Effect of inlay, onlay, and endocrown restorations on the mode of failure and fracture resistance of endodontically treated maxillary premolar teeth. An in vitro study | ||||
| Egyptian Dental Journal | ||||
| Volume 70, Issue 2 - Serial Number 5, April 2024, Page 2031-2040 PDF (427.67 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2024.262743.2880 | ||||
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| Authors | ||||
Maha Nasr   1; Norhan Naief Abd-Elhaliem 2
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| 1Department of Endodontics, Faculty of Dentistry, The Egyptian Russian University, Badr City, Egypt. | ||||
| 2Department of Fixed Prosthodontics, Faculty of Dentistry, The Egyptian Russian University, Badr City, Egypt | ||||
| Abstract | ||||
| Aim: To assess the impact of various restoration designs on the fracture resistance and failure modes of maxillary premolars that had endodontic treatment. Methods: Eighteen extracted upper premolars were used. All teeth were endodontically treated, root canals were shaped with Protaper Next files up to #X3 and obturated with matching gutta percha cones. Afterwards, teeth were randomly assigned to 3 groups according to the restoration design. Group1, EC: Endocrowns, Group2, O: onlays and Group3, I: inlays. All restorations were fabricated from IPS e-max press. Samples underwent thermocycling before compressive stress was applied at a 30-degree angle to their long axes. Data were collected and analyzed statistically by ANOVA and Tukey post-hoc tests. Results: the inlay group failed at a significantly lower load compared to both onlay group and Endocrown group, (p=0.032). Regarding the failure mode, statistical analysis revealed a significant difference amongst groups. All samples in “EC” group (100%) had Fractured tooth & restoration above CEJ, all samples in “I” group (100%) had Fractured tooth & restoration below CEJ, while in “O” group, 66.666% of samples had Fractured tooth & restoration above CEJ while 33.333% showed only a fractured restoration. Conclusion: Compared to inlays and onlays, endocrowns had the highest mean fracture resistance; however, the difference was not significant when compared to onlays. When compared to both inlays and endocrowns, onlays had the failure mode that was most favorable. Recommendation: Based on those findings, onlays could be suggested as a final restoration for maxillary premolars following endodontic therapy. | ||||
| Keywords | ||||
| Endodontically treated premolars; lithium disilicate; Fracture Resistance; failure mode | ||||
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