Effect of multiple firings on shear bond strength of feldspathic porcelain to base metal alloys : An in-vitro study
Journal Title: Indian Journal of Dental Advancements - Year 2016, Vol 8, Issue 2
Abstract
Background: The objective of the present study was to evaluate the effect of repeated firings on the metal-ceramic bond strength of cast Ni-Cr and Co-Cr alloy. Materials and Methods: Feldspathic porcelain (VITA VM13 Zahnfabrik, Bad Sackinger, Germany) was fused to Ni-Cr alloy ( Wiron 99, Bego ) and Co-Cr alloy ( Wirobond C, Bego ). Thirty cylindrical specimens were cast for each alloy. Feldspathic porcelain was applied on the upper surface of the cylinders and fired according to manufacturers' instructions. In each group, specimens were divided into 3 subgroups based on repeated firings (3, 5, 7). Shear bond strengths were determined in a universal testing machine (INSTRON 3366, Norwood, USA), with a 2500-kgf load cell and crosshead speed of 1 mm/min), using a custom made steel apparatus. Failure loads were statistically analyzed first with the one-way ANOVA, and then compared with the Student t test. Results: One-way ANOVA test results showed no statistical differences between the metal-ceramic bond strength of Ni-Cr alloy (P = 0.127) and Co-Cr alloy (P = 0.087) after firing 3, 5, and 7 times. The mean shear bond load (N) for Ni-Cr alloy group (860.58 ± 40.81) was significantly higher (p=0.001) than Co-Cr alloy group (679.18 ± 43.31). Conclusion: The mean shear bond strength for the metal ceramic systems tested were not significantly affected by multiple firings and were considered as clinically acceptable for metal-ceramic restorations.
Authors and Affiliations
Sangeeta J Nair, Veena Hegde, Tapan Teja Vallabhaneni
Keywords
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- EP ID EP480482
- DOI 10.5866/2016.8.10089
- Views 125
- Downloads 0
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