Comparative Analysis of Marginal Fit and Fracture Resistance in CAD-CAM Lithium Disilicate and Pre-processed Composite Endocrowns: An In Vitro Study.

Abstract

Aim and background: This study aimed to determine the optimal finish line and material criteria for optimal marginal fit and fracture resistance in endocrowns. The impact of two preparation designs on endocrowns made from computer-aided design and computer-aided manufacturing (CAD-CAM) lithium disilicate and pre-processed CAD/CAM composite was compared.

Materials and methods: In a randomized 3-arm trial involving 42 mandibular molars, two marginal configurations (with and without chamfer finish lines) were evaluated for each material group. Marginal fit was assessed pre- and post-cementation using scanning electron microscope, and fracture resistance was tested with a universal testing machine. Student t-test was used to compare within group differences and ANOVA with Tukey test was used to compare intergroup differences. The significance level was set at 0.05.

Results: Edelweiss CAD/CAM blocks demonstrated the least marginal gap pre- and post-cementation, and superior fracture resistance compared to lithium disilicate and HIPC composite resin. Finish lines significantly affected marginal adaptation in all groups. Fracture resistance differences between designs within the same group were not statistically significant.

Conclusion: The CAD/CAM composite proved effective for endocrown restorations, with finish lines impacting marginal adaptation but not fracture resistance. Edelweiss CAD/CAM blocks showed superior performance in both aspects, suggesting their suitability for such restorations.

Clinical significance: The study highlights the clinical significance of using Edelweiss CAD/CAM blocks for endocrown restorations, demonstrating superior marginal fit and fracture resistance. Clinicians can enhance restoration longevity by selecting appropriate materials and preparation designs, particularly the use of finish lines, to optimize marginal adaptation without compromising fracture resistance. How to cite this article: Singh MV, Sarfaraz H, Lampl S, et al. Comparative Analysis of Marginal Fit and Fracture Resistance in CAD-CAM Lithium Disilicate and Pre-processed Composite Endocrowns: An In Vitro Study. J Contemp Dent Pract 2024;25(8):732-739.