Assessment of marginal adaptation and fracture resistance of endocrown restorations utilizing different machinable blocks subjected to thermomechanical aging

• DOI: 10.1111/jerd.12396
• Publication Date: 2018-08-16T12:02:32Z
• Authors: Doaa Taha; Sebastian Spintzyk; Ahmed Sabet; Marwa Wahsh; Tarek Salah
• Keywords: Cementation (geology); Lithium disilicate

Abstract Objective This in vitro study was conducted to assess the marginal adaptation and fracture resistance of computer aided design/computer manufacturer (CAD‐CAM) fabricated endocrowns restoring endodontically treated molars using different machinable blocks with thermomechanical loading protocols. Materials Methods Devitalized mandibular were prepared a standardized way divided into 4 groups ( n = 10) receive CAD/CAM four materials (Lithium disilicate ceramics, polymer infiltrated zirconia‐reinforced lithium silicate ceramics resin nanoceramics. Marginal gaps (µm) measured stereomicroscope before cementation after cementation. After aging, gap measurements repeated, then test performed. Two‐way analysis variance (ANOVA) Tukey HSD multiple comparisons used effect material on before, cementation, aging. One Way ANOVA resistance. Results The difference between values tested statistically insignificant but significant increase Cerasmart showed highest mean load value (1508.5 ± 421.7N) than Vita Enamic Celtra Duo. Conclusion vertical readings within limits clinically acceptable standards. Resin nanoceramics followed by favoring their use for endocrown restorations. Clinical Significance mechanical behavior ceramic varies variation structure properties. Accordingly, further investigation is always needed explore biomechanical recent when as clinical trials.