Aim: This study aims to evaluate the effect of lithium disilicate glass-ceramic liner, silicon dioxide based liner, and glass-ceramic interlayer on the shear bond strength (SBS) of a commercially available veneered zirconia block and to study fractographic behavior of the samples using universal testing machine, scanning electron microscope (SEM).
Setting and design: In vivo - comparative study.
Materials and methods: 60 samples were fabricated from VITA (vita zahnfabrik. Bad sackingen, Germany) zirconia discs. Samples were divided into 4 groups with 15 samples each. First is the control group, second is lithium disilicate glass-ceramic liner group, third is silicon dioxide based liner, and fourth is glass-ceramic interlayer group. SBS of samples was recorded using universal testing machine. Samples were further analyzed for fractographic behavior using SEM.
Statistical analysis used: One Way ANOVA test, and Chi-Square test.
Results: The intergroup comparison of mean SBS (Mpa) was done using the post hoc Bonferroni test. The mean SBS (Mpa) was significantly more among lithium disilicate and glass-ceramic interlayer groups in comparison to silicon dioxide-based liner group. Fractographic analysis was done using the Chi-square test.
Conclusion: It was concluded that maximum SBS was obtained for lithium disilicate liner. Maximum adhesive failures were found with lithium disilicate liner, and silicon dioxide-based liner group showed cohesive failures.
Keywords: Adhesive failure; cohesive failure; fractographic analysis; glass–ceramic liners; shear bond strength; zirconia.
Copyright: © 2019 The Journal of Indian Prosthodontic Society.