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Dynamic finite element analysis of three ferrule designs in post crown under impact loading

ZHANG Xin-chun1,CHEN Hui-zhi2,TENG Wei1,WANG Yan1,FAN Yu-bo3,JIANG Wen-tao3 1Guanghua School of Stomatology,Sun Yat-sen University,Guangzhou 510060,China;2Department of Stomatology,First Affiliated Hospital of Guangdong Pharmaceutical University,Guangzhou 510080,China;3Biomechanics Engineering Laboratory,Sichuan University,Chengdu 610065,China  
Objective To investigate the stress distribution in three ferrule designs in a maxillary central incisor restoration using PFM crown with post,and evaluate the biomechanical mechanism of the ferrule effect in the post crown by 3D finite element dynamic analysis.Methods The 3D finite element model of a maxillary central incisor restored with post and PFM crown was established.By simulating three types of ferrule effect [crown wrapping dentine(A),core collar wrapping(B),and contrabevel(C)] under dynamic loading,the dentin stress was analyzed.Results During dynamic loading,the stress distribution tended to increase from the cervical part to root middle and radical part of the tooth,and greater high stress area was found around the apex of the post,where the peak stress was observed value.The stress of the labial dentin of the root inferior segment increased obviously.The high stress areas were invariable at every loading step during dynamic loading.The peak stress was σvonAσvonC,σvonBσvonC,(P0.05).The contrabevel had the minimal effect in decreasing the peak stress.Conclusions When the ferrule is 2 mm,the ferrule effect maintained by crown wrapping cervical dentine(A) and core collar wrapping(B) is greater than that maintained by contrabevel(C),but there is no significant difference between A and B.The post with higher elastic modules may cause restore failure due to the high stress at the post apex and labial dentin.
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