[Shear bond test of HF acid etching porcelain bonded to enamel with different concentration and disposing time]

OBJECTIVE:Understand the effect of shear bond test of HF acid etching porcelain bonded to enamel with different concentration and disposing time. METHODS:After HF acid etching under 30 groups composed of 5 different HF concentrations and 6 exposing times,shear bonding strength of porcelain to enamel was tested under imitating occlusion and debonding types of the composite were examined by microscope.RESULTS:The favorable concentration-time groups for clinics were 2.5%-5min;5.0%-2.5min;10%-30s;7.5%,15%-5min.The debonding type of porcelain resin enamel composite body was mixed one.CONCLUSION:The results showed HF acid etching technique had a positive influence on the bonding strength of porcelain to enamel.