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Volume 36 , Issue 2
March/April 2023
Pages 189–193

Evaluation of Marginal and Internal Fit of CAD/CAM Endocrowns with Different Cavity Tapers

Mohammadreza Hajimahmoudi, MSc, DDS/Sasan Raseipour, MSc, DDS/Mohammad Mroue, DDS/Safoura Ghodsi, MSc, DDS

PMID: 33625391
DOI: 10.11607/ijp.6877

Purpose: To evaluate the effect of cavity tapering on marginal and internal adaptation of endocrowns fabricated from two different ceramic materials. Materials and Methods: Two mandibular molar model teeth were prepared with two different cavity tapers (5 and 10 degrees). A total of 40 endocrowns (four groups of 10 each) were milled using lithium disilicate and zirconia-reinforced lithium silicate ceramics for each cavity taper. The marginal and internal adaptation of endocrowns were measured by a stereomicroscope (×30) at 18 different points. The data were statistically analyzed using independent t test (P < .05). Results: A statistically significant difference was shown among the tested groups at 10 degrees of taper (P < .001). At 5 degrees of taper, the difference was insignificant. The greatest internal gap was observed at the pulpal floor in all tested groups. Conclusion: All materials had clinically acceptable internal and marginal gaps; however, lithium disilicate ceramic had significantly better adaptation at 10 degrees of taper.

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