Stress distribution in tooth resin core build-ups with different post-end positions in alveolar bone level under two kinds of load directions

Takashi Hatayama; Ayaka Chiba; Kimisuke Kainose; Masatoshi Nakajima; Keiichi Hosaka; Noriyuki Wakabayashi; Richard M. Foxton; Junji Tagami

doi:10.4012/dmj.2017-160

Stress distribution in tooth resin core build-ups with different post-end positions in alveolar bone level under two kinds of load directions

Takashi Hatayama, Ayaka Chiba, Kimisuke Kainose, Masatoshi Nakajima^*, Keiichi Hosaka, Noriyuki Wakabayashi, Richard M. Foxton, Junji Tagami

^*Corresponding author for this work

Centre for Oral, Clinical & Translational Sciences

Tokyo Medical and Dental University

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

This study aimed to evaluate influence of different post-end positions in alveolar bone level on stress distributions in resin-core build-up tooth under different load directions. Three-dimensional mathematical models of a root-filled mandibular premolar tooth were constructed. Resin post and core were built-up with six post lengths: 0, 1, 2, 3, 4, and 6 mm. Finite element analysis calculated stress distributions with oblique load of 400 N to buccal cusp 45 degree from buccal side or from lingual side. The 3 mm-post length (post-end position equal to cancellous bone level) caused highest equivalent stress of post-end compared with the shorter or longer post length. When change of load direction, the direction of maximum shear stress became completely opposite at mesiodistal cervical edge of core-part without a change of the magnitude. Changing shear stress direction would increase risk of debonding at mesiodistal cervical edge.

Original language	English
Pages (from-to)	474-483
Number of pages	10
Journal	Dental Materials Journal
Volume	37
Issue number	3
DOIs	https://doi.org/10.4012/dmj.2017-160
Publication status	Published - 1 Jan 2018

Keywords

Equivalent stress distribution
Fiber post
Load direction
Post-end position
Shear stress distribution

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title = "Stress distribution in tooth resin core build-ups with different post-end positions in alveolar bone level under two kinds of load directions",

abstract = "This study aimed to evaluate influence of different post-end positions in alveolar bone level on stress distributions in resin-core build-up tooth under different load directions. Three-dimensional mathematical models of a root-filled mandibular premolar tooth were constructed. Resin post and core were built-up with six post lengths: 0, 1, 2, 3, 4, and 6 mm. Finite element analysis calculated stress distributions with oblique load of 400 N to buccal cusp 45 degree from buccal side or from lingual side. The 3 mm-post length (post-end position equal to cancellous bone level) caused highest equivalent stress of post-end compared with the shorter or longer post length. When change of load direction, the direction of maximum shear stress became completely opposite at mesiodistal cervical edge of core-part without a change of the magnitude. Changing shear stress direction would increase risk of debonding at mesiodistal cervical edge.",

keywords = "Equivalent stress distribution, Fiber post, Load direction, Post-end position, Shear stress distribution",

author = "Takashi Hatayama and Ayaka Chiba and Kimisuke Kainose and Masatoshi Nakajima and Keiichi Hosaka and Noriyuki Wakabayashi and Foxton, {Richard M.} and Junji Tagami",

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AU - Hatayama, Takashi

AU - Chiba, Ayaka

AU - Kainose, Kimisuke

AU - Nakajima, Masatoshi

AU - Hosaka, Keiichi

AU - Wakabayashi, Noriyuki

AU - Foxton, Richard M.

AU - Tagami, Junji

PY - 2018/1/1

Y1 - 2018/1/1

N2 - This study aimed to evaluate influence of different post-end positions in alveolar bone level on stress distributions in resin-core build-up tooth under different load directions. Three-dimensional mathematical models of a root-filled mandibular premolar tooth were constructed. Resin post and core were built-up with six post lengths: 0, 1, 2, 3, 4, and 6 mm. Finite element analysis calculated stress distributions with oblique load of 400 N to buccal cusp 45 degree from buccal side or from lingual side. The 3 mm-post length (post-end position equal to cancellous bone level) caused highest equivalent stress of post-end compared with the shorter or longer post length. When change of load direction, the direction of maximum shear stress became completely opposite at mesiodistal cervical edge of core-part without a change of the magnitude. Changing shear stress direction would increase risk of debonding at mesiodistal cervical edge.

AB - This study aimed to evaluate influence of different post-end positions in alveolar bone level on stress distributions in resin-core build-up tooth under different load directions. Three-dimensional mathematical models of a root-filled mandibular premolar tooth were constructed. Resin post and core were built-up with six post lengths: 0, 1, 2, 3, 4, and 6 mm. Finite element analysis calculated stress distributions with oblique load of 400 N to buccal cusp 45 degree from buccal side or from lingual side. The 3 mm-post length (post-end position equal to cancellous bone level) caused highest equivalent stress of post-end compared with the shorter or longer post length. When change of load direction, the direction of maximum shear stress became completely opposite at mesiodistal cervical edge of core-part without a change of the magnitude. Changing shear stress direction would increase risk of debonding at mesiodistal cervical edge.

KW - Equivalent stress distribution

KW - Fiber post

KW - Load direction

KW - Post-end position

KW - Shear stress distribution

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Stress distribution in tooth resin core build-ups with different post-end positions in alveolar bone level under two kinds of load directions

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Keywords

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