实用口腔医学杂志
實用口腔醫學雜誌
실용구강의학잡지
JOURNAL OF PRACTICAL STOMATOLOGY
2009年
6期
820-823
,共4页
赵静辉%周延民%赵云亮%李春艳
趙靜輝%週延民%趙雲亮%李春豔
조정휘%주연민%조운량%리춘염
牙种植体%螺距%应力分布%有限元分析
牙種植體%螺距%應力分佈%有限元分析
아충식체%라거%응력분포%유한원분석
Dental implants%Pitch%Stress distribution%Finite element analysis
目的:用三维有限元方法分析不同螺距种植体-骨界面应力分布状况,确定利于应力均匀分布的最佳螺纹参数设计.方法:建立包含上部结构的牙种植体、局部下颌骨块三维有限元模型,利用Cosmos/works软件分析在垂直、斜向45° 2 种集中载荷下螺距分别为0.6、 0.8、 1.0 mm的3 种种植体与骨界面的应力分布状况.结果:螺距为0.8 mm种植体周围Von-Mises应力、拉应力、压应力峰值较小,应力分布最均匀;同一螺距种植体斜向载荷下应力显著高于垂直载荷;应力集中主要出现于种植体颈部、皮质骨上缘和种植体末端最下一个螺纹处.结论:螺纹种植体螺距影响骨界面的应力分布和(牙合)力传导,为避免应力集中种植体末端螺纹应进行适当的截齿处理,种植义齿设计和修复时应尽可能减小或避免非轴向力.
目的:用三維有限元方法分析不同螺距種植體-骨界麵應力分佈狀況,確定利于應力均勻分佈的最佳螺紋參數設計.方法:建立包含上部結構的牙種植體、跼部下頜骨塊三維有限元模型,利用Cosmos/works軟件分析在垂直、斜嚮45° 2 種集中載荷下螺距分彆為0.6、 0.8、 1.0 mm的3 種種植體與骨界麵的應力分佈狀況.結果:螺距為0.8 mm種植體週圍Von-Mises應力、拉應力、壓應力峰值較小,應力分佈最均勻;同一螺距種植體斜嚮載荷下應力顯著高于垂直載荷;應力集中主要齣現于種植體頸部、皮質骨上緣和種植體末耑最下一箇螺紋處.結論:螺紋種植體螺距影響骨界麵的應力分佈和(牙閤)力傳導,為避免應力集中種植體末耑螺紋應進行適噹的截齒處理,種植義齒設計和脩複時應儘可能減小或避免非軸嚮力.
목적:용삼유유한원방법분석불동라거충식체-골계면응력분포상황,학정리우응력균균분포적최가라문삼수설계.방법:건립포함상부결구적아충식체、국부하합골괴삼유유한원모형,이용Cosmos/works연건분석재수직、사향45° 2 충집중재하하라거분별위0.6、 0.8、 1.0 mm적3 충충식체여골계면적응력분포상황.결과:라거위0.8 mm충식체주위Von-Mises응력、랍응력、압응력봉치교소,응력분포최균균;동일라거충식체사향재하하응력현저고우수직재하;응력집중주요출현우충식체경부、피질골상연화충식체말단최하일개라문처.결론:라문충식체라거영향골계면적응력분포화(아합)력전도,위피면응력집중충식체말단라문응진행괄당적절치처리,충식의치설계화수복시응진가능감소혹피면비축향력.
Objective; To investigate the stress distribution in implant-bone interface with different pitches by three-dimension finite element analysis method in order to decide the best design of thread parameters for stress distribution. Methods: Built three-dimension finite element models of partial mandible and dental implant with superstructure. The stress distributions in bone and three kinds of implants whose pitches were 0.6, 0.8 and 1.0 mm respectively, under axial and oblique 45 degree to axle concentrated load. Data were analyzed by Cosmos/works software. Results;The maximal Von-Mises stress, tensile stress and compressive stress of implant with 0.8 mm pitch were lower than others, the stress distribution was even. The stresses in the same model under oblique load were much higher than those under axial load. The stress concentrated more on implant neck, upper part of cortical bone and the lowest thread on implant. Conclusion; The pitch of implant has effect on stress distribution in implant-bone interface and the transmission of occlusal force. The lower threads on implant should be cut to avoid the concentration of stress, and the non-axial force should be reduced as possible as we can or avoided when we design and make implant denture.