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KMID : 0988720060220020181
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2006 Volume.22 No. 2 p.181 ~ p.191
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Tensile Strengh of Demineralized Dentin derived from Self-Priming Adhesives
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Lee Kwang-Won
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Abstract
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Tensile Strengths of Demineralized Dentin derived from Self-Priming Adhesives Hye-Yun Lee, Mi-Ran Yoon, Rin Lee, Jeong Lee, Kwang-Won Lee* Department of Conservative Dentistry, School of Dentistry, Chonbuk National University The objectives of this study were to evaluate the tensile strength of resin-infiltrated demineralized dentin according to the demineralization time, and to evaluate the tensile strength of hybrid layer that is formed by infiltrating different priming adhesives or primer/adhesive into demineralizd dentin matrix. Seventy five hour-glass shaped dentin specimens were prepared in mid-coronal dentin from extracted human molars. Thirty specimens were distributed into three groups according to demineralization time - 2 hours, 4 hours and 8 hours. Each specimen was placed in primer/adhesive of All-Bond 2 for 5 hours of infiltration. Another forty-five specimens of them were demineralized in 37% phosphoric acid for 4 hours. They were randomly assigned to three experimental groups - AB, SB and OS - to designate All-Bond 2, Single Bond and One-Step. Each specimen was placed in one of three different adhesives for 5 hours of infiltration. The specimens were visible light-cured for 5 minutes, and then stored for 24 hours in distilled water at 37℃. After that, microtensile bond strength for each specimen was measured, and the fractured surfaces were then observed by SEM. The data were statistically analysed by one-way ANOVA and Tukey`s multiple comparison test and Bonferroni`s multiple comparison test. The results were as follows; 1. Tensile strength of the group demineralized for 4 hours was significantly higher than that of groups demineralized for 2 hours and 8 hours (P < .01). 3. Tensile strength of the AB group was significantly higher than that of the SB group and OS group (P < .01).
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KEYWORD
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Self-priming adhesives, Tensile strength, Hybrid layer, Demineralized dentin
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