中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2013年
7期
409-413
,共5页
韦健%徐镔亭%李清%王贻宁
韋健%徐鑌亭%李清%王貽寧
위건%서빈정%리청%왕이저
有限元分析%义齿,局部%牙周组织
有限元分析%義齒,跼部%牙週組織
유한원분석%의치,국부%아주조직
Finite element analysis%Denture,partial%Periodontium
目的 探讨三维红外扫描用于可摘局部义齿三维有限元建模的可行性,并分析基牙牙周损伤对可摘局部义齿应力分布的影响,以期为临床提供参考.方法 利用齿科非接触式红外扫描仪和Simpleware软件对下颌肯尼迪分类法Ⅱ类缺损的可摘局部义齿进行三维建模,构建正常牙槽骨组、牙槽骨吸收组和牙槽骨吸收伴牙周膜增宽组三维有限元模型.使用Abaqus有限元分析软件,研究垂直加载和颊侧45°加载条件下3组牙槽骨的应力分布.结果 垂直加载和颊侧45°加载条件下,3组模型均在义齿近中基牙和剩余牙槽嵴远中出现应力集中；牙槽骨吸收伴牙周膜增宽组近中基牙的应力最大(分别为3.57和2.50 MPa),其次为牙槽骨吸收组(分别为3.21和2.41 MPa),正常牙槽骨组最小(分别为2.63和1.79 MPa).颊侧45°加载时3组模型剩余牙槽嵴远中颊侧和远中位点上的应力值均大于垂直加载.结论 基于三维红外扫描的有限元建模方法是可摘局部义齿有限元应力分析有效的建模方式.
目的 探討三維紅外掃描用于可摘跼部義齒三維有限元建模的可行性,併分析基牙牙週損傷對可摘跼部義齒應力分佈的影響,以期為臨床提供參攷.方法 利用齒科非接觸式紅外掃描儀和Simpleware軟件對下頜肯尼迪分類法Ⅱ類缺損的可摘跼部義齒進行三維建模,構建正常牙槽骨組、牙槽骨吸收組和牙槽骨吸收伴牙週膜增寬組三維有限元模型.使用Abaqus有限元分析軟件,研究垂直加載和頰側45°加載條件下3組牙槽骨的應力分佈.結果 垂直加載和頰側45°加載條件下,3組模型均在義齒近中基牙和剩餘牙槽嵴遠中齣現應力集中；牙槽骨吸收伴牙週膜增寬組近中基牙的應力最大(分彆為3.57和2.50 MPa),其次為牙槽骨吸收組(分彆為3.21和2.41 MPa),正常牙槽骨組最小(分彆為2.63和1.79 MPa).頰側45°加載時3組模型剩餘牙槽嵴遠中頰側和遠中位點上的應力值均大于垂直加載.結論 基于三維紅外掃描的有限元建模方法是可摘跼部義齒有限元應力分析有效的建模方式.
목적 탐토삼유홍외소묘용우가적국부의치삼유유한원건모적가행성,병분석기아아주손상대가적국부의치응력분포적영향,이기위림상제공삼고.방법 이용치과비접촉식홍외소묘의화Simpleware연건대하합긍니적분류법Ⅱ류결손적가적국부의치진행삼유건모,구건정상아조골조、아조골흡수조화아조골흡수반아주막증관조삼유유한원모형.사용Abaqus유한원분석연건,연구수직가재화협측45°가재조건하3조아조골적응력분포.결과 수직가재화협측45°가재조건하,3조모형균재의치근중기아화잉여아조척원중출현응력집중；아조골흡수반아주막증관조근중기아적응력최대(분별위3.57화2.50 MPa),기차위아조골흡수조(분별위3.21화2.41 MPa),정상아조골조최소(분별위2.63화1.79 MPa).협측45°가재시3조모형잉여아조척원중협측화원중위점상적응력치균대우수직가재.결론 기우삼유홍외소묘적유한원건모방법시가적국부의치유한원응력분석유효적건모방식.
Objective To evaluate three-dimensional (3D) finite element (FE) modeling of different periodontally compromised unilateral distal extension removable partial denture (RPD) abutments using the data of a 3D non-contact digitizing scanner.Methods FE models were established,and the following structures were simulated in the models:alveolar bone,mucosa,abutments,periodontal ligaments,framework and artificial teeth.The alveolar bone and periodontal ligaments around the distal abutment in the three models were designed as normal,with bone defect and with periodontal ligaments defect respectively.Vertical or buccally inclined forces of 50,100,100 N were applied on the artificial teeth of the RPD and the stress distributions on the supporting tissues were calculated.Results Under vertical loading,the maximal stress on the alveolar bone of the abutment were as follows:periodontal ligaments defect model (3.57 MPa) ＞ bone defect model (3.21 MPa) ＞ normal model (2.63 MPa).Under buccally inclined loading,the maximal stress on the alveolar bone of the abutment were as follows:periodontal ligaments defect model (2.50 MPa) ＞ bone defect model (2.41 MPa) ＞ normal model (1.79 MPa).Under buccally inclined loading,the stresses on distal aspects of the residual alveolar ridge were higher than that of the vertical loading model Conclusions 3D non-contact digitalizing scanner was useful for the finite element modeling process of removable partial denture.
