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J Indian Prosthodont Soc. 2019 Oct-Dec;19(4):338-344. doi: 10.4103/jips.jips_103_19. Epub 2019 Oct 10.

A comparative evaluation of the effect of liners on the shear bond strength of veneered zirconia block: An in vitro study.

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Department of Prosthodontics, Crown and Bridge and Implantology, Faculty of Dental Sciences, SGT University, Gurugram, Haryana, India.



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.


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.


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.


Adhesive failure; cohesive failure; fractographic analysis; glass–ceramic liners; shear bond strength; zirconia

[Available on 2020-10-01]
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