International Journal For Multidisciplinary Research

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Evaluating The Effect of Varying Occlusal Thicknesses On The Fracture Resistance Of The Lithium Disilicate Endocrowns: An In-Vitro Study

Author(s) Joshi Hiral Bhaskarrai, Sudhir Meena, Narendra Padiyar U., Samani Khushbu Bhadresh
Country India
Abstract Purpose: To evaluate the effect of varying occlusal thickness on the fracture resistance of
lithium disilicate endocrowns
Material and Methods: Endocrown preparation was done on the mandibular first molar
typodont tooth and a metal die was obtained. A total of 30 specimens, were divided into three
groups with varying occlusal thickness of endocrowns; Group 1 (G1) = 2mm occlusal
thickness, Group 2 (G2) = 4mm occlusal thickness, and Group 3 (G3) = 5.5mm occlusal
thickness were fabricated. Specimens were placed on the Universal Testing Machine (UTM)
and subjected to axial load. The maximum force which led to the fracture of endocrowns was
recorded. One-way analysis of variance (ANOVA) was used for intergroup comparisons and
turkey’s pot hoc test for pairwise comparison was used.
Results: Maximum fracture resistance was seen in group 3 (G3) with an occlusal thickness of
5.5mm (4253.5 N), followed by group 2 (G2) with an occlusal thickness of 4mm (2876.2 N)
and least in group 1 (G1) with an occlusal thickness of 2mm (836.2 N). ANOVA for the
intergroup comparison showed a high statistically significant difference in fracture resistance
of lithium disilicate endocrowns between all the 3 groups (p<0.001). A statistically high
significant difference was found in the fracture resistance of lithium disilicate endocrowns via
post hoc Tukey’s test among all three groups.
Conclusion: The fracture resistance of endocrowns fabricated from lithium disilicate
increases with the increasing occlusal thickness of the endocrowns upon the axial loading.
Keywords Occlusal thickness, Fracture resistance, Lithium Disilicate, Endocrowns
Published In Volume 5, Issue 3, May-June 2023
Published On 2023-05-08
DOI https://doi.org/10.36948/ijfmr.2023.v05i03.2871
Short DOI https://doi.org/gr77qx
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