Analysis of reliability of the strength of all-ceramic crown on mandibular first molar
10.3760/cma.j.issn.1002-0098.2010.04.010
- VernacularTitle:下颌第一磨牙全瓷冠强度可靠性的三维有限元分析
- Author:
Yan LI
1
;
Shao-Feng ZHANG
;
Jian-Jun CHEN
Author Information
1. 第四军医大学口腔医学院
- Keywords:
Probability;
All-ceramic crown;
Reliability
- From:
Chinese Journal of Stomatology
2010;45(4):233-236
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the reliability of all-ceramic crown on mandibular first molar under randomized biting force,and to explore the failure possibility of all-ceramic crown.Methods Finite element(FE)models of all-ceramic crown on mandibular first molar were established using the Algor FE software.All-ceramic crown was loaded at different occlusal areas and positions with random variables of biting force,and the reliability of all-ceramic crown was analyzed.Results The occlusal contact positions were located on the fossa,inclined surface and dental cusp.When the occlusal contact area was 0.4 mm~2,The reliability of all-ceramic crown on mandibular first molar were 100%(fossa),99%(inclined surfacee),and 97%(cusp)respectively.When the occlusal contact area was 1.5 mm~2,the reliabilities of all-ceramic crown on mandibular first molar were 100%(fossa),100%(inclined surfacee),and 99% (cusp)respectively.When the occlusal contact area was increased to 12.6 mm~2,the reliability of all-ceramic crown was 100%.Conclusions Premature occlusal contact and steep cusp inclination on all-ceramic crown on mandibular first molar will result in stress concentration and the crown will exhibit high failure probabilities.Chewing hard food is another contributing factor to the failure of all-ceramic crowns.
