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Factorial analysis of variables influencing mechanical characteristics of a post used to restore a root filled premolar using the finite element stress analysis combined with the Taguchi method
Author(s) -
Wang C. H.,
Du J. K.,
Li H. Y.,
Chang H. C.,
Chen K. K.
Publication year - 2016
Publication title -
international endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.988
H-Index - 119
eISSN - 1365-2591
pISSN - 0143-2885
DOI - 10.1111/iej.12499
Subject(s) - ferrule , von mises yield criterion , materials science , finite element method , premolar , taguchi methods , dentistry , orthodontics , composite material , structural engineering , medicine , molar , engineering , mechanical engineering , cable gland
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.