Compositions: coating or plastic – Coating or plastic compositions – Dental
Reexamination Certificate
1999-08-24
2001-04-17
Koslow, C. Melissa (Department: 1755)
Compositions: coating or plastic
Coating or plastic compositions
Dental
C523S116000, C433S226000, C433S228100
Reexamination Certificate
active
06217644
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dental adhesive set comprising a tooth surface conditioning agent and a bonding material, which is used for adhering a dental composite resin to a tooth structure. More particularly, it relates to a dental adhesive set for continuously releasing a fluoride ion which is considered to be effective for reinforcing a tooth structure when a dental restorative material such as a dental composite resin is adhered to an enamel/dentin.
2. Description of the Related Art
A dental composite resin as a dental restorative material is superior in esthetics and has superior in mechanical properties and handling. For these reasons, the dental composite resin is now widely used as a dental restorative material. However, the composite resin itself has no adhesive properties to a tooth structure. For this reason, in order that the dental composite resin is adhered to a tooth structure, it is considered to be necessary to use an exclusive adhesive having strong adhesive properties, which is simple in handling and safe and reliable. Dental adhesives which have hitherto been used are composed mainly of an unsaturated organic compound and a polymerization catalyst for polymerizing it for curing and optionally, an adhesive monomer, etc. The dental adhesive is used upon application when the dental composite resin is filled. However, since when only the dental adhesive is used, a sufficient adhesive strength is not obtained, it is necessary to subject a cavity to tooth surface conditioning or priming in advance.
In a representative adhesion handling method are employed a series of handlings in which tooth surface conditioning of a tooth structure with an acid solution such as phosphoric acid or citric acid, water washing, drying, priming, drying, application of a bonding material, polymerization, and filling of a composite resin are carried out in this order. Also, there has been known a method in which tooth surface conditioning using a self-etching primer composed of, as a cavity conditioner, an adhesive monomer containing a hydrophilic group such as a phosphoric acid group or a carboxyl group, water, a solvent, a polymerization catalyst, etc., drying, application of a bonding material, polymerization, and filling of a composite resin are carried out in this order.
In recent years, in the preventive dentistry field, expecting a reinforcement of tooth structure and inhibition of a secondary caries by a fluoride ion are used many dental products containing fluoride, such as a fluoride application agent, a fluoride-containing toothpaste, and a fluoride-containing pit and fissure sealant. In addition, in dental restorative materials, a glass ionomer cement is drawing the attention as a material having properties for continuously releasing a fluoride ion and has widely been used for various applications such as a filling material, a luting material, a lining material, a pit and fissure sealant, and an adhesive. However, the glass ionomer is required to mix a fluoride-containing fluoroalumino silicate glass powder and a carboxylic acid aqueous solution at the time of use and therefore, involves a defect that the handling is complicated.
On the other hand, though the dental composite resin which is clinically used frequently every day because the handling as a restorative is simple and is superior in mechanical properties, esthetics, and handling, it does not have properties for releasing a fluoride ion. Further, the dental adhesive which is used together with the restorative composite resin does not have properties for releasing a fluoride ion. Accordingly, it can not be said that the restoration by the composite resin and the adhesive expects the reinforcement of tooth structure or inhibition of secondary caries.
In recent years, products in which a fluoride is contained in a composite resin or a dentinal adhesive are being developed. However, since the fluoride compound used in these products is soluble in water, when it comes into contact with a saliva in the oral cavity, a fluoride ion is released from the material within a short period of time so that an effective reinforcement of tooth structure can not be expected. Also, this causes lowering of the mechanical properties of the material itself.
SUMMARY OF THE INVENTION
The present inventors have paid an attention to a point that the composite resin or the dental adhesive used for the dental restoration does not have properties for continuously releasing a fluoride ion which can be expected to have a reinforcement of tooth structure function or inhibition of a secondary caries as well as to a point that the glass ionomer cement having properties for continuously releasing a fluoride ion is required to be kneaded at the time of use and hence, is difficult in operation. Thus, an object of the present invention is to provide a dental adhesive set comprising a tooth surface conditioning agent and a bonding material which is of one-pack type and does not require mixing, which can firmly and surely adhere a dental restoration to a tooth structure by a clinically simple manipulation and can achieve dental restoration, reinforcement of tooth structure and have inhibition of secondary dental caries by imparting properties for continuously releasing a fluoride ion to the bonding material.
In order to achieve the above-described object of the invention, the present inventors have made extensive and intensive investigations. As a result, we have successfully developed a one-pack type photopolymerizable bonding material having properties for continuously releasing a fluoride ion by containing a fluoroalumino silicate glass powder, an acid, and water into a polymerizable unsaturated organic compound having at least one CH
2
═CR
1
—COO—, wherein R
1
is H or CH
3
, and not having an acid group, thereby previously undergoing an acid-base reaction among the fluoroalumino silicate glass powder, the acid, and water to obtain a one-pack type paste or suspension; and further compounding a photopolymerization catalyst thereinto.
Moreover, it has been found that when used together with an acid-containing tooth surface conditioning agent which is used for usual dental adhesives, this one-pack type mixing-free bonding material can be expected to have superior adhesive durability and reinforcement of tooth structure by a fluoride ion continuously released from the adhered portion, leading to completion of a dental adhesive set according to the present invention, which comprises a tooth surface conditioning agent and a bonding material.
This dental adhesive set according to the present invention can ensure a proper thickness of a coating film in the cavity because the bonding material has a proper viscosity. Thus, a space between the tooth structure and the dental composite resin can be surely sealed, thereby obtaining superior fitness without generating a gap therebetween.
The dental adhesive set according to the present invention comprises (I) a tooth surface conditioning agent and (II) a bonding material, wherein
the tooth surface conditioning agent (I) is an acid aqueous solution, and
the bonding material (II) comprises a mixture of:
(a) a fluoroalumino silicate glass powder,
(b) one or two or more unsaturated organic compounds selected from polymerizable unsaturated organic compounds having at least one CH
2
═CR
1
—COO—, wherein R
1
is H or CH
3
, and not having an acid group;
(c) an acid;
(d) water; and
(e) a photopolymerization catalyst.
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Akahane Shoji
Matsunae Kaori
GC Corporation
Koslow C. Melissa
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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