The Impact of Various Coronal Restoration Construction Techniques on the Fracture Resistance of Posterior Teeth: An In Vitro Study | ||
| Egyptian Dental Journal | ||
| Volume 71, Issue 4, October 2025, Pages 3321-3328 PDF (608.44 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/edj.2025.406071.3561 | ||
| Authors | ||
| Shaimaa Moustafa Rohym1; Hanaa Sayed Nassar* 2 | ||
| 1Lecturer, Department of Conservative Dentistry, Faculty of Oral and Dental Medicine, Ahram Canadian University | ||
| 2Associate Professor, Department of Fixed Prosthodontics, Faculty of Oral and Dental Medicine, Ahram Canadian University | ||
| Abstract | ||
| Objective: To determine the impact of different onlay construction methods (direct-indirect versus indirect CAD/CAM method) on the resistance to fracture of posterior teeth. Materials and Methods: 30 intact maxillary permanent molars were randomly allocated into two groups, each including 15 specimens. All the teeth were prepared into Class II onlay restorations. Group C was restored with direct/indirect Ecosite bulk fill composite, while Group O was restored with Shofu CAD/CAM composite blocks. All samples were prepared and preserved in distilled water for one day. A fracture test was done by applying occlusal compressive load after completion of thermomechanical aging. Data were collected and statistically analysed. Results: The Indirect Shofu group exhibited greater mean fracture load values compared to the Direct-Indirect group. This was statistically significant, as indicated by ANOVA and Tukey’s post-hoc testing (p = <0.0001 < 0.05). Conclusion: Shofu composite blocks exhibited statistically significant superior fracture resistance compared to direct-indirect Ecosite Bulk Fill Composite. Clinical significance: Indirect CAD/CAM onlay restorations for permanent molars outperformed direct-indirect resin composite onlays. | ||
| Keywords | ||
| CAD/CAM onlays; direct-indirect resin composite restoration; fracture resistance | ||
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