摘要
目的:研究不同牙体存留壁厚度及髓室底厚度的磨牙桩冠修复后,存留牙体组织的应力大小及分布状况,为临床牙体大面积缺损的桩冠修复提供理论依据。方法:对不同牙体存留壁和髓室底厚度进行量化分级,分别建立上下颌第一磨牙牙体缺损的量化分级三维有限元模型。其中牙体预备后存留壁厚度分别设定为1mm、1.5mm及2mm;髓室底厚度分别设定为0.5mm、1mm及2mm。计算分析三种牙体缺损状况时存留牙体组织的应力及分布状况。结果:存留壁的应力值是随着存留壁厚度的增加而减小;髓室底的应力值是随着髓室底厚度的增加而增大。结论:牙体预备后的存留壁厚度不小于1mm时,桩冠修复后牙体组织的应力值均小于牙本质的抗力强度。髓室底的薄厚对桩冠修复后髓室底的抗折强度无不利影响。
Objective:To investig atestress distribution of the remaining tissue of teeth based on two variables:different thickness of remaining walls and that of floor of pulp chamber, expecting theoretical support for clinical restoration of defected teeth using post-core crowns. Methods: Different remaining walls and pulp chamber were classified by their thick- ness, and 3-D finite element models were established according to the classification of different defected molar. In this ex- periment, the thickness of rem...
出处
《口腔颌面修复学杂志》
2010年第2期81-83,共3页
Chinese Journal of Prosthodontics
关键词
应力
存留壁
髓室底
桩冠
stress
remaining walls
pulp floor
post crown
