集中载荷下下颌后牙区种植体直线排列与成角排列的应力分析  

Stress analysis of the staggered and straight placement of implants in the mandibular posterior region under the localized load

作　　者：李影[1] 周延民[1] 周振平[2] 王馨[3] 

机构地区：[1]吉林大学口腔医学院种植中心,长春130041 [2]吉林大学机械科学与工程学院 [3]黑龙江省医院口腔科

出　　处：《中华口腔医学杂志》2007年第6期365-367,共3页Chinese Journal of Stomatology

摘　　要：目的研究集中载荷下下颌后牙区种植体直线排列与成角排列的应力分布。方法选择一具牙体缺失的成人离体下颌骨标本,CT 扫描建立二维坐标,根据坐标画点再用曲线连点形成下颌骨轮廓。采用三维有限元的方法研究集中载荷下种植体-骨界面应力分布特点和变化规律。结果垂直载荷下,粗直径种植体直线排列时应力峰值减低(最低为3.70 MPa),标准直径种植体成角排列时应力峰值略增高(最高为8.32 MPa);颊侧向舌侧斜向载荷下,粗直径种植体直线排列时应力峰值减低(最低为12.29 MPa),标准直径种植体颊侧成角排列时应力峰值减低(最低为15.48MPa),舌侧成角排列时应力峰值增高(最高为23.60 MPa)。结论下颌后牙区牙槽骨嵴颊舌径大时,采用直径≥4 mm 种植体的直线排列应力值明显减小,有利于应力分布。Objective To compare the stress distribution of the staggered and straight placement of implants in the mandibular posterior region. Methods Using three-dimensional finite element approach to analyze the stress distribution and variance regularity under the localized load. Results Under vertical load ,the stress peak value reduced when wide implant was placed straight （min ： 3.70 MPa） , but slightly increased when normal implant was placed staggered （ max ： 8.32 MPa ） ; under the inclined load from bueeal to lingual direction,the stress peak value reduced when the wide implant was placed in straight line （min： 12. 29 MPa） or normal implant was placed staggered with buccal offset configuration （min：15.48 MPa）,but increased with lingual offset configuration （max ： 23.60 MPa）. Conclusions Wide implant（ ≥4 mm） with straight placement should be adopted to reduce the stress peak value and improve stress distribution, when the buccolingual diameter of the alveolar ridge in the mandibular posterior region was wide.

关 键 词：牙种植 义齿 局部 固定 义齿设计 

分 类 号：R783[医药卫生—口腔医学]