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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.
- Authors
Takashi HATAYAMA; Ayaka CHIBA; Kimisuke KAINOSE; Masatoshi NAKAJIMA; Keiichi HOSAKA; Noriyuki WAKABAYASHI; FOXTON, Richard M.; Junji TAGAMI
- 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.
- Subjects
DENTAL resins; BICUSPIDS; DENTAL extraction; PROSTHODONTICS; MANDIBULAR prosthesis
- Publication
Dental Materials Journal, 2018, Vol 37, Issue 3, p474
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2017-160