内收力对不同牙槽骨高度后牙影响的三维有限元分析  

Three-dimensional finite element analysis of the effect of internal resorption force on posterior teeth with different alveolarboneheights

作　　者：孙志涛 孙阳 宋宇 SUN Zhitao;SUN Yang;SONG Yu(Rizhao Central Hospital,Rizhao 276801)

机构地区：[1]山东省日照市中心医院口腔科,276801 [2]山东省日照市人民医院口腔科,276801 [3]青岛市口腔医院,276801

出　　处：《现代口腔医学杂志》2024年第2期118-122,共5页Journal of Modern Stomatology

基　　金：山东省日照市自然科学基金青年基金项目(RZ2022ZR27)。

摘　　要：目的本研究通过对正常牙槽骨组、轻度吸收组、中度吸收组分别施加不同大小的矫治力,探讨最合适的矫治力系统。方法在建立正常牙槽骨高度(正常组)的基础上,通过删减单元格获得后牙牙槽骨高度水平均衡降低2mm、4mm的模型(轻度吸收组、中度吸收组),对其施加矫治力大小分别为60g、80g、100g、150g,分析各后牙组牙的牙周膜初应力及牙齿初始总位移的分布情况。结果随着矫治力的增大,后牙组牙总位移增加,牙周膜VonMises应力逐渐增大;当牙槽骨吸收4mm时,随着矫治力的增大,应力值和牙齿初始总位移值显著增加。结论对于伴有轻度牙槽骨丧失的患者,应当适当减小矫治力;中度牙槽骨丧失患者,应当显著减小矫治力。Objective In this study,the most appropriate orthodontic force system was obtained by applying different magnitudes of orthodontic force to the normal alveolar bone group,the mild resorption group,and the moderate resorption group,respectively.Methods A normal alveolar bone height(normal group)was established.By deleting the bone tissues,the alveolar bone heights of the posterior teeth were reduced by 2 mm and 4 mm to obtain mild resorption group and moderate resorption group,on which orthodontic force sizes were applied at 60 g,80 g,100 g,and 150 g,respectively.The distributions of the initial periodontal membrane stresses and the initial total tooth displacements of the teeth in each posterior group were analyzed.Results As the orthodontic force increased,the total displacement of the teeth in the posterior group increased,and the periodontal membrane Von Mises stress gradually increased.When the alveolar bone by resorbed by 4 mm,the stress and the initial total displacement of the teeth increased significantly with the increase of orthodontic force.Conclusion The orthodontic force should be appropriately reduced in patients with mild alveolar bone loss,and significantly reduced in patients with moderate alveolar bone loss.

关 键 词：正畸力 内收前牙 牙槽骨 有限元 

分 类 号：R783.5[医药卫生—口腔医学]