Patents Assigned to Pentron Clinical Technologies, LLC
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Publication number: 20100152019Abstract: A filler for a dental resin composition is disclosed, comprising silica particles derived from a nanoparticulate silica sol, the filler material having at least one crystalline phase. The filler material provides improved wear resistance and other properties.Type: ApplicationFiled: February 1, 2010Publication date: June 17, 2010Applicant: PENTRON CLINICAL TECHNOLOGIES, LLCInventors: Jia Weitao, Jin Shuhua
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Patent number: 7700667Abstract: A composition is disclosed comprising a polymerizable (meth)acrylate of the structure: wherein A is an anhydride; a is 0 or 1; n is 0, 1, 2, or 3; R1, R2, R3, and R4 are each independently hydrogen, hydroxy, C1-C12 alkyl, C1-C12 perhaloalkyl, C1-C12 alkoxy, C1-C12 perhaloalkoxy, C2-C12 alkenyl, C2-C12 alkynyl, (C1-C6 alkyl)-O-(C1-C6 alkylene), or hydroxy(C1-C6 alkylene); x and y are each independently an integer of 1 to 10; z is an integer of 1 to 5; R5 is hydrogen or methyl; M is wherein G and J are each independently O or NR6, wherein R6 is hydrogen or C1-C6 alkyl; m is 1, 2, 3, or 4; W is an organic group having the valency of z+1; and q is 0 or 1; and further wherein when a is 1, n+m+q is 1, 2, 3, or 4, and when a is 0, n+m+q is 1, 2, 3, 4, 5, or 6. The composition finds use as a dental resin.Type: GrantFiled: January 28, 2005Date of Patent: April 20, 2010Assignee: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Shuhua Jin
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Patent number: 7670580Abstract: A filler for a dental resin composition is disclosed, comprising silica particles derived from a nanoparticulate silica sol, the filler material having at least one crystalline phase. The filler material provides improved wear resistance and other properties.Type: GrantFiled: October 10, 2003Date of Patent: March 2, 2010Assignee: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Shuhua Jin
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Patent number: 7632877Abstract: A low shrinkage, polymerizable oligomer comprises units of the structure: AB??(I) wherein A is an organic radical comprising 1 to about 6 (meth)acrylate groups and 0 to about 5 hydroxy groups; B is an organic radical comprising 1 to about 5 epoxide groups, and wherein A and B are linked through the reaction of an epoxide and a hydroxy group. In one embodiment, a dental restorative material comprises the low shrinkage, polymerizable dental oligomer, a filler system, and a curing system. These polymerizable dental resins may be used for a variety of dental materials, treatments, and restorative functions, including crown and bridge materials, fillings, adhesives, sealants, luting agents or cements, denture base materials, orthodontic materials and sealants, and other dental restorative materials.Type: GrantFiled: April 5, 2007Date of Patent: December 15, 2009Assignee: Pentron Clinical Technologies LLCInventors: Shuhua Jin, Weitao Jia
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Publication number: 20090246738Abstract: A fiber-reinforced composite post having an inner core section or rod fabricated of fibers impregnated in a resin matrix and an out sheath of fibers arranged in the form of a mesh. The sheath comprises an interior and an exterior surface, whereby the interior surface is attached to and embedded in the resin matrix of the rod and the exterior surface has dry, unimpregnated fibers.Type: ApplicationFiled: March 25, 2008Publication date: October 1, 2009Applicant: Pentron Clinical Technologies, LLCInventor: Ajit Karmaker
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Patent number: 7589132Abstract: A dental restorative composition comprises a resin composition comprising a low shrinkage, polymerizable oligomer contains units of the structure: AB??(I) wherein A is an organic radical having 1 to about 6 (meth)acrylate groups and 0 to about 5 hydroxy groups; B is an organic radical having 1 to about 5 epoxide groups, and wherein A and B are linked through the reaction of an epoxide and a hydroxy group; and a filler composition comprising a polyhedral silsequioxane and a sol-derived filler. These polymerizable dental composites may be used for a variety of dental materials, treatments, and restorative functions, including crown and bridge materials, fillings, adhesives, sealants, luting agents or cements, denture base materials, orthodontic materials and sealants, and other dental restorative materials.Type: GrantFiled: June 13, 2005Date of Patent: September 15, 2009Assignee: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Shuhua Jin
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Patent number: 7488175Abstract: A dental post comprising a rod fabricated of fiber-reinforced composite material. The rod comprises a plurality of frustoconical sections arranged coaxially along the longitudinal axis of the rod. Preferably the rod has consistent width along the longitudinal axis wherein the frustoconical sections each have the same tapered width and same length. The number of frustoconical units per rod can vary. The frustoconical sections may vary in shape. Moreover, the rod may include a channel therein extending along the longitudinal axis thereof. The rod may also include one or more grooves extending along the surface thereof.Type: GrantFiled: December 6, 2004Date of Patent: February 10, 2009Assignee: Pentron Clinical Technologies, LLCInventors: Ajit Karmaker, Arun Prasad
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Patent number: 7470728Abstract: A polymerizable dental glaze, comprising: a polymerizable, ethylenically unsaturated resin composition; a filler composition consisting essentially of a polyhedral oligomeric silsesquioxane filler; and a curing system. These polymerizable dental glazes may be used for temporary or permanent dental restorations.Type: GrantFiled: November 29, 2005Date of Patent: December 30, 2008Assignee: Pentron Clinical Technologies LLCInventors: Weitao Jia, Shuhua Jin
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Publication number: 20080250974Abstract: A dental material comprising a symmetrically rod-shaped fiber-reinforced composite comprising at least two layers of preimpregnated fibers, wherein the preimpregnated fibers comprise fibers coated with a resin, wherein the layers are unbraided, and wherein each layer is unidirectionally disposed on the preceding layer in a direction that is different from the direction of the preceding layer. The rod-shaped composite may be hollow and contain a channel throughout the axial length of the rod or may contain a shaft or other material that is inserted into the channel.Type: ApplicationFiled: April 12, 2007Publication date: October 16, 2008Applicant: Pentron Clinical Technologies, LLCInventor: Weitao Jia
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Patent number: 7331789Abstract: Dental posts and obturators are manufactured herein having a filling material applied to the apical end of the post and obturator such that the adherence strength between the filling material and the post or obturator is very high. The filling material is adhered to the post and obturator by applying one or more corona or plasma treatments to the surface of the post and obturator and thereafter applying the filling material to the surface-treated post and obturator. The surfaces of the post and obturator are modified by the corona or plasma treatments to create a highly adherent surface for the application of the filling material thereto. Dental restorations are manufactured herein wherein a veneer is applied to a dental substructure and the adherence strength of the veneer to the dental substructure is very high.Type: GrantFiled: February 6, 2004Date of Patent: February 19, 2008Assignee: Pentron Clinical Technologies, LLCInventors: Ajit Karmaker, Arun Prasad
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Publication number: 20080020353Abstract: A dental filling material comprising an inner core and outer layer of material disposed and surrounding the inner core, both the inner core and outer layer of material each containing a thermoplastic polymer. The thermoplastic polymer may be biodegradable. A bioactive substance may also be included in the filling material. The thermoplastic polymer acts as a matrix for the bioactive substance. The composition may include other polymeric resins, fillers, plasticizers and other additives typically used in dental materials. The filling material is used for the filing of root canals.Type: ApplicationFiled: September 19, 2007Publication date: January 24, 2008Applicant: Pentron Clinical Technologies, LLCInventor: Weitao Jia
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Patent number: 7275933Abstract: Method of manufacturing dental restorations using curable compositions including degradable macromonomers having one or more terminal acrylate or methacrylate functionality, a curing composition, a filler composition including bioactive particles of bioactive glass, bioactive glass-ceramics, calcium phosphates, calcium apatites, or mixtures thereof and optionally one or more polymerizable acrylate or methacrylate comonomers. Degradable macromonomers are manufactured from cyclic monomers with compounds having acrylate or methacrylate functionality. Depending on their use, the degradable macromonomer compositions further include one or more organic or inorganic fillers, including a calcium-based compound and/or a radiopacity-imparting agent. The compositions are particularly suitable for root canal sealants, implants, bone cements, and pulp capping materials.Type: GrantFiled: June 4, 2004Date of Patent: October 2, 2007Assignee: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Shuhua Jin
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Patent number: 7275932Abstract: A two-part self-curing endodontic sealing system comprises a thiourea derivative, such as acetyl thiourea, and a hydroperoxide, such as cumene hydroperoxide. The thiourea derivative is used as a reducing agent and the hydroperoxide is used as an oxidizing agent.Type: GrantFiled: September 20, 2002Date of Patent: October 2, 2007Assignee: Pentron Clinical Technologies, LLCInventors: Shuhua Jin, Weitao Jia
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Patent number: 7252508Abstract: An endodontic obturator comprising a shaft section and a filler section fabricated of the same material and formed as a single unit. A handle section may be included and may be formed integrally with the shaft section and filler section as a single unit, or may be fabricated separately and attached to the single unit containing the shaft section and the filler section. An endodontic post is provided having a post section and a filler section fabricated of the same matrix material to provide a cohesive bond between the two sections.Type: GrantFiled: December 13, 2002Date of Patent: August 7, 2007Assignee: Pentron Clinical Technologies, LLCInventors: Ajit Karmaker, Arun Prasad
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Publication number: 20070173558Abstract: A low shrinkage, polymerizable oligomer comprises units of the structure: AB ??(I) wherein A is an organic radical comprising 1 to about 6 (meth)acrylate groups and 0 to about 5 hydroxy groups; B is an organic radical comprising 1 to about 5 epoxide groups, and wherein A and B are linked through the reaction of an epoxide and a hydroxy group. In one embodiment, a dental restorative material comprises the low shrinkage, polymerizable dental oligomer, a filler system, and a curing system. These polymerizable dental resins may be used for a variety of dental materials, treatments, and restorative functions, including crown and bridge materials, fillings, adhesives, sealants, luting agents or cements, denture base materials, orthodontic materials and sealants, and other dental restorative materials.Type: ApplicationFiled: April 5, 2007Publication date: July 26, 2007Applicant: PENTRON CLINICAL TECHNOLOGIES, LLCInventors: Shuhua Jin, Weitao Jia
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Patent number: 7241856Abstract: A low shrinkage, polymerizable oligomer comprises units of the structure: AB??(I) wherein A is an organic radical comprising 1 to about 6 (meth)acrylate groups and 0 to about 5 hydroxy groups; B is an organic radical comprising 1 to about 5 epoxide groups, and wherein A and B are linked through the reaction of an epoxide and a hydroxy group. In one embodiment, a dental restorative material comprises the low shrinkage, polymerizable dental oligomer, a filler system, and a curing system. These polymerizable dental resins may be used for a variety of dental materials, treatments, and restorative functions, including crown and bridge materials, fillings, adhesives, sealants, luting agents or cements, denture base materials, orthodontic materials and sealants, and other dental restorative materials.Type: GrantFiled: June 2, 2003Date of Patent: July 10, 2007Assignee: Pentron Clinical Technologies LLCInventors: Shuhua Jin, Weitao Jia
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Publication number: 20070148616Abstract: An endodontic post and obturator comprising a filling material, wherein the filling material comprises a biodegrable thermoplastic polymer. A bioactive substance may also be included in the filling material. The thermoplastic polymer acts as a matrix for the bioactive substance. The composition may include other polymeric resins, fillers, plasticizers and other additives typically used in dental materials.Type: ApplicationFiled: January 16, 2007Publication date: June 28, 2007Applicant: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Bruce Alpert
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Patent number: 7226960Abstract: A self-etching, priming dental adhesive composition comprises an olefinically unsaturated monomer having an —SO3 functionality; a copolymerizable multi-functional (meth)acrylate adhesive; and a curing system. The self-etching, priming dental adhesive may further comprise a copolymerizable adhesion promoter containing an acid functionality, the adhesion promoter being different from the olefinically unsaturated monomer having an —SO3 functionality and the copolymerizable multi-functional (meth)acrylate adhesive, and a solvent system in an amount effective to dissolve the adhesive and/or the adhesion promoter. The adhesive composition provides even further advantages over the art, as all etching, priming, and application of an adhesive can be performed in one step.Type: GrantFiled: May 21, 2003Date of Patent: June 5, 2007Assignee: Pentron Clinical Technologies, LLCInventor: Weitao Jia
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Patent number: 7211136Abstract: A dental filling material comprising a thermoplastic polymer. The thermoplastic polymer may be biodegradable. A bioactive substance may also be included in the filling material. The thermoplastic polymer acts as a matrix for the bioactive substance. The composition may include other polymeric resins, fillers, plasticizers and other additives typically used in dental materials. The filling material is used for the filing of root canals.Type: GrantFiled: June 18, 2003Date of Patent: May 1, 2007Assignee: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Martin Trope, Bruce Alpert
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Patent number: 7204874Abstract: An endodontic filling material comprising a biodegrable thermoplastic polymer. A bioactive substance may also be included in the filling material. The thermoplastic polymer acts as a matrix for the bioactive substance. The composition may include other polymeric resins, fillers, plasticizers and other additives typically used in dental materials. The filling material is used for the filing of root canals.Type: GrantFiled: October 24, 2002Date of Patent: April 17, 2007Assignee: Pentron Clinical Technologies, LLCInventors: Weitao Jia, Bruce Alpert