下颌骨颊舌向骨宽度的三维有限元分析

背景：由于牙列缺损、牙列缺失、牙周病、创伤、肿瘤等因素，很多患者面临着种植区颌骨颊舌向宽度不足这一问题，目前学者们对种植体周适宜的颊舌向骨宽度尚无一致的结论。目的：利用三维有限元法探寻下颌骨种植体一骨界面应力分布情况，以评定出适宜种植所需下颌骨颊舌向骨宽度。方法：用三维有限元分析法，分别对Ⅰ类、组织构建：口腔组织构建；牙种植体；颌骨宽度；应力分布；三维有限元分析；Ⅰ类下颌骨；Ⅲ类下颌骨；国家自然科学基金类骨质类型所含种植体的下颌骨模型（种植体颈部区域颊舌向骨宽度1，1．5，2，2．5，3，3．5mm）施加200N垂直和斜向60。两种方向的集中载荷，并对种植体骨界面进行应力分析。结果与结论：种植体两侧各有2mm以上的骨量即可使种植体骨界面的应力达到较为理想的状态。斜向载荷状况下产生的应力远大于垂直向载荷下产生的应力。结果表明种植体周颊舌向拥有适当的骨量对种植体骨界面应力分布有显著影响，临床种植方案设计时应尽量避免或减小斜向载荷的出现。

Three-dimensional finite element analysis of buccal-Iingual mandibular width

METHODS： Classes I and II mandible implant models （the buccal-lingual width of implant neck region was 1, 1.5, 2, 2.5, 3 and 3.5 mm） were loaded with 200 N forces vertically and at 60^0 oblique. Then, the stress and strain in the implant-bone interracial were analyzed. RESULTS AND CONCLUSION： Almost 2 mm or more than 2 mm of mandible bone width could result in good stress distribution in implant-bone interface. The stress distribution of oblique loading was much greater than that of vertical loading. Proper quantity of peri-implant mandibular width is good for stress distribution in implant-bone interface. In the clinical treatment, the oblique loading should be avoided or reduced.