中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2012年
7期
435-438
,共4页
牙种植体%有限元分析%义齿,局部,固定%动力分析
牙種植體%有限元分析%義齒,跼部,固定%動力分析
아충식체%유한원분석%의치,국부,고정%동력분석
Dental implants%Finite element analysis%Denture,partial,fixed%Dynamic analysis
目的 探讨动态加载时种植桥的骨界面应力分布规律,为临床提供参考.方法 在双端种植桥修复前后的有限元模型上,模拟一个咀嚼周期0.875 s内连续性的垂直向、舌向及颊向运动,分别对两颗种植基牙和种植桥进行单独加载和共同加载.计算种植体-骨界面的应力并比较,绘制应力图.结果 修复前加载(5-｜) 牙冠,斜向加载完成时(5-｜)骨界面的应力最大值是垂直加载完成时的4.2倍.修复后同时加载两颗种植基牙的修复冠及桥体,斜向加载完成时(5 -｜)骨界面的应力最大值是垂直加载完成时的1.2倍.修复前加载在(5-｜)牙冠上,0.300 s时应力最大值为48.393 MPa;单独加载种植桥的(5-｜)修复冠,0.300 s时模型总体最大值为9.541 MPa,在(7-｜)骨界面的远中颈缘.单独加载桥体和同时加载种植基牙的修复冠及桥体时(7-｜)骨界面应力最大值在各时段末均大于(5-｜)骨界面.结论 双端种植桥减少斜向载荷的不利影响,均匀合理地分布骨界面的应力.
目的 探討動態加載時種植橋的骨界麵應力分佈規律,為臨床提供參攷.方法 在雙耑種植橋脩複前後的有限元模型上,模擬一箇咀嚼週期0.875 s內連續性的垂直嚮、舌嚮及頰嚮運動,分彆對兩顆種植基牙和種植橋進行單獨加載和共同加載.計算種植體-骨界麵的應力併比較,繪製應力圖.結果 脩複前加載(5-｜) 牙冠,斜嚮加載完成時(5-｜)骨界麵的應力最大值是垂直加載完成時的4.2倍.脩複後同時加載兩顆種植基牙的脩複冠及橋體,斜嚮加載完成時(5 -｜)骨界麵的應力最大值是垂直加載完成時的1.2倍.脩複前加載在(5-｜)牙冠上,0.300 s時應力最大值為48.393 MPa;單獨加載種植橋的(5-｜)脩複冠,0.300 s時模型總體最大值為9.541 MPa,在(7-｜)骨界麵的遠中頸緣.單獨加載橋體和同時加載種植基牙的脩複冠及橋體時(7-｜)骨界麵應力最大值在各時段末均大于(5-｜)骨界麵.結論 雙耑種植橋減少斜嚮載荷的不利影響,均勻閤理地分佈骨界麵的應力.
목적 탐토동태가재시충식교적골계면응력분포규률,위림상제공삼고.방법 재쌍단충식교수복전후적유한원모형상,모의일개저작주기0.875 s내련속성적수직향、설향급협향운동,분별대량과충식기아화충식교진행단독가재화공동가재.계산충식체-골계면적응력병비교,회제응력도.결과 수복전가재(5-｜) 아관,사향가재완성시(5-｜)골계면적응력최대치시수직가재완성시적4.2배.수복후동시가재량과충식기아적수복관급교체,사향가재완성시(5 -｜)골계면적응력최대치시수직가재완성시적1.2배.수복전가재재(5-｜)아관상,0.300 s시응력최대치위48.393 MPa;단독가재충식교적(5-｜)수복관,0.300 s시모형총체최대치위9.541 MPa,재(7-｜)골계면적원중경연.단독가재교체화동시가재충식기아적수복관급교체시(7-｜)골계면응력최대치재각시단말균대우(5-｜)골계면.결론 쌍단충식교감소사향재하적불리영향,균균합리지분포골계면적응력.
Objective To study the distribution patterns of stresses induced in bone tissue surrounding solely and splinted implants under dynamic loads.Methods Three dimensional finite-element models were created of two (765-｜） sections of the mandible with solely or splinted implants embedded in.Vertical and oblique dynamic loads were applied in a circle of mastication(0.875 s).The stress distribution was analyzed to study the biomechanical behavior of bone tissue surrounding solely or splinted implants.Results As loading on the solely implant （5-｜）,the maximum von Mises value in the surrounding bone tissue under oblique loads at 0.300 s was 4.2 times as much as that under vertical loads at 0.150 s.Meanwhile,as coincidently loading on the splinted implants,the maximum von Mises value at 0.300 s was 1.2 times as much as that at 0.150 s.As loading on the solely implant （5-｜）,the maximum stress value was 48.393 MPa at 0.300 s.As separately loading on the splinted implant （5-｜）,the maximum stress value of the whole model was 9.541 MPa in the same loading course,and the maximum stress was located at the distal cervical of the indirectly loaded implant （7-｜）. When loading on the pontic,the stress in bone tissue surrounding implant (7-｜） was more than that of implant （5-｜）.Conclusions Stress in the bone-interface of the splinted implants is evenly distributed at the cervical level,which may also reduce disadvantages from oblique loads.
