STRESS ANALYSIS AND FAILURE RISK OF ENDODONTICALLY TREATED MOLARS RESTORED WITH THREE CAD/CAM MATERIALS OVER COMPOSITE CORE AND GLASS FIBER INSERTION

Document Type : Original Article

Authors

1 Lecturer of Fixed Prosthodontics, Faculty of Dentistry, Alexandria University

2 Assistant Professor of Dental Biomaterials, Faculty of Dentistry Alexandria Univesity

3 Lecturer of Oral and Maxillofacial Radiology, Faculty of Dentistry Alexandria University

Abstract

Objective: Evaluating the stress distribution pattern and failure risk of post retained crown restorations using e.max CAD), Lava ultimate, and ZirCAD restorative crown materials.
Materials & methods: Endodontically treated human molar with fiber post and composite core was digitized after CBCT, CAD software (Catia) were used to create FEA model imbedded in alveolar bone and 3 crown material: (1) EM; (2) LU; (3) ZC, A static components of 600 N loads were applied on the occlusal surface , analysis program by ANSYS 2021 were used for Finite element analysis (FEA) , calculated the VMs distributions values and the total deformation values to detect the failure risk.
Results: There was difference on both VMs values at restorative crown and the remaining tooth structure and the surrounding tissues. The results showed that the greater elasticity modulus of ZC restorative material was been proportional to the higher VMs distribution values. While the lower elasticity modulus of LU was proportional to the low VMs values and remaining tooth structure. VMs values of stress distribution on composite resin core and fiber post in the ZC model were lower than LU restorative material. For the total deformation values, the risk of failure of the three models was nearly the same.
Conclusions: LU showed lower stress distribution profile and superior mechanical response that grants LU to be used as a good dental restoration.

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Egyptian Dental Journal
Volume 69, Issue 2 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
April 2023
Pages 1529-1544

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