Influnce On Porcelain Repareing From Different Ceramic Surface Treatments

Objective: study the effects caused by different coarseness treatment on ceramic surface on the shear bond strength of ceramic surface and composite resin, and provide the support for clinic research. Method: 40 Ni-Gr alloy cylindrical specimens are divided into four groups randomly. Except the control group, rest of groups are coarsely treated by acid-etching, sand abrasive, and combination of acid-etching and sand abrasive respectively. All the specimens are repaired by DENSPLY system (nano ceramic restorative). Bonded specimens were stored in 37℃distilled water for 24 hours. Afterwards, shear bond strength of ceramic surface and composite resin are tested for each specimen and test results are processed by statistical analysis. Results: three treated groups of specimen produce higher shear bond strength than that of control group. Among these groups, the group with acid-etching has the highest shear bond strength. The shear bond strength of sand abrasive group is less than that of acid-etching group but higher than that of the group with combination treat. The shear bond strength of the combination group is least among all the treated groups. Conclusion: (1) all these treatments (acid-etching, sand abrasive, and combination of acid-etching and sand abrasive) can increase shear bond strength between ceramic surface and composite resin. (2) As far as shear bond strength is concerned, acid-etching treatment is best, sand abrasive is second to the best.(3) Although the combination treatment can increase the bond strength,but it is the worst.