A study of stress distribution in maxillary central incisor restored with post-and-core crown by three dimensional finite element method

Objective: To investigate the role of dental collar and post length in determining the stress distribution indentin. Methods: A computer model of the central incisor was established and a 100N static load was applied at 45 degreeto the long axis of the tooth at incisal 1/3.The three dimensional finite element method was adopted to study the changesof stress in dentin when the post length varies in the tooth with a dental collar of 0mm and 2mm respectively. Results: Thedeeper the post was inserted into the root, the greater the tensile and Von Mises stress occoured in dentin. In case of thesame post length, the Von Mises stress decreased as the height of the dental collar increased. Conclusions: Decreasing thepost length and increasing the dental collar have the effect of reducing stress levels in dentin.