Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
1998-12-17
2001-09-11
Szekely, Peter A. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C523S116000, C524S547000, C524S556000, C524S560000, C524S100000, C524S832000, C522S017000, C522S020000, C526S277000
Reexamination Certificate
active
06288138
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a kit for a dental adhesive. More specifically, it relates to a kit for a dental adhesive (an adhesive composition) which is excellent in curability at a temperature range and a humidity/wet range which affect living bodies as well as the water resistance, strength, adhesion, color tone and storage stability of a cured product. Further more specifically, it relates to a dental adhesive kit for a curable adhesive composition for use as a coating material, bonding material, primer or pre-treatment agent which can be applied not only to a tooth but also to dental metals, ceramics and resins such as composite resins, hard resins, resins for a base and cement, particularly a curable adhesive composition having excellent performance in an adhesive material or coating material application out of these application fields.
PRIOR ART
Heretofore, as a curable composition to be applied to a dental adhesive material, composite resin, hard resin, floor resin, cement or coating material, there have been proposed many curable compositions which comprise a radical polymerizable monomer such as a vinyl monomer typified by a styrene derivative and (meth)acrylic acid derivative and a polymerization initiator (catalyst or curing agent in some cases) for polymerizing the monomer to cure.
Requirements for a curable composition for a living body, especially a tooth, include a relatively high curing speed at a temperature range and a humidity/wet range to which a living body can be exposed to, a controllability of the curing speed, the high water resistance, strength and adhesion of a cured product, an easy controllability of color tone, and excellent storage stability that the composition can be preserved while retaining these properties stably. When the curable composition is used as an adhesive material, materials to be bonded with this composition include not only teeth but also a variety of materials such as metals, ceramics, resins before and after curing (may be simply referred to as “resin” hereinafter), composite resins, resin cement and the like. Therefore, the curable composition must have properties for bonding these materials.
There are the following proposals for attaining the above requirements using a curable composition comprising a radical polymerizable monomer and a photopolymerization initiator. JP-B 53-33687 and JP-B 54-10986 (the term “JP-B” as used herein means an “examined Japanese patent publication”) propose a composition comprising a carbonyl compound such as &agr;-diketone and an amine. However, the cured product thereof changes its color tone and is unsatisfactory in terms of water resistance, strength and adhesion. JP-A 56-120610 (the term “JP-A” as used herein means an “unexamined published Japanese patent application”) proposes a photocurable composition comprising a vinyl monomer having an acid group, &agr;-diketone and an aromatic sulfinate. The composition is excellent in the stability of color tone but has problems with strength and adhesion durability. JP-B 61-3684 proposes a composition comprising a monomer containing carboxylic anhydride, an organic peroxide, amine and aromatic sulfinate but the composition is unsatisfactory in terms of adhesion strength. JP-A 60-44508, JP-A 60-123515 and JP-B 7-2613 propose compositions each of which comprises a carboxylic acid-containing monomer and an aromatic sulfinate and further contains an amine or &agr;-diketone and dialdehyde according to application purpose. These compositions, too, do not have sufficiently high adhesion strength. Thereafter, JP-B 6-62688 proposes a composition which comprises a carboxylic acid-containing monomer, &agr;-diketone, amine and aromatic sulfinate and has greatly improved color tone stability and improved adhesion and durability.
The above proposals are based on the premise that the surface of a tooth is in advance treated with an etching composition containing an acidic compound. This etching is aimed to remove a chippings layer (smear layer) remaining on the tooth surface when the tooth is chipped, and to improve adhesion strength. In recent years, there has also been proposed a method for treating the surface of a tooth with a primer composition comprising a monomer after it is etched or while the smear layer remains thereon, and then applying a curable composition thereto. The proposals for improving adhesion strength by applying the curable composition after etching or treating with a primer involve such a problem that it takes an operator much time and labor and becomes complicated, thereby extending treatment time and increasing a load on a patient.
It is generally considered that an adhesive material component must be diffused up to a healthy tooth and the diffused adhesive material component must be cured without fail so as to be firmly bonded to the tooth for a long time. However, various problems have been apprehended for a curable adhesive composition which is applied after the use of an etching composition and a primer composition, or an adhesive material which is applied in the same manner. For example, in a method comprising use of a tooth etching material and a curable composition, even a healthy tooth may be invaded by etching for removing a smear layer which is formed when dental caries is chipped and removed, thereby causing deterioration in a bonded site.
It is desired that an adhesive material for teeth should firmly bond a repair material to a tooth without a gap and the treatment should be done in a short period of time with ease as much as possible because this bonding work is carried out in a mouth.
As means of treating the surface of a tooth to firmly bond a resin repair material to the tooth, the following three methods are mainly employed. That is, the first means is an etching method comprising applying a solution having tooth-deliming properties such as phosphoric acid or citric acid to the surface of enamel and/or dentine and washing it with water, the second means is an etching primer method comprising applying a primer to the surface of a tooth which has been subjected to the above etching method and drying it, and the third means is a self-etching primer method comprising applying a primer having a deliming function to a tooth, without etching. These tooth treating methods are a pretreatment which is conducted before an adhesive material for bonding a material for repairing a partially lost tooth to a tooth, that is, a bonding material or resin cement, is applied to a tooth. The tooth and the material for filling up the loss cannot be firmly bonded to each other with the pre-treating composition alone.
JP-B 63-25562 discloses a dental material comprising a vinyl monomer having an acid group, &agr;-diketone, aromatic sulfinate or thiourea.
JP-A 10-245525 discloses an adhesive composition which comprises a specific phosphoric acid group-containing polymerizable monomer, a polycarboxylic acid group-containing polymerizable monomer and a polymerization initiator and does not require a retreatment for a tooth.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a kit for a dental adhesive (an adhesive composition) having sufficient adhesion performance to dentine and sufficient durability.
It is another object, of the present invention to provide a kit for a dental adhesive composition which eliminates the need for carrying out a pretreatment such as etching and primer treatment before a curable composition is applied to a tooth, particularly an adhesive composition which can be directly applied to a tooth from which dental caries has been chipped and removed (i.e., a healthy tooth having a smear layer).
Stated more specifically, the present invention provides a kit for a dental adhesive composition (may be referred to as “self-etching bonding material composition” hereinafter) which is directly contacted with a tooth to delime part or all of the smear layer in order to diffuse into the substrate of the tooth an adhesive material component exhibiting adhesive strength and at the same
Arata Masami
Otsuki Haruka
Tanaka Harumi
Tomikawa Tamotsu
Ueki Hideyuki
Sun Medical Co., Ltd.
Szekely Peter A.
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