C H Wang1,2, J K Du1,2, H Y Li3, H C Chang4, K K Chen1,2. 1. Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan. 2. School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. 3. Department of Mold and Die Engineering, National Kaohsiung University of Applied Science, Kaohsiung, Taiwan. 4. Department of Biomedical Engineering, National Cheng Kung University, Tainan, Taiwan.
Abstract
AIMS: To identify the contributions of various mechanical factors related to cast posts in a root filled tooth by integration of finite element analysis and the Taguchi method. The investigated factors included post-length (Post-L), post-diameter (Post-D), ferrule height (Ferrule-H) and periodontal bone loss (Bone-H). METHODOLOGY: Three-dimensional finite element models of a mandibular premolar were developed to simulate a root filled tooth. For each investigated factor, three levels and values were selected, and based on a Taguchi orthogonal array, nine models were established. An inclination load of 100 N was applied on the buccal cusp tip, and the dentine peak von Mises stress was used as the evaluation index. RESULTS: Among the four investigated factors, Bone-H was the predominant mechanical factor, with a contribution of more than 97%. Among the other three controllable factors of post-design, Post-D was the primary contributing factor and was almost five times more substantial than the least contributing factor, Ferrule-H. CONCLUSION: Bone-H was the predominant factor influencing the stress of the dentine on a post-restored root filled tooth, followed by the Post-D, Post-L and Ferrule-H. For patients with severe periodontal bone loss, a large post-diameter is essential for endodontic post-restoration treatment.
AIMS: To identify the contributions of various mechanical factors related to cast posts in a root filled tooth by integration of finite element analysis and the Taguchi method. The investigated factors included post-length (Post-L), post-diameter (Post-D), ferrule height (Ferrule-H) and periodontal bone loss (Bone-H). METHODOLOGY: Three-dimensional finite element models of a mandibular premolar were developed to simulate a root filled tooth. For each investigated factor, three levels and values were selected, and based on a Taguchi orthogonal array, nine models were established. An inclination load of 100 N was applied on the buccal cusp tip, and the dentine peak von Mises stress was used as the evaluation index. RESULTS: Among the four investigated factors, Bone-H was the predominant mechanical factor, with a contribution of more than 97%. Among the other three controllable factors of post-design, Post-D was the primary contributing factor and was almost five times more substantial than the least contributing factor, Ferrule-H. CONCLUSION: Bone-H was the predominant factor influencing the stress of the dentine on a post-restored root filled tooth, followed by the Post-D, Post-L and Ferrule-H. For patients with severe periodontal bone loss, a large post-diameter is essential for endodontic post-restoration treatment.
Authors: M Naumann; M von Stein-Lausnitz; M Rosentritt; C Walter; H Meyer-Lückel; G Sterzenbach Journal: Clin Oral Investig Date: 2018-02-06 Impact factor: 3.573
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