中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2013年
z1期
10-14
,共5页
李军心%聂杰%王晓燕%高学军
李軍心%聶傑%王曉燕%高學軍
리군심%섭걸%왕효연%고학군
根管疗法%有限元分析%牙应力分析%直接粘接修复
根管療法%有限元分析%牙應力分析%直接粘接脩複
근관요법%유한원분석%아응력분석%직접점접수복
Root canal therapy%Finite element analysis%Dental stress analysis%Direct adhesive restoration
目的 通过有限元法分析根管治疗后牙齿直接粘接修复的应力分布,为临床选择修复方法提供理论依据.方法 利用微型CT扫描信息,建立因正畸治疗拔除的年轻男性上颌第二前磨牙三维有限元模型,模拟根管治疗后远中验面缺损的4种不同直接粘接修复方法(G3:单纯粘接修复；G4:腭尖覆盖修复；G5:全验面覆盖修复；G6:远中验面覆盖),以完整牙(G1)和缺损未修复牙(G2)作为对照.在两牙尖斜面上加载200 N的轴向载荷,分析各组修复后牙齿的应力分布情况及安全因子的大小.结果 G1 ～ G6组总体拉应力峰值依次为106、383、287、56、62和95 MPa；G3 ～ G6组修复体安全因子依次为5.46、1.38、1.43及1.73,粘接层安全因子依次为0.33、0.52、5.16及2.11.结论 综合牙齿应力分布和安全因子因素,全(牙合)面或保留一侧完整边缘嵴的(牙合)面覆盖修复方式优于单纯粘接修复和腭尖覆盖的修复方式.
目的 通過有限元法分析根管治療後牙齒直接粘接脩複的應力分佈,為臨床選擇脩複方法提供理論依據.方法 利用微型CT掃描信息,建立因正畸治療拔除的年輕男性上頜第二前磨牙三維有限元模型,模擬根管治療後遠中驗麵缺損的4種不同直接粘接脩複方法(G3:單純粘接脩複；G4:腭尖覆蓋脩複；G5:全驗麵覆蓋脩複；G6:遠中驗麵覆蓋),以完整牙(G1)和缺損未脩複牙(G2)作為對照.在兩牙尖斜麵上加載200 N的軸嚮載荷,分析各組脩複後牙齒的應力分佈情況及安全因子的大小.結果 G1 ～ G6組總體拉應力峰值依次為106、383、287、56、62和95 MPa；G3 ～ G6組脩複體安全因子依次為5.46、1.38、1.43及1.73,粘接層安全因子依次為0.33、0.52、5.16及2.11.結論 綜閤牙齒應力分佈和安全因子因素,全(牙閤)麵或保留一側完整邊緣嵴的(牙閤)麵覆蓋脩複方式優于單純粘接脩複和腭尖覆蓋的脩複方式.
목적 통과유한원법분석근관치료후아치직접점접수복적응력분포,위림상선택수복방법제공이론의거.방법 이용미형CT소묘신식,건립인정기치료발제적년경남성상합제이전마아삼유유한원모형,모의근관치료후원중험면결손적4충불동직접점접수복방법(G3:단순점접수복；G4:악첨복개수복；G5:전험면복개수복；G6:원중험면복개),이완정아(G1)화결손미수복아(G2)작위대조.재량아첨사면상가재200 N적축향재하,분석각조수복후아치적응력분포정황급안전인자적대소.결과 G1 ～ G6조총체랍응력봉치의차위106、383、287、56、62화95 MPa；G3 ～ G6조수복체안전인자의차위5.46、1.38、1.43급1.73,점접층안전인자의차위0.33、0.52、5.16급2.11.결론 종합아치응력분포화안전인자인소,전(아합)면혹보류일측완정변연척적(아합)면복개수복방식우우단순점접수복화악첨복개적수복방식.
Objective To analyze the stress distribution of different cusp coverage composite restorations in endodontically treated teeth using a three-dimensional finite element analysis(FEA).Methods An intact maxillary second premolar of young male extracted for orthodontic treatment was digitized with a micro-CT scanner to establish a three-dimensional finite element model.The model was further modified to simulate different cavity preparations.Six individual finite element models were built up:G1,intact premolar; G2,endodontically treated premolar with distal occlusal (DO) defect; G3-G6,endodontically treated premolars with DO defect restored with different cusp coverage composite restorations (G3:directly restoration ; G4:partial coverage of palatal cusp; G5:full coverage of occlusal surface; G6:partial coverage of occlusal surface).The load of 200 N was applied to two cusp incline surfaces.The stress distribution and safety factor of each group was investigated.Results For G1 to G6,the tensile stress of the whole tooth were 106,383,287,56,62 and 95 MPa,respectively.For G3 to G6,the safety factors of the restoration were 5.46,1.38,1.43,1.73,while the safety factors of the adhesive layer were 0.33,0.52,5.16,2.11,respectively.Conclusions The full and partial coverage of occlusal surface was superior to that of palatal cusp coverage.
