화학중합형 및 광중합형 레진접착제가 금속 및 도재브라켓의 전단결합강도에 미치는 영향

EFFECTS OF CHEMICALLY CURED RESIN AND LIGHT CURED RESIN ON SHEAR BOND STRENGTH OF METAL BRACKET AND CERAMIC BRACKET

This study was designed for comparison of shear bond strengths and failure patterns of four experimental groups which combinated mesh-backed metal brackets and texture based ceramic brackets (Transcend series 2000^(™)) with chemically cured resin (Mono Lok2^(™)) and visible light cured resin (Transbond^(™)). Brackets were bonded on the extracted human bicuspids, after etching them by manufacturer´s recommand, and the shear bond strengths were measured on the Instron machine after 24 hrs passed in the 37°C water bath. The results were as follows. 1. Ceramic brackets, transcend series 2000^(™), bonded with MonoLok2^(™) showed statistically higher shear bond strength than mesh-backed metal brackets bonded with MonoLok2^(™). 2. There was no significant difference in shear bond strengths between metal and ceramic brackets bonded with Transbond^(™). 3. Ceramic brackets bonded with both Transbond^(™) and MonoLok2^(™) showed primarily fractures bet?ween brackets adhesive interface. 4. Enamel crack was not found in anyone specimen.