Drug – bio-affecting and body treating compositions – Dentifrices – Oxygen or chlorine releasing compound containing
Patent
1995-12-07
1998-01-13
Kulkosky, Peter F.
Drug, bio-affecting and body treating compositions
Dentifrices
Oxygen or chlorine releasing compound containing
424605, 424613, 424 57, 424 49, 523118, A61K 720, A61K 724, A61K 602, A61K 6083
Patent
active
057076111
DESCRIPTION:
BRIEF SUMMARY
This application is a 371 of PCT/JP95/00665, filed Apr. 6, 1995.
INDUSTRIAL UTILIZATION FIELD
The present invention relates to a tooth surface treating agent comprising a polymerization catalyst and an acidic compound which are both soluble in water, the treating agent being capable of enhancing tooth adhesion. More particularly, the invention relates to a tooth surface treating agent for simultaneously treating substrates of vital hard tissues, more particularly enamel and dentin substrates of natural teeth, thereby to impart strong adhesion effect to the substrates.
PRIOR ART
Recently, with the advance of tooth bonding techniques in the field of dentistry, dental restoration through adhesion utilizing a composite resin has been in wide practice. In such situation, a 10-65% phosphoric acid treating agent has been known to be a useful tooth surface treating agent such that it acts to moderately demineralize enamel prisms thereby to impart strong adhesion effect to the enamel through mechanical anchor effect of the resin. Thus, for utilization of such treating agent, clinical techniques are today being established. For use of such agent with dentin, the situation is different. Unlike the case in which the phosphoric acid treating agent is used with the enamel, it has been impracticable to expect that such treating agent can impart strong adhesion effect to the dentin since the pH value of the acid which is very low is apt to cause excessive demineralization of the inorganic component of teeth and softening of the dentin, though some tooth surface cleaning effect is expectable.
More recently, two types of tooth surface treating agents, other than phosphoric acid treating agent, have been used in dental clinics, one comprising 10% citric acid/3% ferric chloride, the other comprising 10% citric acid/20% calcium chloride. Japanese Patent Application Laid-Open No. 5-186309 teaches a tooth surface treating agent which comprises organic acids, such as citric acid, oxalic acid, and maleic acid, iron salt and water, and a tooth surface treating method which comprises use of such treating agent and a bonding material including a barbituric acid derivative. These may be taken as attempts to provide a mordant effect such that the dentin softened by acid treatment is reinforced by metallic chloride. In reality, however, where a collagen layer is formed as a result of demineralization of inorganic component, or where post-treatment water washing of the tooth surface is insufficient, some calcium salt of undissolved acid may deposit on the tooth surface, which prevents the provision of any strong bond effect. According to the experiments conducted by the present inventors, the use of these tooth surface treating agents failed to provide any sufficient bond strength.
In this way, various types of tooth surface treating agents have hitherto been used Which comprise phosphoric acid, citric acid, maleic acid, oxalic acid and/or a combination of any such acid and a metallic chloride, but what can be expected of such treating agent is limited to the demineralization of inorganic component and tooth surface cleaning effect. As such, with these treating agents, it has been impracticable to impart strong adhesion effect to the substrates of enamel and dentin. Therefore, from a standpoint of dental clinics, there has been a strong need for an improved tooth surface treating agent which contributes to clinical operation simplicity such that the treating agent can simultaneously treat both the enamel and the dentin and impart strong adhesion effect to them.
SUBJECT THAT THE INVENTION IS TO SOLVE
The present invention has been made in view of the foregoing situation and, accordingly, it is an object of the invention to provide a tooth surface treating agent which can be advantageously used for simultaneous treatment of the enamel and dentin substrates of natural teeth thereby to impart strong adhesion effect to them.
MEANS OF SOLVING THE SUBJECT
The invention relates a-tooth surface treating agent comprising a polymerizati
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patent: 4657941 (1987-04-01), Hosoda
patent: 4952613 (1990-08-01), Blackwell
patent: 5166117 (1992-11-01), Imai et al.
patent: 5264513 (1993-11-01), Ikemura
patent: 5525648 (1996-06-01), Aasen et al.
Journal of the Japan Society for Dental Apparatus and Materials, vol. 23, No. 61, pp. 29-33, 1982.
Ikemura Kunio
Kimoto Katsuya
Kouro Yoshiaki
Tachidokoro Hisaaki
Kabushiki Kaisha Shofu
Kulkosky Peter F.
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