International Journal of Applied Dental Sciences
2020, Vol. 6 Issue 4, Part A
Shear bond strength of feldspathic porcelain in metal ceramic crowns and failure mode after multiple firing cycles (In-vitro Study)
AUTHOR(S): Omaymah Albarudi and Ebtisam Alsalameh
To investigate the effect of multiple firing cycles on shear bond strength and failure mode of porcelain fused to metal.
Materials and Methods: thirty porcelain fused to metal discs were divided into three groups according to number of firing cycles subjected to; group A; three firing cycles, group B; five firing cycles and group C; seven firing cycles to sinter the porcelain. All the specimens were labeled and stored in distilled water for 48 hours before testing. Shearing test was done by compressive load applied using a chisel shaped metallic rod attached to the upper movable compartment of testing machine traveling at cross-head speed of 1 mm/ min. Fractured specimens were ultrasonically cleaned, carefully checked. All failures mode were analyzed.
Results: The test results showed a statistically significant difference in the mean shear stress averages among the three studied groups (p <0.05) where the first group had 56.90 MPa. The second group is 51.69 MPa, while the third group is 43.54 MPa (Mega Pascal).
Conclusion: Repeated firing cycles up to seven cycles had significant effect on shear bond strength of porcelain fused to metal. Regarding failure mode; all samples had mixed (cohesive adhesive) failure.
Pages: 17-20 | 266 Views 17 Downloads
How to cite this article:
Omaymah Albarudi, Ebtisam Alsalameh. Shear bond strength of feldspathic porcelain in metal ceramic crowns and failure mode after multiple firing cycles (In-vitro
Study). Int J Appl Dent Sci 2020;6(4):17-20. DOI: https://doi.org/10.22271/oral.2020.v6.i4a.1041