Studies on Adhesion Properties of Shellac to Bovine Enamel

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Though an attempt to apply a natural resin shellac in the dental field has been made in recent years, almost no study have concerned its adhesive strength to the tooth surface or its persistency. In the present study, therefore, the adhesive strength of shellac to the enamel surface, the influence of etching treatment on the adhesive strength and possible changes in the adhesive strength following thermal loading due to thermal cycle were examined by means of compressive shear bond strength test. By using a test material composed of shellac in alcohol solution and bovine extracted tooth, the adhesive strength of shellac at varied concentrations was examined with the results as below. The adhesive strength with no etching treatment was about 5MPa irrespective of the shellac concentration used and no significant difference was observed between the examined groups. When an etching treatment was applied, however, the adhesive strength significantly increased in almost all experimental groups with the maximum value of 13.7±1.5MPa. Though a decreased adhesive strength was observed in all groups examined after thermal loading due to thermal cycle, the rate of decrease however tended to be relatively small in experimental groups at a shellac concentration ranging 0.1 to 1%. In particular, the rate of decrease was the smallest in 0.1% shellac group(11.4%) and the adhesive strength of 10.6 1.9MPa was maintained even after thermal cycle. Based on the above evidences, an practical adhesive strength was suggested to be successfully maintained to some extent of period when it is applied to human oral cavity.
奥羽大学の論文
2003-03-31

Studies on Adhesion Properties of Shellac to Bovine Enamel

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