A finite element analysis of stress distribution in roots with different types of post systems

Fujino Oshima, DDS, Daizo Okada, DDS, PhD, Reiko Ogura, DDS, PhD, Chiharu Shin, DDS, PhD, Yoji Ueda, DDS, PhD, Tasuku Inagaki, DDS, PhD, Rie Fujita, DDS, PhD, and Hiroyuki Miura, DDS, PhD

Fixed Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan

Purpose: The purpose of this study was to evaluate the stress distributions of various post and core systems and determine which post and core system contributes to preventing stress concentration and root fracture.
Materials and Methods: Following seven models were fabricated; a natural tooth model (NT), a vital tooth with preparation for a crown model (VT), a cast metal post and core model (CP), and composite resin core with four types of prefabricated post models. These prefabricated post materials were stainless steel post (SP) and three types of glass fiber posts (FP3, FP29, FP45) with different Young’s modulus. In all models, stress distribution during function was calculated.
Results: Around base of the post and end of the post, SP and CP gave rise to higher stress concentration and FP3, its Young’s modulus was the lowest among all types of posts, is the exhibited the lowest stress concentration.
Conclusion: Within the limitation of this study, FP3 was found to be the most suitable candidate.
(Asian Pac J Dent 2016; 16: 1-7.)
Key Words: nonlinear finite element analysis, post and core, root fracture, von Mises stress, Young’s modulus