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. (3rd August 2015)

• Record Type: Journal Article
• Authors: Wang, C. H.; Du, J. K.; Li, H. Y.; Chang, H. C.; Chen, K. K.
• Is Part Of: International endontic journal. Volume 49:Number 7(2016:Jul.)
• Page Start: 690
• Page End: 699
• Publication Date: 2015-08-03
• Subjects: endodontically treated tooth -- finite element method -- post -- stress analysis -- Taguchi method; Endodontics -- Periodicals; 617.6342
• DOI: 10.1111/iej.12499
• Languages: English
• ISSNs: 0143-2885

Abstract

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.