Establishment Of Three-dimensional Finite Element Model And Stress Analysis Of Root Of The Maxillary Second Premolar

Objective:The aim of applies the three-dimensional finite element analysis techniques,the maxillary second premolar root canal and root surface curvature of the three-dimensional finite element basic model was established. Under the specific load power with changes of the root canal size and the canal surface curvature to analysis root of a tooth stress distribution situation and root fracture-related factors, and simulated oral chewing movement was obverved under dynamic loading and distribution of the root of the force, in order to better prevent the occurrence of clinical root fracture and provide experimental evidence. Methods:One extracted human maxillary second premolar with a single root and without caries were selected, by measuring dimensions meet Wang-huiyun reported the standard of Chinese people within the tooth. By using CT scan, and other related software by Mimics into the Ansys finite element software,The maxillary second premolar three-dimensional finite element basic model was reestablished. With changes of the root canal size and root surface curvature on the basic model to observe the influence of the root canal stress distribution and the root fracture. Results:1. The maxillary second premolar basic model was established with the three dimensional finite element. 2.With the more of the root canal thickness decrease, the more of the distribution of stress on root canal wall is obvious. At the same model, the maximum stress located on the coronal 1/3 of the root, the stress from the root canal orifice to root tip reduce gradually and the distribution of the stress from the palatal to the mesio-distal.; 3.Root surface curvature changes affect the maximum stress of root canal regional distribution.4.With dynamic loading of the time between the 0.15s to 0.30s, root canal wall by the force size and distribution change over time significantly. Conclusion:1.Change the root canal size influence the root wall stress level especially on the coronal 1/3 of the root, clinical root canal treatment should be to completely remove the infected tissue and to try to avoid over-cutting of dentin thickness, root canal preparation should be no more than 1/3 of the original root canal is relatively security; 2.By varying the root surface curvature to analyzing the distribution of the stress mainly focus on the coronal 1/3 of the root, the same root canal size, With the increased of root surface curvature, the fracture susceptibility also increased; 3.Study with the dynamic loading, the simulation of the force and distribution of root canal is feasible.