Ⅱ类骨质下上颌窦区垂直骨高度不足时应用短种植体长度和直径的优化分析  

Bivariate evaluation of the short implant diameter and length in type Ⅱ jaw bone of maxillary sinus area

作　　者：王晗[1] 李德超[1] 朱扬[1] 张琳琳[2] 李鹤佳[3] 

机构地区：[1]佳木斯大学附属口腔医院口腔种植科,黑龙江省佳木斯市154002 [2]双鸭山市口腔医院牙周黏膜科,黑龙江省双鸭山市155100 [3]佳木斯大学附属口腔医院口腔修复科,黑龙江省佳木斯市154002

出　　处：《中国组织工程研究与临床康复》2011年第22期4069-4072,共4页Journal of Clinical Rehabilitative Tissue Engineering Research

基　　金：课题受黑龙江省卫生厅科技项目(2009-366);佳木斯大学科学技术研究项目(Sz2009-001)资助~~

摘　　要：背景：应用短种植体在上颌窦区种植后生物力学指标会有哪些变化？目的：建立包含上颌窦的Ⅱ类骨质真实上颌骨模型,观察Ⅱ类骨质下上颌窦区垂直骨高度为9mm时应用短种植体的最佳的长度和直径范围。方法：建立包含短种植体的上颌窦区Ⅱ类骨质的骨块三维有限元模型,设定短种植体直径为4~6mm和长度为6~8mm,分析直径和长度对颌骨的等效应力峰值。结果与结论：垂直（颊舌）加载时,随着直径增加,皮、松质骨的等效应力分别下降26%（40%）和31%（45%）,随着长度增加,皮质骨和松质骨的等效应力峰值分别下降8%（5%）和0（7%）。两种方式加载时下,当直径〉4.8mm且长度〉7.5mm时,颌骨的等效应力峰值对直径和长度的响应曲线曲率位于-1和0之间,变量直径比长度对颌骨的等效应力峰值的影响更明显。结果证实,短种植体的长度和直径的增加可以降低颌骨应力,尤其是直径的增加更有利于改善力学分布,当窦嵴距为9mm应用短种植体时,直径应〉4.8mm,长度应〉7.5mm,可保证其稳定性。BACKGROUND：What changes occur in the biomechanical indexes of maxillary sinus area following short implant implantation？OBJECTIVE：To research the best range of length and diameter when applying the short implants at the vertical bone height in maxillary sinus of 9 mm,providing the theoretical basis for the clinical application of short implant.METHODS：The establishment of parameterization included the three-dimension finite element model of type Ⅱ bone of the upper jaw sinus area of short implant.The diameter of the short implants was 4-6 mm and the length was 6-8 mm.The maximum equivalent stresses of diameter and length for the jaw were analyzed.RESULTS AND CONCLUSION：Under vertical（buccal-lingual） loading condition,the amplification of maximum equivalent stresses in cortical bone and cancellous bone were 26%（40%） and 31%（45%） respectively with the diameter increasing;The amplification of maximum equivalent stresses in cortical bone and cancellous bone were 8%（5%） and 0（7%） respectively with the length increasing.When diameter exceeded 4.8 mm and length exceeded 7.5 mm,the response curve curvatures of maximum equivalent stresses to diameter and length in jaw bone ranged from-1 to 0.And the variation of the maximum equivalent stresses in jaw bone was more sensitive to diameter than to length.The increasing for the diameter and length of short implants could reduce the stress of jaw bone.Especially the increasing of diameter are could improve distribution of mechanics better.From the biomechanics angle,when vertical bone height in maxillary sinus of 9 mm short implant,the diameter should be 4.8 mm,the length should be 7.5 mm,to ensure its stability.

关 键 词：短种植体 应力分布 上颌窦区骨高度不足 Ⅱ类骨质 组织构建 

分 类 号：R318[医药卫生—生物医学工程]