Evaluation of The Effect of Two Surface Treatment Methods on Shear Bond Strength Between Porcelain Veneer and Two Different Zirconia Blocks

Abstract

Introduction: Cracking and licking are one of the problems of all-ceramic restorations. So far, several ways have been presented to minimize these problems. The aim of study was Evaluation of the Effect of Two Surface Treatment Methods on Shear Bond Strength Between Porcelain Veneer and Two Different Zirconia Blocks. Method and Materials: 60 disk zirconia samples (30 samples of Dentium zirconia and 30 samples zirconia) were used (diameter of 10 mm and a thickness 4 mm). Based of surface treatment, samples of each zirconia were randomly divided 3 groups: Control, air-particle abrasion, Zircose E Solution. Using metal mold, the porcelain was veneered on zirconia surface and then fired. Then all samples subjected to shear bon strength testing using a universal testing machine at a speed 1mm/min until breaking. All data analyzed by two-way analyses variance. Results: There was a statistically significant difference between the mean variable shear bond strength in the control group and the mean in both groups "airborne particle abrasion" and " etching" and the mean variable shear bond strength in the control group was less than the average in both groups. And There was no statistically significant difference between the mean variable of shear bond strength in the two groups of "airborne particle abrasion" and " etching" . There was a statistically significant difference between the mean of shear bond strength in zirconia species and the average shear bond strength in Novi was lower than the average in Dentium. And There was no interaction between the type of surface preparation and the type of zirconia, in other words, the effect of the type of surface preparation on the average shear bond strength was the same in both types of zirconia. Conclusion: According to the results obtained in this study, it can be concluded that surface preparation with air particle abrasion and etching increases the shear bond strength of zirconia to porcelain veneer and shear bond strength of zirconia and porcelain veneer is affected by the type of zirconia.