Fracture Resistance of Endodontically Treated Mandibular Molars Restored With Two Endocrown Designs (An In-Vitro Study)

Document Type : Original Article

Authors

1 Department of Fixed Prosthodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt; Guest Researcher, Oral Technology Department, Bonn, Germany

2 Department of Endodontics, Faculty of Dentistry, Ain Shams University, Cairo, Egypt

Abstract

Aim: To evaluate the effect of two endocrown designs on the fracture resistance of endodontically treated mandibular molars.
Materials and methods: Fourteen mandibular molars were endodontically treated and randomly divided into two groups according to the endocrown design; group (A) Axial extension (n=7) and group (B) Circumferential extension (n=7). Endocrown preparation was done followed by CAD/CAM endocowns design and fabrication using lithium disilicate glass ceramics. Endocrowns were cemented using a standardized protocol. All samples were subjected to fracture resistance test using a universal testing machine and the maximum loaded was recorded. Statistical analysis was performed using One-Way ANOVA and significance level was set at 0.05.
Results: Endodontically treated mandibular molars with axial extension endocrowns showed significantly higher fracture resistance than those with circumferential extension.
Conclusions: Axial extension endocrown design is recommended to restore endodontically treated mandibular molars.

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