# US 5,707,231 A · Orthodontic assembly with reinforcement structure > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,231 A - Document ID: US5707231A - Status: Granted - Kind: A - Application number: 08/280,014 - Filed: 1994-07-25 - Granted: 1998-01-13 - Earliest claimed: 1994-07-25 - Assignees: RMO, Inc. - Inventors: David E. Watt; Walter Schmidt - Web page: https://patentgrep.com/patent/US5707231A ## CPC - A61C 7/14: Brackets (A61C7/28 takes precedence); Fixing brackets to teeth - A61C 7/141: {Brackets with reinforcing structure, e.g. inserts} - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) ## Abstract An orthodontic assembly including an orthodontic appliance and a region composed of a matrix material having a plurality of reinforcement structures distributed throughout, with some of the reinforcement structures being exposed on an exterior surface of the assembly, as well as an associated method of fabrication. In one embodiment, the entire orthodontic appliance is composed of the noted reinforcement structures and matrix material. In another embodiment, the noted region is actually a layer which is attached to a separately formed appliance, such as a bracket. Nonetheless, the reinforcement structures may be exposed in a variety of locations, such as on the base and/or arch slot. Moreover, this region may be formed by forming the appliance from the reinforcement structures and matrix material in a manner which produces skin on its exterior surface, and removing the skin from the desired areas to expose reinforcement structures partially contained within the matrix material. ## Claims ### Claim 1 An orthodontic assembly, comprising: an orthodontic appliance, comprising a first region comprising a matrix material and a plurality of reinforcement structures distributed throughout and suspended within substantially all of said matrix material whereby an amount of matrix material is more than to merely coat/impregnate said plurality of reinforcement structures, wherein said first region has a thickness greater than a largest dimension of each of said reinforcement structures and comprises at least a first surface area, wherein at least a part of at least some of said plurality of reinforcement structures are exposed on and thereby define at least a portion of said first surface area and extend beyond adjacently positioned matrix material to provide discontinuities on said first surface area, said first surface area being at least one of a surface of said orthodontic appliance on which a bonding adhesive is applied to attach said appliance to a tooth of an orthodontic patient and a surface which interfaces with another orthodontic appliance. ### Claim 2 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein said matrix material is selected from the group consisting of plastics, metals, ceramics, and combinations thereof. ### Claim 3 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein said matrix material is a polymer. ### Claim 4 (depends on 3) An orthodontic assembly as claimed in claim 3, wherein said polymer is a polycarbonate. ### Claim 5 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein each said reinforcement structure comprises a first material selected from the group consisting of glass, titanium dioxide, feldspar, silicas, calcium carbonate, talc, micas, calcium silicates, metals, ceramics, and combinations thereof. ### Claim 6 (depends on 5) An orthodontic assembly as claimed in claim 5, wherein said first material consists of said ceramic which is selected from the group consisting of oxygen saturated aluminum oxide, magnesium oxide, silicon oxide, zirconium oxide, and combinations thereof. ### Claim 7 (depends on 6) An orthodontic assembly as claimed in claim 6, wherein said ceramic consists of said oxygen saturated aluminum oxide. ### Claim 8 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein a first portion of said plurality of reinforcement structures are whiskers/fibers and a second portion of said plurality reinforcement structures are generally spherical. ### Claim 9 (depends on 8) An orthodontic assembly as claimed in claim 8, wherein each said whisker/fiber has a diameter ranging from about 3 microns to about 8 microns and a length ranging from about 40 microns to about 60 microns. ### Claim 10 (depends on 8) An orthodontic assembly as claimed in claim 8, wherein said second portion comprises a plurality of said reinforcement structures within a first size range and a plurality of said reinforcement structures within a second size range different from said first size range. ### Claim 11 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein a first portion of said plurality of reinforcement structures each have a dimension greater than about 1 micron. ### Claim 12 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein said plurality of reinforcement structures are each generally spherical. ### Claim 13 (depends on 12) An orthodontic assembly as claimed in claim 12, wherein a first portion of said plurality of reinforcement structures are within a first size range and a second portion of said plurality of reinforcement structures are within a second size range different from said first size range. ### Claim 14 (depends on 13) An orthodontic assembly as claimed in claim 13, wherein said first size range is a diameter ranging from about 20 microns to about 35 microns and said second size range is a diameter ranging from about 1 micron to about 4 microns. ### Claim 15 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein said plurality of reinforcement structures are each whiskers/fibers. ### Claim 16 (depends on 1) An orthodontic assembly as claimed in claim 1, further comprising an interconnecting means for supportably interconnecting said orthodontic appliance to a tooth, wherein said interconnecting means interfaces with said first surface area. ### Claim 17 (depends on 16) An orthodontic assembly as claimed in claim 16, wherein said interconnecting means comprises an adhesive. ### Claim 18 (depends on 1) An orthodontic assembly, as claimed in claim 1, wherein said orthodontic appliance further comprises a base having a bonding surface and wherein said first region is separately attached to said bonding surface of said base, said orthodontic assembly further comprising a bonding adhesive applied to said first surface area whereby said assembly may be attached to a tooth. ### Claim 19 (depends on 1) An orthodontic assembly, as claimed in claim 1, wherein an entirety of said orthodontic appliance is formed from said matrix material and a plurality of said reinforcement structures are distributed throughout substantially all of said matrix material, whereby said orthodontic appliance and said first region are integrally formed. ### Claim 20 (depends on 1) An orthodontic assembly, as claimed in claim 1, wherein said orthodontic appliance comprises an arch slot, said first surface area comprising surfaces of said arch slot which interface with an arch wire. ### Claim 21 (depends on 1) An orthodontic assembly, as claimed in claim 1, wherein said first region consists essentially of said matrix material and said plurality of reinforcement structures. ### Claim 22 (depends on 1) An orthodontic assembly, as claimed in claim 1, wherein said orthodontic appliance comprises an arch slot and said first surface area defines at least a portion of said arch slot, said assembly further comprising an arch wire positioned in said arch slot, whereby said at least a part of at least some of said plurality of reinforcement structures engage said arch wire. ### Claim 23 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein said surface which interfaces with said another orthodontic appliance is an arch slot. ### Claim 24 (depends on 1) An orthodontic assembly as claimed in claim 1, wherein said orthodontic appliance comprises said matrix material and said plurality of reinforcement structures, said first region being integrally formed with said orthodontic appliance, wherein said orthodontic appliance is made by the method of forming a body from said matrix material having said plurality of reinforcement structures distributed substantially uniformly throughout and suspended within substantially all of said matrix material, forming a skin on an entirety of an exterior surface of said body which is a portion of said matrix material which is substantially devoid of said reinforcement structures or which is lean in relation to an amount of said reinforcement structures present in remaining portions of said matrix material, and removing said skin from at least a portion of said body to provide said first surface area. ### Claim 25 An orthodontic assembly, comprising: an orthodontic appliance positionable on a tooth; a base which interfaces with the tooth and an arch slot which receives an arch wire; and a first region having a first surface which defines at least a first part of an exterior surface of said orthodontic assembly, said first region comprising a matrix material and a plurality of reinforcement structures distributed substantially uniformly throughout and suspended within substantially all of said matrix material whereby an amount of said matrix material is more than to merely coat/impregnate said reinforcement structures, wherein a first portion of said plurality of reinforcement structures are substantially totally contained within said matrix material and wherein a second portion of said reinforcement structures are only partially contained within said matrix material whereby parts of said reinforcement structures of said second portion are exposed on said first surface and extend beyond adjacently positioned matrix material to provide discontinuities on said first surface, said first surface comprising at least one of said base and said arch slot. ### Claim 26 (depends on 25) An orthodontic assembly, as claimed in claim 25, wherein: said first region is separately attached to said orthodontic appliance said first surface projecting toward the tooth and comprising said base. ### Claim 27 (depends on 25) An orthodontic assembly, as claimed in claim 25, wherein: said first surface comprises said arch slot. ### Claim 28 (depends on 25) An orthodontic assembly, as claimed in claim 25, wherein: said first region consists essentially of said matrix material and said plurality of reinforcement structures. ### Claim 29 (depends on 25) An orthodontic assembly, as claimed in claim 25, wherein: said orthodontic appliance comprises said matrix material and said plurality of reinforcement structures, said first region being integrally formed with said orthodontic appliance. ### Claim 30 (depends on 25) An orthodontic assembly, as claimed in claim 25, further comprising: a coating on a second part of said exterior surface, said first and second parts defining all of said exterior surface of said orthodontic assembly. ### Claim 31 (depends on 25) An orthodontic assembly, as claimed in claim 25, wherein: said first surface defines both an exterior surface of said base which projects toward the tooth and an exterior surface of said arch slot. ### Claim 32 (depends on 25) An orthodontic assembly as claimed in claim 25, wherein said orthodontic appliance comprises said matrix material and said plurality of reinforcement structures, said first region being integrally formed with said orthodontic appliance, wherein said orthodontic appliance is made by the method of forming a body from said matrix material having said plurality of reinforcement structures distributed substantially uniformly throughout and suspended within substantially all of said matrix material, forming a skin on an entirety of an exterior surface of said body which is a portion of said matrix material which is substantially devoid of said reinforcement structures or which is lean in relation to an amount of said reinforcement structures present in remaining portions of said matrix material, and removing said skin from at least a portion of said body to provide said first surface area.