摘要
目的:应用有限元法研究上颌中切牙采用不同修复方式时牙本质和全瓷冠的应力变化情况,并分析对组织应力大小和分布的影响。方法:采用螺旋CT扫描,运用Mimics软件、Ansys软件建立3种不同牙体量上颌中切牙的三维有限元模型,分别采用全瓷冠修复和纤维桩全瓷冠修复,模拟45°切龈向咬合加载,记录牙本质、全瓷冠的Von Mises应力和最大拉应力。结果:相同牙体量时,上颌中切牙采用纤维桩全瓷冠修复后牙本质和全瓷冠的应力值均小于仅采用全瓷冠修复时的应力值,而应力分布基本相似。结论:全瓷冠联合纤维桩修复可有效降低上颌中切牙牙本质和全瓷冠的应力峰值,并且不改变原有应力分布模式,有利于降低牙折和修复失败的风险。
Objective：To study the stress at maxillary central incisor restored with different methods using finite element models, and to analyze the role of restoration methods in determining stress distribution over the dentin and all-ceramic crown. Methods： Three dimensional finite element models of maxillary central incisor with different remaining tooth structure were established with spiral CT, Mimics and Ansys. The maxillary central incisors were restored with all-ceramic crown and fiber post all-ceramic crown, respectively. A 100N static load was applied at 45 degree to the long axis of the tooth at incisal 1/3. The Von Mises stress and maximal tensile stress of dentin and all-ceramic crown were recorded. Results：With the same remaining structure, smaller stress level was recorded in dentin and all-ceramic crown of maxillary central incisor restored with fiber post all-ceramic crown as compared with those restored with all-ceramic crown. Similar distribution of the stress was found between the two groups. Conclusion： Combination of all-ceramic crown and fiber post can reduce the stress level in dentin and all-ceramic crown of maxillary central incisor effectively but does not produce any change in the stress pattern, which appears helpful to reduce the risk of tooth break and prosthesis failure.
出处
《广州医学院学报》
2011年第2期106-111,共6页
Academic Journal of Guangzhou Medical College
关键词
纤维桩
全瓷冠
上颌中切牙
三维有限元
fiber post
all-ceramic crown
maxillary central incisor
three dimensional finite element
