EP0316086A2
Expired / Lapsed
EP
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Bracket for orthodontics and process for producing the same
Assignee: Japan Institute of Advanced Dentistry
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Filing: 1988-10-24
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Granted: —
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Expires: 2008-10-24
Abstract
Abstract A bracket (1) for orthodontics is formed of a material obtained by polymerizing and setting a mixture comprising a multifunctional methacrylate and a multifunctional acrylate, a filler, and a polymerization initiator. The body of the bracket (1) has a thin layer of a synthetic resin material (2) which is partly soluble or swellable in a dental adhesive, laminated on the base surface thereof in such a manner that the composite resin material constituting the bracket body and the synthetic resin material constituting the thin layer (2) are mingled with each other at the boundary therebetween. The synthetic resin thin layer (2) is formed by polymerizing and setting a mixture, comprising a monofunctional methacrylate, a polymethacrylate or a copolymer thereof, and a polymerisation initiator. Alternatively, a composite resin material B obtained by polymerizing and setting a mixture comprising a multifunctional methacrylate, a monofunctional methacrylate, a silica filler, and a polymerization initiator, is laminated on the base surface of the bracket body. The brackets (1) have improved physical properties, are asthetically pleasing and the thin layer of resin material (2) provided on the surface of the bracket enables improved adhesion of the bracket (1) to a tooth (12).
Inventors
- 👤 Eiichi Masuhara
- 👤 Shigeo Komiya
- 👤 Kiyomi Sanbonmatsu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 22:23
CPC Classifications
A; A61; A61C; A61C7/00; A61C7/12; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; A61C7/14; A61C7/16
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
71 words
A bracket for orthodontics formed from a bracket material obtained by polymerizing and setting a mixture consisting essentially of: (a) from 40 to 90% by weight of a multifunctional methacrylate and/or a multifunctional acrylate; (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate; (c) from 1 to 30% by weight of a filler; and (d) from 0.01 to 2.0% by weight of a polymerization initiator.
Claim 2
Dependent Claim
71 words
A bracket for orthodontics formed from a bracket material obtained by polymerizing and setting a mixture consisting essentially of: (a) from 40 to 90% by weight of a multifunctional methacrylate and/or a multifunctional acrylate; (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate; (c) from 1 to 30% by weight of a filler; and (d) from 0.01 to 2.0% by weight of a polymerization initiator.
Claim 3
Dependent Claim
29 words
A bracket for orthodontics according to Claim 1, wherein said filler comprising finely divided silica particles surface-treated with a silane coupling agent, or comprising finely divided crosslinking resin particles.
Claim 4
Dependent Claim
34 words
A bracket as claimed in Claim 1 or Claim 2, wherein said polymerization initiator comprises a combination of a peroxide and a tertiary amine, or comprises a combination of a peroxide and a photosensitizer.
Claim 5
Dependent Claim
79 words
A bracket for othodontics comprising: a bracket body made of a composite resin metal; and a thin layer of a synthetic resin material which is partly soluble or swellable in a dental adhesive, the synthetic resin thin layer being laminated on the base surface of said bracket body in such a manner that the composite resin material constituting the bracket body and the synthetic resin material constituting said thin layer are mingled with each other at the boundary therebeween.
Claim 6
Dependent Claim
79 words
A bracket for othodontics comprising: a bracket body made of a composite resin metal; and a thin layer of a synthetic resin material which is partly soluble or swellable in a dental adhesive, the synthetic resin thin layer being laminated on the base surface of said bracket body in such a manner that the composite resin material constituting the bracket body and the synthetic resin material constituting said thin layer are mingled with each other at the boundary therebeween.
Claim 7
Dependent Claim
145 words
A bracket for orthodontics according to Claim 4, wherein the composite resin material that constitutes said bracket body is formed by polymerizing and setting a mixture consisting essentially of (a) from 40 to 80% by weight of a multifunctional methacrylate and/or a multifunctional acrylate, (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate, (c) from 5 to 80% by weight of a filler, and (d) from 0.01 to 2% by weight of a polymerization initiator, and the synthetic resin thin layer laminated on the base surface of said bracket body is formed by polymerizing and setting a mixture consisting essentially of (e) from 30 to 70% by weight of a monofunctional methacrylate, (f) from 30 to 70% by weight of either a polymethacrylate or a copolymer thereof, and (g) from 0.01 to 1% by weight of a polymerization initiator.
Claim 8
Dependent Claim
55 words
A process for producing an orthodontic bracket comprising the steps of: supplying a composite resin paste into a mold; placing on the bracket base forming surface of said composite resin paste a thin layer of a synthetic resin paste which is partly soluble or swellable in a dental adhesive; and polymerizing and setting these materials.
Claim 9
Dependent Claim
55 words
A process for producing an orthodontic bracket comprising the steps of: supplying a composite resin paste into a mold; placing on the bracket base forming surface of said composite resin paste a thin layer of a synthetic resin paste which is partly soluble or swellable in a dental adhesive; and polymerizing and setting these materials.
Claim 10
Dependent Claim
35 words
A process as claimed in Claim 6, wherein said composite resin paste and said synthetic resin paste are of the photopolymerization type and said polymerizing and setting step is carried out by irradiation with light.
Claim 11
Dependent Claim
195 words
A bracket for orthodontics comprising: a bracket body made of a composite resin material A obtained by polymerizing and setting a mixture consisting essentially of (a) from 40 to 80% by weight of a multifunctional methacrylate and/or a multifunctional acrylate, (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate, (c) from 5 to 80 % by weight of a filler, and (d) from 0.01 to 2% by weight of a polymerization initiator; and a thin layer of a composite resin material B obtained by polymerizing and setting a mixture consisting essentially of (e) from 5 to 24% by weight of a multifunctional methacrylate, (f) from 0 to 24% by weight of a monofunctional methacrylate, (g) from 50 to 90% by weight of a silica filler, and (h) from 0.01 to 1% by weight of a polymerization initiator, said thin layer of the composite resin material B being laminated on the base surface of said bracket body in such a manner that the composite resin material A constituting said bracket body and the composite resin material B constituting said thin layer are mingled with each other at the boundary therebeween.
Claim 12
Dependent Claim
195 words
A bracket for orthodontics comprising: a bracket body made of a composite resin material A obtained by polymerizing and setting a mixture consisting essentially of (a) from 40 to 80% by weight of a multifunctional methacrylate and/or a multifunctional acrylate, (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate, (c) from 5 to 80 % by weight of a filler, and (d) from 0.01 to 2% by weight of a polymerization initiator; and a thin layer of a composite resin material B obtained by polymerizing and setting a mixture consisting essentially of (e) from 5 to 24% by weight of a multifunctional methacrylate, (f) from 0 to 24% by weight of a monofunctional methacrylate, (g) from 50 to 90% by weight of a silica filler, and (h) from 0.01 to 1% by weight of a polymerization initiator, said thin layer of the composite resin material B being laminated on the base surface of said bracket body in such a manner that the composite resin material A constituting said bracket body and the composite resin material B constituting said thin layer are mingled with each other at the boundary therebeween.
Claim 13
Dependent Claim
148 words
A process for producing an orthodontic bracket, comprising the steps of: supplying into a mold a composite resin paste A consisting essentially of (a) from 40 to 80% by weight of a multifunctional methacrylate and/or a multifunctional acrylate, (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate, (c) from 5 to 80 % by weight of a filler, and (d) from 0.01 to 2% by weight of a polymerization initiator; placing on the bracket base forming surface of said composite resin paste A a composite resin paste B consisting essentially of (e) from 5 to 24% by weight of a multifunctional methacrylate, (f) from 0 to 24% by weight of a monofunctional methacrylate, (g) from 50 to 90% by weight of a silica filler, and (h) from 0.01 to 1% by weight of a polymerization initiator; and polymerizing and setting these materials.
Claim 14
Dependent Claim
148 words
A process for producing an orthodontic bracket, comprising the steps of: supplying into a mold a composite resin paste A consisting essentially of (a) from 40 to 80% by weight of a multifunctional methacrylate and/or a multifunctional acrylate, (b) from 9 to 50% by weight of a monofunctional methacrylate and/or a monofunctional acrylate, (c) from 5 to 80 % by weight of a filler, and (d) from 0.01 to 2% by weight of a polymerization initiator; placing on the bracket base forming surface of said composite resin paste A a composite resin paste B consisting essentially of (e) from 5 to 24% by weight of a multifunctional methacrylate, (f) from 0 to 24% by weight of a monofunctional methacrylate, (g) from 50 to 90% by weight of a silica filler, and (h) from 0.01 to 1% by weight of a polymerization initiator; and polymerizing and setting these materials.
Claim 15
Dependent Claim
37 words
A process for producing an orthodontic bracket according to Claim 11, wherein said composite resin pastes A and B are of the photopolymerization type and said polymerizing and setting step is carried out by irradiation with light.
References Cited (Backward Citations)
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