下颌磨牙半切术后不同固定修复设计的光弹性应力分析  

Photoelastic stress analysis of four kinds of prosthodontia design for mandibular molar with hemisection

作　　者：张冬梅[1] 毛勇[2] 张铁[2] 张少锋[2] 

机构地区：[1]北京军区联勤部第二干休所门诊部,北京100071 [2]第四军医大学口腔医学院修复科,陕西西安710032

出　　处：《牙体牙髓牙周病学杂志》2010年第9期510-513,共4页Chinese Journal of Conservative Dentistry

摘　　要：目的:研究下颌第一磨牙半切术后不同固定修复设计对余留牙根牙槽骨应力分布的影响。方法:采用光弹应力冻结切片法,以正常未半切的46为对照,分析正常咀嚼力作用下,46近中根半切术后,45、46、47联冠、45、46联冠、46、47联冠以及46单冠4种修复设计对半切术后余留远中牙根周围支持组织应力状况的影响。结果:46远中根在45、46、47联冠及45、46联冠修复时两者的牙周支持组织应力峰值相近,并略大于正常46对照组,无统计学差异(P>0.05);46、47联冠修复时应力峰值是对照组的2倍左右,且有显著性差异(P<0.05);46单冠修复时应力峰值远大于正常对照组的2倍,并与各组均有显著性差异(P<0.05)。结论:下颌第一磨牙近中根半切术后宜选用第二前磨牙、第一磨牙联冠或第二前磨牙、第一、二磨牙联冠修复较为合理。AIM ： To investigate the stress distribution of alveolar bone caused by four kinds of fixed prosthesis design for first mandibular molar after hemisection. METHODS ： The photoelastic model of normal mandibular first molar in D area was selected as the control group. Photoelastic stress freeze sectioning analysis was employed to investigate the stress distribution around the reserved distal root of the first mandibular molar with four kinds of fixed prosthesis designs. After the hemisection, the restorations of combined crowns of the second mandibular premolar, the first and second mandibular molars, combined crowns of the second mandibular premolar and first mandibular molar com- bined crowns of the first and second mandibular molars and single crown of the first mandibular molar were designed. RESULTS ： The stress peak value of the combined crowns of the second mandibular premolar and first mandibular molar was nearly equal to that of the combined crowns of the second mandibular premolar, the first and second mandibular molars and it was slightly larger than that of the control group. The stress peak value of the combined crowns of the first and second mandibular molars was twice of the control group, while in the models of the single crown, the value was o- ver 3 times of the control group. CONCLUSIONS ： The restoration of the combined crown of the second mandibular premolar and first mandibular molar, is well as the combined crown of the second mandibular premolar, the first and second mandibular molars are more applicable for the reserved root following the hemisection therapy.

关 键 词：半切术 光弹性试验 应力分析 

分 类 号：R783.1[医药卫生—口腔医学]