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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

Research output: Contribution to journalArticle

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

Original languageEnglish
Pages (from-to)474-483
Number of pages10
JournalDental Materials Journal
Volume37
Issue number3
DOIs
Publication statusPublished - 1 Jan 2018

King's Authors

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.

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