合成樹脂接着剤による齲蝕予防填塞物の窩溝における引張り残留状態に関する研究
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概要
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A caries preventive method by filling the pit and fissure in the occlusal surface with Ethyl-2-eyanoacrylate and Polymethylmethacrylate has been developed by Takeuchi and others, based on Takeuchi's Epidemiological principles of dental caries attack.<BR>Contrary to a suspicion that the filled material will soon come off or abrade after exertion of this procedure, all the results of previous studies for testing its effectiveness indicated that this method is good for caries prevention for at least more than six months. This study, therefore, was made to observe the positions in the pit and fissure where the filled material might remain if abrasion or coming off should occur, and to presume the reason of its remaining in respective positions.<BR>Materials and methods : sixty extracted teeth, that is, twenty each of invested wisdom teeth, the upper, and the lower first premolars, were used. After the routine procedures of sealing of the pits and fissures with resin adhesives, the teeth underwent the most severest condition that might occur in the oral cavity, a thermal changes at 0°C and 60°C. Then, by tensile force destruction of the material was induced in the pits and fissures. The teeth were ground buccolingually, taking series of continued pictures of the sections at 50 μ intervals, and enlarged tracings were obtained from these films.<BR>Results : observations made from varying standpoints resulted in the findings that even by the tensile force, the material came off, being fractured around the basal line of measurement, an imaginary fundus of the fissure ; and that a major reason of this retention lies in the existence of continuous formation of undercuts in the direction of the tensile destruction observed in three consecutive sections, that is, within the thickness of approximately 150 μ. Unhomogenous physico-chemical distribution of the filling material and the stress upon the filling are also considered as another reason of the retention.
- 有限責任中間法人 日本口腔衛生学会の論文