Abstract: The film holder for dental technique comprises a bite portion (4) and an approximately U-shaped film clip (5) including an oral (6) and a facial (7) plate. For a safe retention also of thin digital picture plates or of films and picture plates having an uneven topography without damaging their sensitive surfaces, the facial plate (7) is provided with means allowing to obtain a pressure distribution adapted to different thicknesses and/or topographies of films or digital picture plates.

Abstract: The interdental wedge is particularly intended for use in the insertion of approximal fillings of light-curing synthetic materials and consists of a combination of a wedge body and an underlying compressible sole comprising a rim which projects on both sides of the wedge body. The sole portion is preferably made of a thermoplastic elastomer and the wedge body of a translucent synthetic material. A wedge of this kind provides a strong spreading force, and the two rims are deformed when inserted, thereby ensuring a firm retention and a tight application of the matrix to the dental anatomy, and they form sealing lips in order to keep away the saliva from the treated area and to gently displace the papilla.

Abstract: The film holder for dental technique comprises a bite portion (4) and an approximately U-shaped film clip (5) including an oral (6) and a facial (7) plate. For a safe retention also of thin digital picture plates or of films and picture plates having an uneven topography without damaging their sensitive surfaces, the facial plate (7) is provided with means allowing to obtain a pressure distribution adapted to different thicknesses and/or topographies of films or digital picture plates.

Abstract: Instead of a bunch of bristles coated with abrasive particles, the brush for surface treatments in restorative dentistry comprises one or several lamellar abrasive elements. In the manner of a lametta strip, the abrasive elements are divided by at least one incision, such that a plurality of bristle portions is obtained. Due to the planar configuration of the bristle portions themselves, the latter are easily bendable in at least one direction. If the arrangement of the abrasive elements is such that this direction of easy bending ability is approximately tangential to the intended rotational direction of the brush, the overall flexibility of the brush is substantially increased, thus allowing a substantially improved compliance with application-specific requirements.

Abstract: The sharpening device for dental instruments comprises a chuck head holder having an arcuate member to one end of which the chuck head with the chuck is radially attached while the arcuate member is guided in a base of the device. The grinding head with the grinding wheel comprises a grinding head bearing which is rotatable around the mid-perpendicular of the base and includes a pivot which extends in parallel to the surface of the base and on which the grinding head turns, the latter being under the action of a tension spring in such a manner that the grinding wheel surface, which is disposed at an angle with respect to the mid-perpendicular, is pressed against the surface to be treated of the instrument. Moreover, the chucking assembly allows an essentially improved chucking of the instrument due to a thrust bolt which is actuated by an eccentric member and presses the shank of the instrument against the chuck opening. The head of the thrust bolt may be movable in order to adapt to the shape of the shank.

Abstract: The adhesion of dental restorative materials, more particularly of composite materials containing an organic binder, to dental instruments can be reduced, essentially independently of the material of which the dental instrument is made, by providing the working surfaces with impressions. These impressions result in a reduction of the contact surface of the composite material on the working surface and thus in a reduction of the component of the adhesion which is due to physical attraction, e.g. to the van der Waals force. If the impressions are sufficiently small, a penetration of the composite material into the impressions is prevented by the high viscosity of the latter alone. If additionally the impressions are capable of being sealed by the tooth replacement material in contact therewith, an air cushion forms in the impressions which additionally counteracts a penetration of the tooth replacement material.

Abstract: The dental device comprises an abrasive disk having a hub made of synthetic material and a spindle with a collet, the opening of the hub having an inner bead and the collet a rotation lock and an axial lock for receiving said bead in the hub opening, the greatest diameter of the spindle with its rotation lock being greater than the diameter of the hub opening with its bead. This construction allows, on one hand, an easier mounting of the abrasive disk on the spindle, and, on the other hand, a high torque transmission.

Abstract: The method for joining a metal foil with a synthetic material foil comprises unwinding both materials from a supply roll each, and subjecting the synthetics foil, prior to the application of an adhesive, to a corona discharge on a narrow border region. The metal foil and the synthetic material foil are then pressed together and irradiated by ultraviolet radiation causing polymerization of the adhesive. The composite foil material thus obtained is transferred to a further processing station. There the dental matrix can be punched out of such a composite sheet material, having a high tensile strength, whose metal portion can easily be inserted between two adjacent teeth whereas the transparent synthetic material part allows light curing of the dental filling material.

Abstract: The cup to be used as a paste carrier for dental hygienic consists of a rubber elastic material and can be driven for rotation by a hand piece. The cup comprises a paste receiving part, the inner side enlarging towards its open edge as well as the outer side of the cup enlarging towards its open edge comprising spiraled ribs which are running in the opposite direction to the rotational direction of the hand piece. The structure on the inner side of the paste receiving part allows a continuous supply of paste and a cooling of the cup, and the structure of the outer side of the cup prevents a bale formation of the mucous and guarantees an effective cooling of the cup.

Abstract: The interdental wedge for the use during the insertion of approximal fillings of light curing synthetic material comprises the combination of a sole portion having disposed thereon an insert of a light conducting synthetic material and a light conducting element, such as a light reflector, to conduct the light necessary for curing and coming from the front surface of the wedge on the filling. The sole portion consists of a material which is compressible and requires strongly increasing forces for further compression; thus, the wedge can snugly fit to the approximal contour of the tooth to be treated and exert sufficiently high separation forces. Preferably, the material of the sole portion is wood whose fibers are preferably aligned in lengthwise direction of the wedge, and/or a synthetic material having included therein compressible filler particles. Thermoplastics and thermoplastic elastomers are preferred synthetic materials.

Abstract: A dental matrix tensioner has a casing containing a pin rotatable relative to the casing, the pin having a slot therein for releasably receiving a dental matrix and for tightening the matrix about a tooth upon rotation of the pin relative to the casing. A device to rotate the pin relative to the casing comprises an elongated assembly, and a member slidable lengthwise of the assembly in one direction to grip external portions of the casing and in an opposite direction to release those external portions of casing thereby selectively releasably to retain the rotating device in assembled relation with the casing. The lengthwise slidable member is also rotatable and is selectively engageable with the pin to rotate the pin upon rotation of the slidable member. The slidable and rotatable member has a noncircular end which fits removably in a noncircular recess in the pin whereupon when that end is inserted in the noncircular recess and sliding member is rotated, the pin is turned relative to the casing.

Abstract: The toothpaste proposed contains as an abrasive, preferably as the sold abrasive, expanded perlite, generally with a particle size in the range of 1 to 150 .mu.m, in particular with a main fraction in the region of 20 .mu.m. This gives enhanced cleaning power, and improved protection of the tooth enamel against wear and scratching.

Abstract: In a tensioning gripper with a ring and a coaxially arranged rotary pin, both the ring and the pin are provided with a slot suitable for receiving a matrix to be tensioned. The slot of the rotary pin has a symmetry plane parallel to the longitudinal axis of the rotary pin. The sides of the slot are composed by two angled portions which are arranged symmetrically on both sides of the symmetry plane and both portions converge towards the longitudinal axis of the rotary pin, the two vertices of the portions being opposite and adjacent one another. Such a slot allows easy introduction and gripping of the matrix until, by rotating the pin, the matrix is held and tensioned.

Abstract: A flexible spindle suitable for transmitting a torque as well as an axial thrust is constituted by a plurality of helical spirals of wire all of the same length. Each spiral has opposite winding directions to the winding direction of the adjacent spirals and the outer diameter of each spiral is equal to the inner diameter of the spiral which surrounds it. The terminal ends of the spirals are assembled integrally with each other and with the terminal ends of a flexible member situated inside the innermost spiral. Each sprial has a length which is equal to that of the other spirals as measured along their axis when these are in their bent operating position and under those conditions under which they are designed to transmit torque and thrust, with the flexible spindle resulting not to be radially or longitudinally deformable when under stress, thus transmitting the forces without loss.

Abstract: A device for obtaining the fitting of a matrix to a tooth to be filled comprises matrix (5) and wedge (4) or its attachment part (7) made of resin "with memory that is deformable by illumination". The device is made such that when it is illuminated it deforms and pushes matrix (5) to precisely occupy the radicular recess of the tooth to be filled, while when it is not illuminated it again assumes its normal shape. Thus, one obtains a perfect filling that perfectly fits the shape of the tooth.

Abstract: The ablator is made with synthetic resins reinforced so as to resist the mechanical stresses of flexion and abrasion. The resins are reinforced with metallic or non-metallic fibers totally incorporated in them, and are reinforced against wear due to abrasion by a modification in their surface molecular structure by means of a process of ionic implantation or similar procedures. Preferably, the synthetic resins used belong to the group of polyarylamides which exhibit better characteristics of mechanical resistance and of the duration of the sharpened edge of the ablator.

Abstract: The dental care and cleaning composition is a water-free paste containing at least 40% by weight of perlite as a sole and combined cleaning and polishing body, a stabilizer for the perlite in the sense of a controlled particle disintegration during use, a wettening agent for the perlite and at least 40% by weight of propylene glycolThe use for the cleaning of teeth yields successively a cleaning and a polishing effect.

Abstract: A dental device includes an angular matrix (1), with a shape reproducing the shape of the zone of a tooth (3) on which an operation is performed. The matrix (1) is made of synthetic material transparent to light radiations used for photopolymerization of composite resins. Forceps (2), also similarly transparent, have ends (2',2") which, with the forceps (2) locked, form with their inside surfaces (2"',2.sup.IV) a shape also substantially equal to that of the tooth (3). The matrices can be right or left and modeled for large incisors, small incisors or canine teeth. During the operation, the matrix (1) is kept in position simply by the lateral thrust exerted by the forceps (2) on a flap (1") extended along the contour of the matrix (1) and located substantially perpendicular to the matrix (1) itself.