Study On Stress Distribution Of Weakened Root Restored With Different Post Systems Combined With Different Cements

Restoration of endodontically treated teeth with flared root canal and thin walls near the cervical part is frequently a challenge for dentists. It becomes especially complex when the involved teeth have previously undergone treatment for caries, fractures, endodontic-access preparation, canal instrumentation, or other idiopathic causes. These problems result in loss of tooth structure and consequent reduction in tooth resistance to myriad of intra-oral forces. Currently, restoration of weakened roots focuses on dowel -post - crown restoration, and the retention is provided by the post cemented with different luting agents. However, tooth fracture still often occurs, which is one of the most serious results with weakened root restored with a post. How to improve the resistance of the teeth has been the research interest for many doctors nowadays. However, many previous studies focused on analysis of a single factor, such as diameter of the post, shape, materials, or the type of cements. They did not systematically analyze effect of multi-factors on the restoration teeth. Meanwhile, many studies focused on stress analysis of normal residual root, with very few reports on stress analysis of weakened roots.A three-dimensional model of weakened root restored with post-retained crown was established for the first time in this study. The distribution of stress in...