The purpose of this study was to evaluate the shear bond strength of three kinds of different ceramic brackets with three different bonding adhesives. 5 specimens for each combination were tested for shear bond strength using Instron and for fracture site using SENL And 3 specimens were cross-sectioned for SEM examination of bonding pattern between bracket, resin and enamel surface.
The results were as follows
1. The shear bond strength of chemical curing adhesives were higher than that of light curing adhesives.
2. The shear bond strength of Starfire bracket, chemical-bonded type, was lower than that of Transcend bracket, mechanical-bonded type, and Fascination bracket, combined type.
3. Fracture site of each bracket and tooth surface was examined under a light optical stereoscopic microscope, Transcend groups were mainly at the E/R intderface. Fascination groups were mainly at the COMB interface and Starfire groups were mainly at the R/B interface.
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