Influence of Deep Marginal Elevation on Fracture Resistance of Endocrown Restorations Constructed from Two Cad/Cam Blocks (An In-Vitro Study) | ||
| Egyptian Dental Journal | ||
| Volume 71, Issue 4, October 2025, Pages 3177-3189 PDF (901.13 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/edj.2025.395843.3515 | ||
| Authors | ||
| omaima sayed Ahmed* 1; Ahmed Mohamed Bakry2; shams waz3 | ||
| 1fixed prosthodontic ELnahda university | ||
| 2Professor Oral and Maxillofacial Radiology Faculty of Dentistry Minia Univeristy | ||
| 3Associate Professor of Fixed Prosthodontics, Faculty of Dentistry, Minia University, Minia, Egypt. | ||
| Abstract | ||
| ABSTRACT 1. Objective: To assess the impact of fracture resistance on the marginal adaptation of endodontically treated teeth restored with endocrowns fabricated from two CAD/CAM ceramics in an in vitro model. 2. Materials and Methods: Forty sound mandibular first molars underwent endodontic treatment and were prepared for endocrowns with a butt-joint occlusal edge and a mesial proximal box. The participants were categorized into two groups (n=20 each) according to ceramic type: Group H (hybrid ceramic) and Group L (LDS ceramic). Each group was further partitioned into subgroups E (exhibiting marginal elevation) and N (lacking marginal elevation), with 10 specimens each. The endocrowns were affixed with dual-cured self-adhesive resin cement and subjected to 5000 thermal aging cycles ranging from 5°C to 55°C. All specimens were thereafter submitted to a fracture resistance test using a universal testing equipment. The gathered data was documented, organized, and submitted for statistical analysis. 3. Results: The LDS ceramic subgroup with deep marginal elevation (LE) exhibited considerably greater fracture resistance compared to all other evaluated subgroups (P < 0.001). 4. Conclusion: In comparison to LDS IPS E.max, hybrid ceramics, both with and without marginal elevation, demonstrate enhanced fracture resistance. | ||
| Keywords | ||
| Keywords: CAD/CAM Technology; Ceramics; fracture resistance; Endocrown; Endodontically Treated Teeth | ||
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