Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-08-22
1999-02-02
Merriam, Andrew E.C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
522 29, 524183, 524184, 524413, 526196, 526198, C08K 555, A61K 600
Patent
active
058666311
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a dental primer composition and a polymerization catalyst. More specifically, it relates to a dental primer composition for firmly bonding a crown repairing material such as a composite resin, metal or ceramic to a tooth in a dental treatment field and to a polymerization catalyst useful particularly for this purpose.
To repair a tooth damaged by dental caries or by accident, a crown repair material such as a composite resin, metal, ceramic or the like is bonded to the tooth by an adhesive. As the adhesive for bonding a crown repair material to the tooth, there are currently available optically polymerizable adhesives and chemically polymerizable adhesives which are used depending on the type of a crown material. For example, an optically curable bonding material is used for repairing by using optically curable composite resins, while a resin cement which is a chemically polymerizable adhesive is used for repairing by using metal casts and ceramics.
The adhesive is required to keep the crown repair material firmly bonded to the tooth for a long time in such a severe environment as the oral cavity. If the adhesive strength of the adhesive is low or the durability of the adhesive is insufficient, the repair material may fall off, or a gap may be produced between the tooth and the repair material with the result that bacteria may enter the gap, causing secondary dental caries.
The hard tissue of a tooth consists of enamel and dentin and a crown repair material is required to be bonded to both enamel and dentin clinically. Heretofore, to improve adhesion, the surface of a tooth has been pretreated prior to the application of an adhesive. A material for this pretreatment is generally an acidic aqueous solution for demineralizing the surface of a tooth, such as an aqueous solution of phosphoric acid, maleic acid or citric acid. In the case of enamel, the adhesion mechanism to the treated surface is mechanical macroscopic retention produced when an adhesive permeates the surface that has been made rough by demineralizing with an acidic aqueous solution, and hardens. Thereby, sufficient adhesive strength is obtained clinically. On the other hand, in the case of dentin, the adhesion mechanism is mechanical microscopic retention produced when an adhesive infiltrates into micro voids of a sponge-like collagen fiber exposed to the surface of a tooth after demineralizing, and hardens. However, since the infiltration of the adhesive into the exposed collagen layer is not easy, a generally called primer which is a permeation accelerating material is used and hence, operation becomes complicated.
To cope with this problem, for the purpose of simplifying bonding operation, a primer for the simultaneous pretreatment of both enamel and dentin has been studied. Japanese Laid-open Patent Publication Hei 3-240712 discloses a primer composition comprising a polymerizable monomer containing an acidic group, a polymerizable monomer containing a hydroxyl group, water and a curing material; Japanese Laid-open Patent Publication Hei 4-8368 a primer composition comprising a polymerizable monomer containing an acidic group, a polymerizable monomer containing a hydroxyl group, water and an amino compound having an acid group; Japanese Laid-open Patent Publication Hei 6-192029 discloses a pretreatment material comprising vinyl phosphonic acid, vinyl phosphonic acid metal salt, carboxylic acid having a hydrophobic group, water and alcohol; Japanese Laid-open Patent Publication Hei 6-192030 a pretreatment material comprising an organic sulfonic acid metal salt, organic carboxylic acid having a hydrophobic group, water and alcohol; Japanese Laid-open Patent Publication Hei 7-82115 a primer composition comprising a vinyl compound having an acidic group, a vinyl compound having a hydroxyl group, water, aromatic sulfinic acid and amine; Japanese Laid-open Patent Publication Hei 7-89820 a primer composition comprising a polymerizable monomer having an acidic group, water and a compound having an amide group and a hydro
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Nakagawa Hiroyuki
Ohno Hideki
Merriam Andrew E.C.
Tokuyama Corporation
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