1) dislodge and remove any decomposing food material, debris, etc., that has accumulated at the interproximal surfaces, which could not be removed by other oral hygiene means, and
(2) dislodge and remove as much as possible the growth of bacterial material (plaque, tartar, calculus) that had accumulated there since the previous cleaning.

Effective oral hygiene requires that three control elements be maintained by the individual:

(1) Physical removal of stains, plaque and tartar. This is accomplished in the strongest sense by scraping and abrasion in the dentist's office. Self administered procedures are required frequently between visits and range from tooth brushing with an appropriate abrasive toothpaste through flossing and water jet action down to certain abrasive foods and even the action of the tongue against tooth surfaces.
(2) Surfactant Cleaning. This is required to remove: food debris and staining substances before they adhere to the tooth surface; normal dead cellular (epithelial) material which is continually sloughed off from the surfaces of the oral cavity and microbial degradation products derived from all of the above. Besides the obvious hygienic and health benefits related to simple cleanliness provided by surfactants, there is an important cosmetic and sense-of-well-being benefit provided by surfactant cleansing. Research has shown that the primary source of bad breath is the retention and subsequent degradation of dead cellular material sloughed off continuously by the normal, healthy mouth.
(3) Frequency of Cleansing. This is perhaps the most difficult to provide in today's fast-paced work and social environment. Most people recognize that their teeth should be brushed at least 3 times a day and flossed at least once a day. The simple fact is that most of the population brush once a day, some brush morning and evening, but precious few carry toothbrush and dentifrice to use the other three or four times a day for optimal oral hygiene. Consumer research suggests that the population brushes an average of 1.3 times a day. Most surprising, less than 15% of adults floss regularly. Reasons offered for not flossing: difficult to do, painful, not effective, doesn't seem to do anything, and leaves a bad taste.

Most commercial interproximal devices marketed at the present time contain various coatings of wax or wax like substances that function as: binders for the various multifilament flosses to minimize fraying, lubricants, flavor carriers, and/or fluoride carriers. When added to various monofilament dental tapes, generally at substantially lower levels, wax functions as a lubricant and/or flavor/active ingredient carrier.

An almost universal shortcoming common to most waxed dental flosses and to all coated monofilament dental tapes is the user perception during flossing that the dental floss or dental tape is “not working” and/or “not cleaning”, etc.

In fact, most of these devices have only marginal efficacy with respect to removing biofilms (plaque). Biofllms generally require physical abrasive-type action to be effectively removed. Periodic professional cleaning is a recommended means for effectively controlling biofilm formation.

The classification of plaque as a biofilm is considered a major advance in the development of more effective “self-treatment” oral care products. See the following biofilm references:

Greenstein and Polson, J. Periodontol., May 1998, 69:5:507-520; van Winkelhoff, et al., J. Clin. Periodontol., 1989, 16:128-131; and Wilson, J. Med. Microbiol., 1996, 44:79-87.

- Biofilms are defined as “ . . . matrix-enclosed bacterial population adherent to each other and to the surface or intersurfaces. These masses secrete an exopolysaccharide matrix for protection. Considerably higher concentrations of drugs are needed to kill bacteria in biofilms than organisms in aqueous suspensions.”

Costerton, J. W., Lewandowski, Z., DeBeer, D., Caldwell, D., Korber, D., James, G. Biofilms, the customized microniche. J. Bacteriol., 1994, 176:2137-2142.

- The unique attributes of biofilms is being recognized as increasingly important in the 1990's. Future studies into the mode of growth of biofilms will allow manipulation of the bacterial distribution.

Douglass, C. W., Fox, C. H. Cross-sectional studies in periodontal disease: Current status and implications for dental practice. Adv. Dent. Res., 1993, 7:26-31.

- The number of adults over 55 who will need periodontal services will increase. The type of services will need to be adjusted to meet the need.

Greenstein, G. J., Periodontal response to mechanical non-surgical therapy: A review. Periodontol., 1992, 63:118-130.

- Mechanical therapy remains effective with caveats of compliance and skill of therapists.
- Marsh, P. D., Bradshaw, D. J. Physiological approaches to the control of oral biofilms. Adv. Dent. Res., 1997, 11:176-185.
- Most laboratory and clinical findings support the concept of physiological control. Further studies will reveal details of biofilm diversity.

Page, R. C., Offenbacher, S., Shroeder, H., Seymour, G. J., Kornman, K. S. Advances in the pathogenesis of periodontitis: Summary of developments, clinical implications and future directions. Periodont. 2000, 1997, 14:216-248.

- Genetic susceptibility to three oral anaerobic bacteria play an important part in the progression of periodontitis. Acquired and environmental risk factors exacerbate the problem. Mechanical disruption will remain an effective and essential part of periodontal therapy.
- Papapanou, P. N., Engebretson, S. P., Lamster, I. B. Current and future approaches for diagnosis of periodontal disease. NY State Dent. J., 1999, 32-39.
- New techniques are available such as a novel pocket depth measurement device, microscopic techniques, immunoassay, DNA probes, BANA hydrolysis tests. These more clearly define the nature of periodontitis.

SUMMARY OF THE INVENTION

The present invention is directed to biofilm-responsive, coated monofilament dental tapes suitable for physical-abrasive-type removal, disruption and/or control of biofilms that form on interproximal and/or subgingival tooth surfaces not reachable by brushing or rinsing. The coated monofilament dental tapes of the present invention are overcoated with a particulate abrasive that remains substantive to the monofilament tape base coating until said base coating is released during flossing. During flossing, the particulate abrasive overcoating of the present invention separates from the released base coating to work in conjunction with the dental tape. That is, the released particulate abrasive cooperates with the monofilament dental tape as the tape is being worked interproximally and subgingivally to deliver physical-abrasive-type cleaning, disruption and/or control of biofilms formed on interproximal and subgingival tooth surfaces.

The physical-abrasive-type cleaning, disruption and/or control of biofilms achieved with the particulate abrasive overcoated monofilament dental tapes of the present invention continues until:

- the monofilament dental tape is removed from the space and flossing of the area is discontinued,
- the particulate abrasive dissolves and/or is washed away, and/or
- the biofilm is physically removed, disrupted and/or controlled.

The physical-abrasive-type cleaning, disruption and/or control of biofilms with the particulate abrasive overcoated monofilament dental tapes of the present invention can be simultaneously improved further with a chemotherapeutic treatment of the particulate abrasive monofilament tape effected biofilm by various chemotherapeutic substances contained in the base coating and/or in the particulate overcoating, which chemotherapeutic substances are released onto the tooth surfaces during flossing along with the particulate abrasive.

Accordingly, one embodiment of the present invention comprises biofilm-responsive monofilament dental tape devices.

A further embodiment of the present invention comprises coated monofilament dental tape devices with releasable particulate abrasives that are biofilm-responsive during flossing.

Another embodiment of the invention comprises a self-treatment means for routinely removing, disrupting and/or controlling biofilms formed on interproximal and subgingival tooth surfaces.

Still another embodiment of the invention comprises a method for overcoating coated monofilament dental tapes with releasable particulate abrasives of various particle sizes and particle size distributions, in order to remove, disrupt and/or control biofilms.

Yet another embodiment of the invention comprises a method for removing, disrupting and/or controlling biofilms that form on interproximal and subgingival tooth surfaces.

A further embodiment of the invention comprises biofilm-responsive monofilament dental devices overcoated with particulate abrasives and containing a saliva soluble base coating which contains an antimicrobial.

Another embodiment of the invention comprises biofilm-responsive monofilament dental devices overcoated with active particulate abrasives such as whitening and tartar control abrasives.

Still another embodiment of the invention comprises biofilm-responsive monofilament dental devices overcoated with dental particulate abrasives including silica, pumice, alumina, calcium carbonate and dicalcium phosphate dihydrate.

Yet another embodiment of the invention comprises biofilm-responsive, monofilament dental devices overcoated with imbedded particulate abrasives, where said abrasives contain other substances ranging from flavorants, antimicrobials and cleaning substances to mouth conditioners and various pharmaceutical substances.

A further embodiment of the invention comprises improved waxed monofilament dental tapes with an overcoating of imbedded particulate abrasive.

Still another embodiment of the invention comprises improved waxed monofilament dental tapes with overcoatings of imbedded particulate abrasive and saliva soluble particulate substances containing flavorant and mouth conditioning substances.

Another embodiment of the invention comprises improved waxed monofilament dental tapes with an overcoating of imbedded particulate abrasive containing a saliva soluble, substance containing flavorant and mouth conditioners.

Yet another embodiment of the invention comprises a method for improving monofilament dental tapes comprising sequential overcoating of said base coated monofilament dental tapes with two or more particulates having substantially different densities, wherein said various particulates are imbedded into the base coating prior to cooling and solidifying said base coating.

Still another embodiment of the invention comprises improved commercial, emulsion coated monofilament dental tape with an overcoating of imbedded particulate abrasive.

For purposes of describing the present invention, the following terms are defined as set out below:

“Monofilament dental devices” are defined as interproximal dental devices such as monofilament dental tape constructed of a single continuous monofilament, which can be extruded, slit from a film, etc. Examples of these devices are described in the following U.S. patents:

Re. 35,439; 3,800,812; 4,974,615; 5,760,117; 5,433,226; 5,479,952; 5,503,842; 5,755,243; 5,845,652; 5,884,639; 5,918,609; 5,962,572; 5,998,431; 6,003,525; 6,083,208; 6,198,830; 6,161,555; 6,027,192; 5,209,251; 5,033,488; 5,518,012; 5,911,228; 5,220,932; 4,776,358; 5,718,251; 5,848,600; 5,787,758; and 5,765,576,

the disclosures of which are hereby incorporated by reference.

Preferred monofilament dental devices include polytetrafluoroethylene (PTFE), polyethylene, polypropylene, etc., devices.

Particularly preferred monofilament dental devices include elastomeric monofilament dental devices such as detailed in Tables 3 through 7 below and described and claimed in the co-pending Patent Application entitled, “Elastomeric monofilament dental tapes,” filed Aug. 23, 2001, which is hereby incorporated by reference.

“Coatings” for the monofilament dental devices are defined as those substances that coat monofilament dental devices for purposes of: lubrication and ease of tape insertion for carrying flavors and other additives, providing “hand” so the device can be wound around the fingers, etc. Preferred coatings include those emulsion coatings described in the following U.S. Pat. Nos. 4,950,479; 5,032,387; 5,538,667; 5,561,959; and 5,665,374, which are hereby incorporated by reference.

Particularly preferred coatings include those saliva soluble coatings for monofilament dental tapes described and claimed in co-pending U.S. patent applications Ser. Nos. 09/935,922; 09/935,920; 09/935,921 and 09/935,710, all filed on 23 Aug. 2001, which are hereby incorporated by reference. Particularly preferred coatings are the crystal-free coatings described in Tables 8 and 9 below.

“Particulate abrasives” are defined as saliva soluble, semi-soluble and insoluble abrasive substances having a wide range of particle sizes and particle size distribution.

Preferred particulate abrasives include various inorganics such as glass beads, and various organics such as particles of polyethylene, polypropylene, etc.

Particularly preferred inorganic particulate abrasives include various dental abrasives such as: pumice, silica, alumina, silicon dioxide, magnesium oxide, aluminum hydroxide, diatomaceous earth, sodium potassium aluminum silicate, zirconium silicate, calcium carbonate, calcium silicate, fumed silica, hydrated silica, dicalcium phosphate dihydrate, anhydrous dicalcium phosphate, sodium tripolyphosphate, etc. See also Table 1 below.

Particularly preferred “active” particulate abrasives include:

peroxides such as: carbamide peroxide, calcium peroxide, sodium perborate, sodium percarbonate, magnesium peroxide, sodium peroxide, etc.;

phosphates such as: sodium hexametaphosphate, tricalcium phosphate, etc.; and pyrophosphates such as: tetrasodium pyrophosphate, tetrapotassium pyrophosphate, sodium acid pyrophosphate, calcium pyrophosphate, etc. See also Table 2 below. See also the following relevant U.S. patents: U.S. Pat. Nos. 6,221,341; 3,491,776; 3,330,732; 3,699,979; 2,700,636; 5,220,932; 4,776,358; 5,718,251; 5,848,600; 5,787,758; and 5,765,576.

“Releasable” particulate abrasive is defined as the property whereby particulate abrasive, which is adhered to the base coating of monofilament dental tape, remains substantive to said base coating until flossing begins, at which time the particulate abrasive separates from the saliva soluble base coating and remains available interproximally and subgingivally to work with the monofilament tape, responding to biofilms encountered on subgingival, interproximal and supragingival tooth surfaces with physical-abrasive-type cleaning.

“Particulate abrasive load” is defined as the percent by weight of particulate abrasive contained on the coated monofilament dental device as a percent by weight of the device. See Tables 1, 2 and 9 below.

“Base coat monofilament device load” is defined as the percent by weight of the base coating contained on the monofilament device as a percent by weight of the coated monofilament device.

“Total coating load” is defined as the percent by weight of the base coating plus the particulate abrasive overcoating contained on the monofilament device as a percent by weight of the device.

“Perceived Abrasive Factor (PAF)” is defined as the subjective level of perceived abrasivity when:

(1) winding the coated monofilament device around the fingers (i.e., “hand”), and

(2) when working the device across tooth surfaces with a sawing action.

PAF grades range from 0 through 4, i.e., imperceptible (0), slightly perceptible (1), perceptible (2), very perceptible (3) and very abrasive (4). See Tables 1, 2 and 9 below. PAF values of about 2 or greater are preferred. PAF values above 3 are particularly preferred.

“Incidental Release Factor (IRF)” is defined as the percent by weight of the particulate abrasive retained on the coated monofilament dental device, when an 18 inch piece of the device is removed from a dispenser and wrapped around two fingers prior to flossing. (See Tables 1, 2 and 9.)

“Biofilm responsive” is defined as the property of particulate abrasives to work cooperatively with monofilament dental tapes and other cleaning and/or chemotherapeutic substances in the base coating to remove, disrupt and/or control biofilms when released from the coated monofilament tapes during flossing.

“Fluidized bed” is defined as a means of converting solid particulate abrasives into an expanded, suspended, solvent-free mass that has many properties of a liquid. This mass of suspended particulate abrasive has zero angle of repose, seeks its own level, while assuming the shape of the containing vessel.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic side view of a particulate abrasive overcoating system of the invention suitable for overcoating coated monofilament devices.

FIG. 1a is a schematic side view of a particulate overcoating system as shown in FIG. 1, with the filter means replaced by fitted with means to recover the particulate overspray that does not contact the monofilament during the overcoating operation.

FIG. 2 is an enlarged top view of the system shown in FIG. 1 showing coated monofilament dental tape passing through the particulate abrasive coating chamber.

FIG. 3 is an expanded side view of a coated monofilament dental device showing a liquid base coating on both sides of the monofilament dental tape prior to entering the particulate abrasive coating chamber.

FIG. 4 is an expanded side view of coated monofilament dental tape showing particulate abrasive impinged onto the liquid base coating as the monofilament dental tape is passing through the particulate abrasive coating chamber.

FIG. 5 is an expanded side view of coated monofilament dental tape showing particulate abrasive adhered to the solidified base coating after the particulate abrasive overcoated, monofilament tape has been passed through a cooling zone (not shown).

FIG. 6 is a schematic side view of an alternative particulate abrasive overcoating system of the present invention suitable for overcoating coated monofilament devices.

FIG. 7 is a schematic side view of another alternative particulate overcoating system of the present invention suitable for overcoating wax-type coated monofilament devices, where the particulate used for overcoating is not detailed.

FIG. 8 is similar to FIG. 7, with the particulate used for overcoating shown in detail.

FIG. 9 is a schematic flow chart for particulate overcoating of coated monofilament dental floss.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIG. 1 which is a schematic side view of a particulate abrasive overcoating system comprising: particulate abrasive coating system, 1, consisting of fluidized bed means, 2, comprising: fluidized particulate abrasive, 3, membrane, 4, fluidizing air means, 5, stand pipe, 6, in communication with particulate abrasive nozzle means, 7, provided with pump means, 8, which contains nozzle air input means, 9, and pump cleaning means, 10.

Particulate abrasive coating system, 1, is provided with hinged access means, 11 and 15, and filter means, 12, particulate abrasive filling means, 13, and coated elastomeric, monofilament dental tape particulate abrasive coating zone, 14, and coated elastomeric monofilament dental tapes, 15. Filter means, 12, can be assisted by a vacuum cyclone means which capture all unused particulate, 3, overspray and recycles same. This is detailed in FIG. 1a.

Coated elastomeric monofilament dental tape, 15, with a liquid coating contained thereon, passes through particulate abrasive coating zone, 14, where particulate, 3, is introduced onto the liquid coating on tape, 15, from nozzle means, 7.

Referring to FIG. 1a, vacuum cyclone means, 60, replaces former filter menas, 12, and is connected to the top of particulate coating system, 1, at juncture 61, via tubing means, 62. Vacuum cyclone means, 60, maintains a slight negative pressure within particulate coating system, 1, by drawing air and some dispersed particulate from coating system, 1, and introducing this air/particulate mixture into vacuum cyclone chamber, 63, where particulate, 3, is introduced into holding means, 64, and the remaining air substantially free from particulate, 3, passes through the top of chamber, 63, through tubing, 65, via motor, 67, into filter means, 66 and 66′. Alternatively, particulate, 3, is captured by collecting means, 68, with air regulator, 69, and returned to particulate coating system, 1, via tubing, 70.

Referring to FIG. 2, which is an enlarged top view of particulate coating system, 1. Elastomeric monofilament dental tape, 15, with liquid base coating, 16, thereon, passes through particulate abrasive coating zone, 14, where particulate abrasive, 3, from nozzle means, 7, is introduced via impinging onto liquid base coating, 16, which is substantive to tape, 15, as tape, 15, passes through particulate coating zone, 14.

Referring to FIG. 3, which is an expanded side view of monofilament tape, 15, showing base liquid coatings, 16 and 16′, thereon before the tape, 15, passes into particulate abrasive coating zone, 14. The base coatings, 16 and 16′, have been heated and are in a liquid state and substantive to both sides of monofilament tape, 15.

Referring to FIG. 4, which illustrates an expanded side view of coated monofilament tape, 15, showing base liquid coatings, 16 and 16′ containing particulate abrasives, 3 and 3′, imbedded in the liquid coatings, 16 and 16′.

Referring to FIG. 5, which is an expanded side view of coated monofilament dental tape, 15, showing base coatings, 16 and 16′, that have been passed through a cooling zone (not shown) sufficient to be solidified with particulate abrasive, 3 and 3′, firmly imbedded in the solidified liquid coatings, 16 and 16′.

Referring to FIG. 6, which is a schematic side view of an alternative particulate abrasive overcoating system, 20, for delivering a particulate abrasive, 21, from a vessel or fluidized-bed means, 30, to a conveying agent means, 22, with gear drive means, 23. The speed of conveying auger, 22, is controlled by motor driven gear means, 23, which is slaved to a surface speed controller, not shown, for monofilament tape, 24. As the monofilament tape, 24, moves faster, auger means, 22, speeds up and delivers more particulate abrasive, 21, to the surface of molten-coated monofilament tape, 24. This system then allows for the delivery of a constant density of particulate abrasive, 21, per square millimeter of monofilament tape, 24.

In the foregoing system, the particulate abrasive, 21, may be pumice of average particulate size of 37 microns which are fluidized with a porous plate of sintered polyethylene powder of 0.5 inch thickness. The plate has an average pore size of 20 microns. As the fluidized pumice is presented to auger means, 23, it is pulled down the shaft and presented to venturi means, 25. Control of the air flow in proportion to the speed allows uniform delivery of pumice to a surface of monofilament tape, 24, passing under the outlet of venturi means, 25. This arrangement allows delivery of uniform particle density with very low air speed, consistent with little perturbation of the tape traverse.

Referring to FIGS. 7 and 8, which are two separate schematic side views of another alternative particulate overcoating system, 40, for delivering particulates, 41, from a fluidized bed means, 42, to monofilament flosses, 43 and 43′.

Air chamber means, 44, introduces air under low pressure through distributor plate means, 45, which in turn fluidizes particulates, 41, in fluidized bed means, 46. Particulates, 41, are introduced from fluidized bed, 46, into particulate coating chamber, 47, by particulate metering means, 48. Particulate coating chamber, 47, is provided with venturi means, 49. Modulating particulate dispensing means, 50, is provided with high velocity, low volume air means (not shown) providing turbulence to fluidized particulate, 41, prior to said particulate imbedding coatings, 51 and 51′, on the monofilament floss filaments, 43 and 43′, respectively. Particulate dispensing means, 50, enhances the uniformity of the particulate, 41, overcoating, 52 and 52′, imbedded into coatings, 51 and 51′, respectively.

Referring to FIG. 8, generally the pressure in air chamber, 44, is between 4 and 8 psi. Distributor plate, 45, is preferably a porous polyethylene means that creates air bubbles required to fluidize particulates, 41, in fluidized bed, 42. The air pressure in fluidized bed, 42, is preferably in the 0.2 to 0.5 psi range. Particulate metering means, 48, can take many shapes other than that of the threaded means depicted. For example, metering means can be a plug or ram without threads that controls the flow of particulates, 41, from fluidized bed, 42, into particulate coating chamber, 47. Lowering metering means, 48, into particulate coating chamber, 47, as shown by dotted lines, 52, further restricts the flow of fluidized particulate, 41, through distance, 53. Thus, particulate metering means, 48, determines the quantity of fluidized particulate, 41, to enter particulate metering area, 47. This control in combination with modulated air flow through particulate dispersing means, 50, produces a substantially uniform density particulate on coating, 51, with imbedded particulates, 52, being dispersed substantially uniformly throughout coating, 51.

For a production system comprising up to 32 monofilament lines running side-by-side, the particulate overcoating system, 40, will be replicated in groups of 8, with two such groups covering the total of 32 lines running side-by-side.

Referring to FIG. 9, which is a schematic flow chart for particulate overcoating of coated monofilament dental floss, monofilament floss is passed through liquid base coating zone where the base coating is applied. Particulate overcoating is applied by introducing the coated monofilament into one or two particulate overcoating zones, after which the particulate overcoated monofilament floss passes through a cooling zone, followed by passing the overcoated monofilament through a particulate compression means before being introduced to a take-up winder means.

The particulate abrasives of the present invention are applied to the coated monofilament dental tape base coatings as a solid material totally free from solvents.

A preferred method of applying the particulate abrasive overcoatings to the coated monofilament device is by means of an innovative fluidized bed system such as shown in FIG. 1.

Membrane means, 4, is used to maintain the particulate abrasive, 3, in a state of continued fluidization, i.e., fluidized bed, 2. Particulate abrasive, 3, from fluidized bed, 2, is introduced into nozzle means, 7, through stand pipe means, 6, via pump means, 8.

Referring to FIG. 2, coated monofilament dental tape, 15, passes through particulate abrasive coating zone, 14, and is coated on both sides with particulate abrasive, 3 and 3′, as shown in FIGS. 4 and 5.

Adhesion of the particulate abrasive to the coated monofilament dental device is achieved by means of the hot, liquid base coating that is present on the monofilament device at the time the particulate abrasive, 3 and 3′, impinges the tape coatings, 16 and 16′. See FIGS. 4 and 5.

That is, the particulate abrasive, 3, impinges onto liquid coatings, 16 and 16′, which are substantive to monofilament device, 15, as the device passes through coating zone, 14, and particulate abrasives, 3 and 3′, are trapped by and mechanically adheres to the hot, viscous base coating, 16 and 16′, respectively, which is a viscous liquid generally at a temperature between about 48° C. and 110° C. with a viscosity between 10 and 10,000 cs. This is illustrated in FIGS. 4 and 5.

The particulate abrasive, overcoated, monofilament dental tape then proceeds through a cooling means (not shown), where the base coating, 16 and 16′, cools and solidifies with the particulate abrasive, 3 and 3′, adhered thereto, as illustrated in FIG. 5.

The innovative fluidized bed coating process of the present invention is most effective in delivering:

(1) particulate abrasive loads between about 2 and about 45 percent by weight of the device,

(2) particulate abrasive overcoated monofilament devices with a perceived abrasive factor (PAF) between about 2 and 4, and

(3) particulate abrasive, overcoated, monofilament devices with an Incidental Release Factor (IRF) value well above 80%.

It has been discovered that in order to produce a coated monofilament dental device with PAF values in the 3 to 4 range, it is necessary: (1) to produce particulate abrasive loads at between about 10 and 34 percent by weight of the device, (2) to restrict the average particle size of the particulate abrasive to between about 7 microns and about 200 microns, and (3) to restrict particle size distributions to from between about 5 microns and about 300 microns.

Dental particulate abrasives overcoated onto a standard coated monofilament dental tape and suitable for purposes of the present invention illustrated in Examples 1 through 7, are described in Table 1 below:

TABLE 1 “Dental” Particulate Abrasives Avg. Particulate Projected Projected Particle Particle Size Abrasive Load Incidental Perceived Particulate Size (in Distribution as % by wt. of Release Factor Abrasive Factor Example # Abrasive(s) microns) (in microns) device (IRF) in % (PAF) Comments 1 pumice 35 4-120 23 95 3.5 Ideal professional product 2 silica 10 2-18 10 98 1.5 — 3 pumice & 12 2-120 16 96 2.5 Ideal for stain fighting silica 4 dicalcium 55 18-100 15 98 1.5 Supports toothpaste positioning phosphate dihydrate 5 alumina 25 10-75 20 94 3.7 — 6 calcium 50 15-80 16 97 2.0 — carbonate 7 polyethylene 20 8-40 12 98 1.5 Supports soft abrasive positioning

“Active” particulate abrasives overcoated onto a standard coated monofilament dental tape and suitable for purposes of the present invention are illustrated in Examples 8 through 12 in Table 2 below:

TABLE 2 “Active” Particulate Abrasives Particulate Projected Projected Avg. Particle Size Abrasive Load Incidental Perceived Particulate Particle Size Distribution as % by wt. of Release Factor Abrasive Factor Example # Abrasive(s) (in microns) (in microns) device (IRF) in % (PAF) Comments 8 tricalcium 60 10-150 10 90 3.0 Excellent tartar phosphate & silica control product 9 tetrapotassium 65 20-175 12 90 2.5 Tartar control prospect pyrophosphate & pumice 10 tetra sodium 70 20-150 8 90 2.5 Excellent tartar pyrophosphate control product 11 sodium 75 20-175 17 85 3.0 Excellent whitening hexametaphosphate product & pumice 12 calcium 9 4-35 20 98 2.0 — pyrophosphate & silica

Suitable particulate abrasives for the present invention can also contain active ingredients “dusted” thereon. For example, when antimicrobials such as cetylpyridinium chloride, triclosan, chlorhexidine, etc., can be dusted onto the particulate abrasives prior to overcoating the coated monofilament tape. During flossing, these antimicrobial containing particulate abrasives are released from the coated monofilament dental tapes and the dusted on antimicrobials release from the particulate abrasive and remain available interproximally and subgingivally to work with the monofilament dental tape during flossing as biofilms are being removed, disrupted and/or controlled.

The enhanced softness of the preferred elastomeric monofilament dental tapes suitable for use with the present invention is key to the tapes' consumer perception of gentleness, which is a distinct advantage over current commercial monofilament tapes and multifilament waxed flosses.

Wound bobbins of monofilament dental tapes suitable for overcoating with the particulate abrasive overcoatings of the present invention showed substantially lower Shore D hardness values than competitive tapes when tested with the Flexbar Portable Shore Haidness Tester Model Number 18877. See Table 3 below. This aspect of gentleness, of course, is primarily attributed to the substantive, saliva soluble, flake-free base coatings, such as described in Table 8, applied to the various monofilament tapes prior to overcoating.

TABLE 3 Shore D Bobbin Type Polymer Tape Tape Coating Hardness Glide ® Floss - mint PTFE Wax 36 Glide ® Tape PTFE Wax 36 Oral-B ® Satin ® Bicomponent Wax 29 Tape - mint Fibaclean ™ unwaxed PEBA None 37 Fibaclean ™ noncrystalline PEBA Noncrystalline 27 coating Non flaking

Tables 4 through 7 below describe in detail monofilament tapes suitable for overcoating with the particulate-abrasives of the present invention. The “UTILITY FACTORS”: Gentleness Perception, Tape Flex-Twist Index and Hardness Shore D of these monofilament dental tapes when combined with various base coatings as described in Table 8, Examples 71 through 88 contribute to a consumer perception of gentleness. The particulate abrasive overcoatings added to these monofilament tapes imparts a perception of “working” to the perception of gentleness.

TABLE 4 Examples of Suitable Monofilament Dental Tapes TAPE COMPOSITION Secondary Thermoplastic Silicone Polymer Other Add'n Ex. Elastomer Trade Process TiO₂ added Type No. Type Manufacturer Name Grade Aid (%) (%) Type (%) (%) 13 PEBA Atofina PEBAX 55/33 3.5 1.8 PP - 4.7 — polyester amide 14 PEBA ″ ″ ″ 3.5 1.8 PP - 4.7 — polyester amide Adflex - 5 15 PEBA ″ ″ ″ 3.5 1.8 PP - 9.7 — polyester amide 16 PEBA Atofina PEBAX 63/33 0 0 0 — polyester amide 17 PEBA ″ ″ ″ 0 1.8 PP - 1.2 — polyester amide 18 PEBA ″ ″ ″ 3.5 1.8 PP - 4.7 — polyester amide 19 PEBA ″ ″ ″ 3.5 1.8 PP - 4.7 — polyester amide Adflex - 5 20 PEBA ″ ″ ″ 3.5 1.8 PP - 9.7 — polyester amide 21 PEBA ″ ″ ″ 3.5 1.8 PP - 4.7 — polyester amide Nylon 11 - 5 22 TPE DuPont Hytrel 6359FG 2.3 1.0 0 Ca Stearate polyether ester 0.1 23 TPE ″ ″ ″ 3.5 1.8 PP - 4.7 Ca Stearate polyether ester 0.1 24 TPE-E DSM Arnitel PM581 0 0 0 — polyether ester 25 TPE-E ″ ″ ″ 0 1.8 PP - 1.2 — polyether ester 26 TPE-E ″ ″ ″ 3 0 PBT - 5 — polyether ester 27 TPE-E ″ ″ ″ 0 0 PBT - 5 — polyether ester 28 TPE-E ″ ″ ″ 0 1.8 PP - 1.2 — polyether ester PBT - 5 PROCESSING PROPERTIES UTILITY FACTORS CONDITIONS Break Elongation Tape Draw Strength to DIMENSIONS Flex Ex. Melt Temp Draw in Break Elastic Width Thick Gentleness Twist Hardness No. Temp ° C. ° C. Ratio Newtons (%) Limit Decitex (mm) (mm) Perception Index Shore D 13 260 130 6.8:1 30 26 0 750 1.30 0.063 6 4 37 14 260 130 6.5:1 27 18 0 760 1.30 0.063 6 4 37 15 260 130 6.8:1 26 19 0 760 1.30 0.063 6 4 37 16 260 135 6:1 30 15 0 805 1.44 0.065 5.5 4 36 17 260 135 6.3:1 32.36 13 0 800 1.41 0.067 5.5 4 36 18 260 135 6.2:1 33.47 17 0 860 1.36 0.066 5.5 4 36 19 260 135 6.2:1 25.94 14 0 810 1.32 0.078 5.5 4 36 20 260 135 6.2:1 29.46 14 0 780 1.34 0.069 5.5 4 36 21 260 135 6.2:1 30.63 13 0 810 1.30 0.065 5.5 4 36 22 225 130 5:1 20 20 15 1400 1.70 0.070 7 3 33 23 225 140 5.7:1 24 14 10 1230 1.70 0.070 7 3 33 24 235 140 4.3:1 18 13 10 1500 1.63 0.084 7 3 33 25 240 115 4.3:1 19 14 5 1634 1.64 0.085 7 3 33 26 235 140 4.3:1 19 10 2 1580 1.68 0.079 7 3 33 27 235 140 4.3:1 18 12 3 1500 1.70 0.086 7 3 33 28 235 140 4.3:1 21 15 4 1575 1.77 0.083 7 3 33

TABLE 5 Examples of Suitable Monofilament Dental Tapes TAPE COMPOSITION Secondary Thermoplastic Silicone Polymer Other Add'n Ex. Elastomer Trade Process TiO₂ added Type No. Type Manufacturer Name Grade Aid (%) (%) Type (%) (%) 29 TPE-E DSM Arnitel EM550 0 0 0 — polyether ester 30 TPE-E ″ ″ ″ 0 1.8 PP - 1.2 — polyether ester 31 TPE-E ″ ″ ″ 0 1.8 PP - 6.2 — polyether ester 32 TPE-E ″ ″ ″ 0 0 PBT - 5 — polyether ester 33 TPE-E OSM Arnitel EM630 0 0 0 — polyester ester 34 TPE-E ″ ″ ″ 0 1.8 PP - 1.2 — polyester ester 35 TPE-E ″ ″ ″ 0 1.8 PP - 1.2 — polyester ester Adflex - 5 36 TPE-E ″ ″ ″ 0 1.8 PP - 6.2 — polyester ester 37 TPE-E ″ ″ ″ 0 0 PBT - 5 — polyester ester 38 TPE-E DSM Arnitel UM552 0 0 0 — polyester ester 39 TPE-E ″ ″ ″ 0 0 0 Ca Stearate polyester ester 0.1 40 TPE-E ″ ″ ″ 0 1.8 PP - 1.2 — polyester ester 41 TPE-E ″ ″ ″ 0 0 Adflex - 5 — polyester ester 42 TPE-E ″ ″ ″ 0 1.5 PP - 1.2 Ca Stearate polyester ester PBT - 5 0.1 43 TPE-E ″ ″ ″ 0 0 PBT - 5 Ca Stearate polyester ester 0.1 44 EPDM Monteil Adflex Q100F 0 0 PP - 20 — TPV 45 EPDM ″ ″ ″ 3.5 1.8 PP - 24.7 — TPV 46 EPDM ″ ″ ″ 0 3 PP - 30 — TPV 47 EPDM ″ ″ ″ 0 3 PP - 34.7 — TPV 48 EPDM ″ ″ ″ 0 3 PP - 40 — TPV PROCESSING PROPERTIES UTILITY FACTORS CONDITIONS Break Elongation Tape Draw Strength to DIMENSIONS Flex Ex. Melt Temp Draw in Break Elastic Width Thick Gentleness Twist Hardness No. Temp ° C. ° C. Ratio Newtons (%) Limit Decitex (mm) (mm) Perception Index Shore D 29 240 140 4.3:1 23 25 7 1800 1.95 0.096 7 3 33 30 240 115 6:1 27 11 5 1050 1.47 0.071 7 3 33 31 240 140 5.6:1 26 17 5 1216 1.45 0.071 7 3 33 32 240 145 5.9:1 28 145 5 1220 1.55 0.074 7 3 33 33 235 150 4.5:1 18 12 4 1090 1.44 0.067 7 3 33 34 235 150 4.7:1 17 11 4 1130 1.50 0.068 7 3 33 35 235 150 4.6:1 18 10 7 961 1.35 0.065 7 3 33 36 235 150 4.6:1 14 30 10 965 1.24 0.073 7 3 33 37 235 150 4.6:1 20 12 5 1018 1.39 0.069 7 3 33 38 240 150 6.6:1 32 12 8 1300 1.49 0.070 7.5 3.5 31 39 230 150 5.6:1 26 15 8 1090 1.40 0.070 7.5 3.5 31 40 240 150 6.3:1 29 16 8 1150 1.46 0.070 7.5 3.5 31 41 230 140 5.6:1 30 16 10 1233 1.48 0.069 7.5 3.5 31 42 230 145 5.7:1 22 19 10 1108 1.53 0.067 7.5 3.5 31 43 230 245 5.3:1 24 14 8 1143 1.48 0.064 7.5 3.5 31 44 240 130 4.5:1 26 20 0 910 1.60 0.064 5.5 NT NT 45 240 130 4.5:1 25 24 0 940 1.59 0.064 5.5 NT NT 46 240 130 4.7:1 28 20 0 870 1.58 0.064 5.5 NT NT 47 240 130 4.7:1 27 23 0 880 1.58 0.060 5.5 NT NT 48 240 130 4.7:1 35 18 0 720 1.44 0.063 5 NT NT

TABLE 6 Examples of Suitable Monofilament Dental Tapes TAPE COMPOSITION Secondary Thermoplastic Silicone Polymer Other Add'n Ex. Elastomer Trade Process TiO₂ added Type No. Type Manufacturer Name Grade Aid (%) (%) Type (%) (%) 49 PEBA Atofina PEBAX 55133 0 1.8 PP - 1.2 — polyester amide 50 PEBA ″ ″ ″ 3.5 1.8 PP - 4.7 — polyester amide EMA - 3 51 PEBA ″ ″ ″ 3.5 1.8 PP - 4.7 — polyester amide 52 PEBA Atofina PEBAX 63/33 3.5 1.8 PP - 4.7 — EMA - 3 53 ″ ″ ″ ″ 0 0 Nylon 11 - 5 PDVF - 3 54 TPE - E DSM Arnitel PM581 3 0 0 — polyether ester 55 TPE - E DSM Arnitel EM550 3 0 0 — polyether ester 56 TPE - E ″ ″ ″ 3 1.8 PP - 1.2 — polyether ester EMA - 3 57 TPE - E DSM Arnitel UM552 3 1.8 PP - 1.2 — polyether ester PROCESSING PROPERTIES UTILITY FACTORS CONDITIONS Break Elongation Tape Draw Strength to DIMENSIONS Flex Ex. Melt Temp Draw in Break Elastic Width Thick Gentleness Twist Hardness No. Temp ° C. ° C. Ratio Newtons (%) Limit Decitex (mm) (mm) Perception Index Shore D 49 260 130 6.8:1 28 24 0 775 1.30 0.063 6 4 37 50 260 130 7:1 28 30 3 750 1.30 0.063 8 4 37 51 260 130 6.8:1 29 24 0 800 1.35 0.070 6 4 37 52 260 135 6.5:1 31 20 3 800 1.40 0.065 5.5 4 36 53 260 135 6.2:1 28 14 0 800 1.30 0.065 5.5 4 36 54 235 140 5:1 22 16 7 1400 1.60 0.079 7 3 33 55 240 140 6:1 25 20 7 800 1.30 0.060 7 3 33 56 240 140 6:1 27 15 5 850 1.35 0.065 7 3 33 57 240 150 6:1 27 17 10 1100 1.47 0.069 7.5 3 33

TABLE 7 Examples of Suitable Monofilament Dental Tapes TAPE COMPOSITION Secondary Thermoplastic Silicone Polymer Other Add'n Ex. Elastomer Trade Process TiO₂ added Type No. Type Manufacturer Name Grade Aid (%) (%) Type (%) (%) 58 Styrenics Alphagary Evoprene G978 0 1.8 PP - 1.2 — SEBS 59 Styrenics ″ ″ ″ 3 1.8 PP - 1.2 — SEBS 60 Styrenics ″ ″ ″ 0 1.8 PP - 1.2 — SEBS EMA - 3 61 Styrenics ″ ″ ″ 3.5 1.8 PP - 9.7 — SEBS 62 Styrenics ″ ″ ″ 3.5 1.8 PP - 9.7 — SEBS PS - 5 63 TPU Dow Pelethane 2103 0 1.8 PP - 1.2 — 90 AEN 64 TPU ″ ″ ″ 3 1.8 PP - 1.2 — 90 AEN 65 TPU ″ ″ ″ 0 1.8 PP - 1.2 — 90 AEN EMA - 3 66 TPU ″ ″ ″ 3.5 1.8 PP - 9.7 — 90 AEN 67 TPV DSM Sarlink 4149D 0 1.8 PP - 1.2 — 68 ″ ″ ″ ″ 3 1.8 PP - 1.2 — 69 ″ ″ ″ ″ 0 1.8 PP - 1.2 — EMA - 3 70 ″ ″ ″ ″ 3 1.8 PP - 6.2 — PROCESSING PROPERTIES UTILITY FACTORS CONDITIONS Break Elongation Tape Draw Strength to DIMENSIONS Flex Ex. Melt Temp Draw in Break Elastic Width Thick Gentleness Twist Hardness No. Temp ° C. ° C. Ratio Newtons (%) Limit Decitex (mm) (mm) Perception Index Shore D 58 200 100 7:1 19 30 10 1100 1.30 0.060 6 4 37 59 200 100 7:1 20 35 12 1100 1.30 0.060 6 4 37 60 200 100 7.2:1 17 32 12 1100 1.30 0.060 6 4 37 61 200 100 7:1 14 20 7 1100 1.30 0.060 8 4 37 62 200 100 7:1 22 28 8 1100 1.30 0.060 6 4 37 63 230 120 7:1 32 15 5 1200 1.40 0.068 7 3 33 64 230 120 6:1 30 17 6 1200 1.40 0.068 7 3 33 65 230 120 6:1 26 16 6 1200 1.40 0.068 7 3 33 66 230 120 5:1 22 10 2 1300 1.45 0.070 7 3 33 67 220 105 4.5:1 20 20 5 1400 1.45 0.072 6 4 37 68 220 105 5:1 22 35 7 1300 1.40 0.070 6 4 37 69 220 105 4.8:1 19 20 5 1350 1.48 0.075 6 4 37 70 220 105 4.2:1 15 20 5 1450 1.48 0.075 6 4 37

Suitable crystal-free, substantially flake-free, base coatings for various monofilament dental tapes are described in Examples 71 through 88 in Table 8 below:

TABLE 8 Suitable Crystal-Free, Flake-Free Base Coatings for Monofilament Dental Tapes EXAMPLE Ingredient 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 Ultramulsion 10-2.5 57.1 54.8 52.3 50.8 50.8 50.8 58.8 60.8 60.1 55.1 51.1 60.1 61.1 61.1 53.1 57.1 POLOXAMER 407 60.1 60.1 Emsorb 2726 12.5 7.5 12.5 9 5 3 3 0 3 3 3 3 3 3 4 3 3 3 Stearyl Alcohol 9.2 10.5 8 7 11 13 15 16 15 15 15 15 15 15 10 8 15 15 Insoluble Saccharin 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 Propyl gallate 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Spicemint Flavor 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 Vanilla Mint Flavor 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 Tetrasodiumpyro- 8 14 14 10 10 10 10 10 10 10 14 4 6 6 10 6 phosphate Dicalcium 10 phosphate Microcrystalline 10 10 10 0 0 0 0 5 5 0 7 10 7 7 Wax ML 445 Triclosan 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 PEG 8000 11 6 Need heat to wind y n y y n y y y y y y y y y y y y Bobbin tack 1 5 5 3 4 4 3 2 4 4 3 3 4 3 4 4 (1 = poor, 5 = good) Flake resistance Feels sticky (1 = no, 5 4 4 2 1 2 2 3 3 3 1 4 3 4 4 5 = very) Load of two 29/ Na Na 43/ 28/ 53/ 58/ 33/ 51/ 33 46/ 40/ 38/ 50/ 48 45 38/ 43/ samples 19 50 11 39 43 20 40 53 39 38 37 39 39 Release Value 98 97 100 96 100 99 100 100 96 99 98 100 97 99 100 96 100 100

TABLE 9 Coated Monofilament Dental Tapes with an Overcoating of Particulate Abrasive Monofilament Particulate Dental Tape Abrasive Incidental Release Example Composition Base Coating Overcoating Factor (IRF) Perceived Abrasive No. per example # (mg/yd) (mg/yd) (in %) Factor (PAF) Comments 89 Example 13 (680) 45 pumice (20) 95 3.5 Suitable for professional use only product 90 Example 14 (730) 47 granular DCP (14) 90 2.0 Tartar control product 91 Example 13 (745) 52 alumina DCP (22) 87 3.7 Suitable for whitening/stain removal product

TABLE 10 Wax Coated Monofilament Dental Tape Overcoated with Particulate Abrasive and Saliva Soluble Particulate OVERCOATINGS Monofilament Wax Particulate Saliva Soluble Dental Tape Base Coating Abrasive Type & Particulate Type Ex. Composition per Type & Load Load Projected Projected & Load Impact of Saliva No. Example No. (mg/yd) (in mg/yd) PAF IRF (in mg/yd) Soluble Particulate 92 Example 13 microcrystalline pumice 3.4 96 PEG 3350/flavor — wax (21) (14) (33) 93 Example 14 microcrystalline pumice 3.2 98 PEG 3350/flavor — wax (14) (18) (33) 94 Example 13 microcrystalline silica 2.8 97 PEG 3350/flavor — wax (16) (12) (33) 95 Example 14 bees wax pumice 3.5 92 PEG 3350/flavor — (27) (22) (14) 96 Example 13 bees wax pumice 3.0 96 PEG 3350/flavor — (27) (14) (17)

TABLE 11 Suitable Wax Coatings for Various Monofilament Dental Tapes Estimated % of total Monofilament particulate abrasive Tape Imbedded Particulate surface area Ex. Composition per Wax Base Coating Abrasive-Type Projected IRF Projected PAF imbedded into wax No. Example No. Type (mg/yd) (mg/yd) (in %) (in %) coating 97 Example 13 microcrystalline wax pumice 92 3.6 17 to 24 (28) (20) 98 Example 13 microcrystalline wax pumice 98 3.2 13 to 16 (34) (12) 99 Example 14 microcrystalline wax pumice 96 3.4 15 to 18 (34) (16) 100 Example 14 microcrystalline wax Silica 98 2.8 19 to 26 (34) (15) 101 Example 13 microcrystalline wax Silica 99 2.5 15 to 18 (34) (9) 102 Example 14 Bees wax Pumice 94 3.5 16 to 25 (24) (20) 103 Example 13 Bees wax Pumice 97 3.1 12 to 16 (24) (11) 104 Example 14 Bees wax Silica 98 2.5 18 to 20 (24) (16) 105 Example 13 PEG 3350 Pumice 90 3.7 18 to 26 (30) (21) 106 Example 13 PEG 3350 Pumice 95 3.2 13 to 18 (30) (13) 107 Example 14 PEG 3350 Pumice 98 2.9 10 to 13 (30) (9) 108 Example 14 Bees wax Pumice 94 3.6 16 to 23 (27) (18)

In addition to various types of fluidized beds, the particulate abrasive overcoatings can be introduced onto the coated monofilament dental tapes by several other means for impinging particulate abrasives onto coated tapes. These include various powder coating processes including fluidized bed, plastic frame-spraying, electrostatic spraying and sonic spraying. In the latter, sound waves are used to suspend the particulate abrasives. Some of these other particulate abrasive overcoating processes are described in U.S. Pat. Nos. 6,037,019; 3,848,363; 3,892,908; 4,024,295; 4,612,242; 5,163,975; 5,232,775; 5,273,782; 55,389,434; 5,658,510; 2,640,002; 3,093,501; 2,689,808; 2,640,001 and 5,194,297, which are incorporated herein by reference.

Particularly preferred particulate abrasive overcoating means include various Nordson® automatic powder coating systems such as the Nordson® Tribomatic II powder coating system, which includes various Nordson® powder pumps, as well as ITW Genca Powder coating systems including their Easysystem™ and Electrostatic Equipment Co's 7R FLEXICOAT® system.

The present invention has been described in detail, including the preferred embodiments thereof However, it will be appreciated that those skilled in the art, upon consideration of the present disclosure, may make modifications and/or improvements on this invention and still be within the scope and spirit of this invention as set forth in the following claims.

Claims

1. (canceled)

2. A method for removing, disrupting and controlling biofilms comprising the step of flossing interproximal and subgingival areas with monofilament dental tape including two coatings,

a saliva soluble base coating; and

a particulate abrasive overcoating;

wherein said base coating and particulate abrasive overcoating are released during flossing and cooperate with said monofilament dental tape to remove, disrupt and control biofilms.

3. A method for overcoating coated monofilament dental devices with particulate abrasive comprising the steps of:

(a) impinging particulate abrasive onto heated liquid base, substantive coatings contained on said monofilament dental devices and;

(b) subsequently passing said particulate overcoated, coated monofilament dental devices through a cooling zone, whereby said base coating solidifies entrapping said particulate abrasive onto said base coating.

4. Coated monofilament dental devices, overcoated with biofilm-responsive, releasable, particulate abrasives and saliva soluble particulates, wherein:

said monofilament dental device is selected from the group consisting of PTFE, polyethylene, polypropylene and elastomeric monofilament devices;

coatings for said monofilament dental devices are selected from saliva soluble emulsion and crystal-free coatings; and

said particulate abrasives are selected from the group consisting of organic, inorganic, dental and active abrasives and mixtures thereof.

5. (canceled)

6. (canceled)

7. (canceled)

8. (canceled)

9. (canceled)

10. (canceled)

11. (canceled)

12. Coated monofilament dental devices according to claim 4, wherein said monofilament dental device comprises polyethylene.

13. A method for removing, disrupting and controlling biofilms comprising the step of flossing interproximal and subgingival areas with particulate abrasive, overcoated monofilament dental device containing a saliva soluble base coating, wherein said base coating is imbedded with a particulate abrasive overcoating that functions as a soft abrasive oral sandpaper during flossing to remove, disrupt and control biofilms.

14. (canceled)

15. A method for overcoating coated monofilament dental tape with particulate abrasives comprising the steps of:

(a) impinging particulate abrasives onto a heated liquid base coating substantive to said monofilament followed by;

(b) impinging saliva soluble particulates onto said heated liquid base coating,

(c) subsequently passing said imbedded particulate overcoated, coated monofilament dental tape through a cooling zone, whereby said base coating solidifies entrapping said particulates into said base coating and

(d) passing said particulate overcoated, coated monofilament dental tape through an imbedded particulate overcoating compression means.

16. Coated, texturized, monofilament dental devices having a denier between about 300 and about 1000 containing from between about 10 and about 100 mg/yd of saliva soluble emulsion base coating and having a biofilm-responsive particulate overcoating imbedded therein, wherein:

said particulate abrasive coating comprises from between about 2 and about 45 percent by weight of said device; and

said particulate abrasive coating has a Incidental Release Factor (IRF) of at least about 85 percent by weight.

17. Coated monofilament dental devices according to claim 16, wherein said emulsion base coating is an emulsion of polydimethylsiloxane and block copolymers of ethylene oxide and propylene oxide.

18. Coated monofilament dental devices according to claim 17, wherein said biofilm-responsive particulate overcoating contains a whitening substance.

19. Coated monofilament dental devices according to claim 16, wherein said base coating and said particulate overcoating each contain a tartar control substance.

20. Coated monofilament dental devices according to claim 4, wherein said coating is an insoluble wax coating, said particulate abrasive is an active abrasive, and said saliva particulate is an emulsion of polydimethylsiloxane and block copolymers of ethylene oxide and propylene oxide.

21. The method of claim 15, wherein excess particulate abrasive is collected and recycled using a vacuum cyclone recovery means.