Evaluating Fracture Resistance And Failure Modes Of Root Filled Teeth Restored With CAD/CAM-Fabricated Post And Core
Received 17 June 2019
Accepted for publication 26 September 2019
Published 14 November 2019 Volume 2019:11 Pages 349—355
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Professor Christopher E. Okunseri
Reem Alkhatri,1 Abdul Rahman Mohammed Saleh,1 Waad Kheder2
1Department of Restorative Dentistry, Ajman University, Ajman, United Arab Emirates; 2College of Dental Medicine, University of Sharjah, Sharjah, United Arab Emirates
Correspondence: Abdul Rahman Mohammed Saleh
Ajman University, PO Box 346, Ajman University Street, Aljurf, Ajman, United Arab Emirates
Tel +971 4 50228 3188
Fax +971 4 670 56874
Objective: The aim of this study was to measure the fracture resistance and failure modes of root-filled teeth restored with three different computer-aided design/computer-aided manufacturing (CAD/CAM)-fabricated post and core assemblies.
Methods: Thirty extracted intact maxillary central incisors were used in the study, and the teeth were endodontically treated and sectioned to a root length of 16 mm. The samples were divided into three groups (n = 10) according to the mean of the dimensions at the cervical portion of the root. The posts and cores were fabricated with CAD/CAM technology using metal, zirconia, and polymer-infiltrated ceramic network (PICN) material. The posts were luted using resin cement, and then, metal crowns were fabricated, cemented, and then subjected to a compression to determine the fracture resistance force. Fracture of the post and core or fracture of the root above the level of the acrylic resin was considered as a favorable fracture, while nonfavorable fractures were those where the root fracture occurred below the level of the acrylic resin. Statistical analysis was carried out using SPSS software, and one-way analysis of variance was used to analyze root fracture resistance in Newton. The number of failure modes, post–core fractures and/or root fractures was calculated. The differences between study groups were revealed using the chi-square test.
Results: The results of ANOVA revealed a nonsignificant difference in the resistance to fracture among the study groups (P = 0.114). The failure modes were nonfavorable for all metal and zirconia samples and seven PICN samples. However, three PICN samples exhibited a favorable represented by core fracture without root fracture.
Conclusion: There was no significant difference between metal and zirconia samples in terms of nonfavorable fracture, while few PICN samples exhibited a favorable fracture. PICN material can be used in the fabrication of post and core assemblies using CAD/CAM.
Keywords: CAD/CAM, cast post, PICN, failure mode
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