Shear Bond Strength of three Intra-oral metal-ceramic repaire systems

Abstract

Replacement of a fractured metal-ceramic restoration is not possible in some cases. Combination of different surface treatments and repair systems have been recommended for this purpose. The present study assessed the shear bond strength of three intra-oral metal-ceramic repair systems. Materials and Methods: In this in vitro study, 30 cylindrical metal specimens and 30 porcelain specimens fabricated . The specimens were embedded in a ring, After surface treatment with silicon carbide papers and then airborne-particle abrading with 100-mm aluminum oxide, the specimens received one of the following repair systems including Porcelain - Repair Kit (ultradent Products,UT,USA), (Ivoclar Vivadent, New York, USA) Ceramic repair, Clearfil Repair Multi Purpose (KURARAY AMERICA, New York ,USA). according to the manufacturers instructions. The specimens were stored in incubator then thermal cycled. The shear bond strength of the specimens was determined and failure types were also inspected through stereomicroscope. The data were subjected to 2-way, 1-way ANOVA and Tukey post hoc tests. Results: On porcelain substrate, the mean and standard deviation of shear bond strength using Porcelain -Repair Kit, Clearfil Repair Multi Purpose and Ceramic Repair repair systems were 12.16 (4.59), 10.19 (4.18) and 12.68 (4.89) while the rates were 14.32 (3.15), 24.66 (3.25) and 13.32 (3.83) in the metal substrate. The bond strength of Clearfil system was significantly higher than others in the metal substrate (both: p<0.0001) while no other significant differences was noted in the paired comparisons. All metal specimens showed adhesive failures while the porcelain specimens demonstrated more cohesive failures. Conclusion: Although, replacement of the fractured metal-ceramic restorations is the ideal treatment modality , with the limitation of this study in the porcelain substrate all repair systems can be used . Clearfil Repair Multi Purpose repair system was associated with higher bond strength in the metal substrate.