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Three-dimensional finite element analysis of weakened roots restored with different cements in combination with titanium alloy posts

引用

Chinese Medical Journal 2006年第4期119卷 305-311页

作者： LI Li-li WANG Zhong-yi BAI Zhong-cheng MAO Yong GAO Bo XIN Hai-tao ZHOU Bing ZHANG Yong LIU Bing Department of Prosthetics Stomatological Hospital Affiliated to Fourth Military Medical University Xi＇an 710032 China Department of Stomatology 306th Hospital of PLA Beijing 100101 China Department of Mechanical Engineering Xi＇an JiaoTong University Xi＇an 710000 China

Background It is very difficult and relatively unpredictable to preserve and restore severely weakened pulpless roots. To provide much needed benefit basis for clinical practice, this study was carried out to analyze the stress distribution in weakened roots restored with different cements in combination with titanium alloy posts. Finite element analysis （FEA） was employed in the study. Methods A pseudo three-dimensional model of a maxillary central incisor with flared root canal, theoretically restored with titanium alloy posts in combination with different cements, was established. The analysis was performed by use of ANSYS software. The tooth was assumed to be isotropic, homogenous and elastic. A load of 100 N at an angle of 45° to the longitudinal axis was applied at the palatal surface of the crown. The distributions of stresses in weakened roots filled with cements of different elastic modulus were analyzed by the three-dimensional FEA model. Results Several stress trends were observed when the stress cloud atlas obtained in the study was analyzed. With the increase of the elastic modulus of cements from 1.8 GPa to 22.4 GPa, the stress values in dentin decreased from 39.58 MPa to 31.43 MPa and from 24.51 MPa to 20.76 MPa （respectively, for maximum principle stress values and Von Mises stress values）. When Panavia F and zinc phosphate cement were used, the stress peak values in dentin were very small with no significant difference observed, and the Von Mises stress values were 20.87 MPa and 20.76 MPa respectively. On the other hand, maximum principle stress value and Von Mises stress value in cement layer increased with the increase of the elastic modulus of cements. Conclusions The result of this study demonstrated that elastic modulus was indeed one of the important parameters to evaluate property of the cements. Our three-dimensional FEA model study also found that the cement with elastic modulus similar to that of dentin could reinforce weakened root and re

关键词： weakened root cements finite element analysis stress distribution

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