Chinese Journal of Tissue Engineering Research ›› 2011, Vol. 15 ›› Issue (17): 3143-3147.doi: 10.3969/j.issn.1673-8225.2011.17.025

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Three-dimensional finite element analysis of incisor flared root canal after repair with post-core system crown

Chen Lei1, Zhu Yi-nan2   

  1. 1Department of Stomatology of Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China
    2Department of Prosthodontics, Changsha Hospital of Stomatology, Changsha  410005, Hunan Province, China
  • Received:2010-12-01 Revised:2011-03-17 Online:2011-04-23 Published:2011-04-23
  • Contact: Zhu Yi-nan, Master, Physician, Department of Prosthodontics, Changsha Hospital of Stomatology, Changsha 410005, Hunan Province, China wy8874881@126.com
  • About author:Chen Lei★, Master, Professor, Department of Stomatology of Xiangya Hospital, Central South University, Changsha 410008, Hunan Province, China chenleidt@163.com
  • Supported by:

    the Natural Science Foundation of Hunan Province, No. 09JJ3029*

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Abstract:

BACKGROUND: At present, there are many clinical and experimental studies in the root after rehabilitation of flared root canal with post-core crowns; most of studies in the root rehabilitated by composite resin are restored with mental post-core but not fiber post-core.
OBJECTIVE: To investigate the stress distribution in the root after rehabilitation of flared root canal with post-core crowns.
METHODS: CT scanned the normal maxillary central incisor, and pieces of transaction pictures were obtained which output in BMP bitmap format. The model of the normal tooth, weakened root and that restored with post-core systems was established by Adobe Photoshop, Matlab 7.0 software. The data were input into the Ansysworkbench of the Ansys 11.0 software, to acquire the three-dimensional finite element models. The force was loaded on all of the models simulating clinical normal bite. The stress value and distribution in the root of three states that were restored by post-core of three materials were analyzed.
RESULTS AND CONCLUSION: After the weakened root repaired by light-solidified composite resin, Von mises stress value and distribution were similar to those of the normal root restored with post-core. There was only a little difference in high stress areas distribution among three states of root restored by fiber post-core system. It was the same with the distribution of the normal root without post-core. There was only a little difference in high stress areas distribution among three states of root restored by casting nichrome post-core system. It was different from the distribution of the normal root without post-core. The stress peak value of Von mises in the labial side of the cerival dentin of the weakened root had significantly increased, that had declined slightly after the weakened root repair, which was still higher than that of the normal root. It is indicated that the weakened root is repaired by the restoring materials whose elastic modulus near the dentin. The stress has decreased and the stress distribution has changed, that makes the stress distribution of the root similar to which of the normal root restored by post-core system. It is beneficial to the preservative therapy of the residual root. The fiber post is more appropriate for the prosthodontic treatment of the residual root.

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