义齿稳固剂影响无牙下颌牙槽嵴应力分布的光弹性分析

Photoelastic analysis of mandibular edentulous alveolar bone with denture adhesives

目的:针对Atwood 3级无牙下颌牙槽嵴制作下半口义齿,分析其使用义齿稳固剂前、后,在正中咬合力加载时牙槽骨的应力分布情况。方法:应用三维光弹实验方法,在Atwood 3级无牙颌环氧树脂光弹模型上制作全口义齿,并在下半口义齿组织面内使用和不使用义齿稳固剂,进行正中咬合下应力加载冻结,比较其应力分布。结果:下半口使用义齿稳固剂后,正中咬合加载时,牙槽嵴顶和颊、舌侧应力分布更均匀,牙槽嵴顶较不使用稳固剂应力明显上升。结论:临床上对于Atwood 3级牙槽嵴患者,采用下半口义齿修复时,使用义齿稳固剂不仅可以增加义齿稳定性,还可使下颌后牙牙槽嵴的主副承托区应力分布更趋均匀,减少应力集中导致的局部压痛。

PURPOSE： To compare the stress distribution of supporting tissues in Atwood level 3 alveolar bones under the mandibular complete dentures with and without denture adhesives. METHODS： Photoelastie models of epoxy were fabricated according to the standard Atwood level 3 edentulous model. 1.5 kg force was vertically applied on the bite force loading device. After stress frozen, photoelastic model slices in posterior teeth area were observed and analyzed. RESULTS： When using denture adhesives, stresses distributed more adequately in the buccal and lingual side and the force of alveolar crest increased remarkably. CONCLUSIONS： To those with Atwood level 3 alveolar ridge and complete denture, denture adhesives can not only increase stability but also prevent local pressure under uneven stress distribution.