中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2014年
6期
357-361
,共5页
张一祎%阿依古丽·阿不都斯木%李清%王贻宁
張一祎%阿依古麗·阿不都斯木%李清%王貽寧
장일의%아의고려·아불도사목%리청%왕이저
桩核技术%有限元分析%牙修复失效%肩领
樁覈技術%有限元分析%牙脩複失效%肩領
장핵기술%유한원분석%아수복실효%견령
Post and core technique%Finite element analysis%Dental restoration failure%Ferrule
目的 利用基于断裂力学理论的扩展有限元法,探讨牙本质肩领高度对纤维桩核冠修复体应力分布及断裂失败过程的影响,以期为临床提供参考.方法 使用齿科非接触式红外扫描仪获得扫描数据,利用Simpleware软件构建上颌中切牙桩核冠修复体三维模型,分别设计牙本质肩领高度为0、1、2、3 mm的模型.使用Abaqus有限元分析软件,线性分析腭侧45°加载350 N静态载荷时修复体各结构的应力分布.利用基于断裂力学理论的扩展有限元最大主应力准则,非线性分析粘接界面破坏的发生和发展.结果 线性分析显示4种模型应力分布相近,但0和1 mm模型玻璃离子粘接剂层腭侧有明显的应力集中.非线性分析显示0 mm模型在静态载荷加载50.4和94.7 N时玻璃离子和树脂粘接剂层发生破坏.3 mm模型在静态载荷加载65.9和228.2 N时玻璃离子和树脂粘接剂层发生破坏.结论 扩展有限元可准确模拟纤维增强树脂桩核冠修复体的破坏失败过程;牙本质肩领通过减小和分散粘接界面的应力,有效保护粘接界面;增加牙本质肩领高度对提高纤维桩核冠修复体的稳定有积极意义.
目的 利用基于斷裂力學理論的擴展有限元法,探討牙本質肩領高度對纖維樁覈冠脩複體應力分佈及斷裂失敗過程的影響,以期為臨床提供參攷.方法 使用齒科非接觸式紅外掃描儀穫得掃描數據,利用Simpleware軟件構建上頜中切牙樁覈冠脩複體三維模型,分彆設計牙本質肩領高度為0、1、2、3 mm的模型.使用Abaqus有限元分析軟件,線性分析腭側45°加載350 N靜態載荷時脩複體各結構的應力分佈.利用基于斷裂力學理論的擴展有限元最大主應力準則,非線性分析粘接界麵破壞的髮生和髮展.結果 線性分析顯示4種模型應力分佈相近,但0和1 mm模型玻璃離子粘接劑層腭側有明顯的應力集中.非線性分析顯示0 mm模型在靜態載荷加載50.4和94.7 N時玻璃離子和樹脂粘接劑層髮生破壞.3 mm模型在靜態載荷加載65.9和228.2 N時玻璃離子和樹脂粘接劑層髮生破壞.結論 擴展有限元可準確模擬纖維增彊樹脂樁覈冠脩複體的破壞失敗過程;牙本質肩領通過減小和分散粘接界麵的應力,有效保護粘接界麵;增加牙本質肩領高度對提高纖維樁覈冠脩複體的穩定有積極意義.
목적 이용기우단렬역학이론적확전유한원법,탐토아본질견령고도대섬유장핵관수복체응력분포급단렬실패과정적영향,이기위림상제공삼고.방법 사용치과비접촉식홍외소묘의획득소묘수거,이용Simpleware연건구건상합중절아장핵관수복체삼유모형,분별설계아본질견령고도위0、1、2、3 mm적모형.사용Abaqus유한원분석연건,선성분석악측45°가재350 N정태재하시수복체각결구적응력분포.이용기우단렬역학이론적확전유한원최대주응력준칙,비선성분석점접계면파배적발생화발전.결과 선성분석현시4충모형응력분포상근,단0화1 mm모형파리리자점접제층악측유명현적응력집중.비선성분석현시0 mm모형재정태재하가재50.4화94.7 N시파리리자화수지점접제층발생파배.3 mm모형재정태재하가재65.9화228.2 N시파리리자화수지점접제층발생파배.결론 확전유한원가준학모의섬유증강수지장핵관수복체적파배실패과정;아본질견령통과감소화분산점접계면적응력,유효보호점접계면;증가아본질견령고도대제고섬유장핵관수복체적은정유적겁의의.
Objective To investigate the stress distributions and cracks initiation and propagation within the cementation of post and core restored teeth with various ferrule heights.Methods Threedimentional finite element(FE) models of post and core restored teeth with different ferrule heights(0,1,2,3 mm) were created by using the data of a three-dimentional non-contact digital scanning.Vertical oblique forces of 350 N (45 ° to the long axis of the root) were applied on the lingual surface of the teeth (4 mm below the incisal edge).Both linear analysis and extended finite element methods (XFEM) were used to investigate stress distributions,especially those in the adhesive interfaces.Results Linear analysis results showed that the stress distributions within the root were quite similar among the groups.However,obvious stress concentrations were detected on palatal glass ionomer cement layer in the groups with 0 mm and 1 mm ferrule.According to the XFEM results,cracks were firstly initiated within the glass ionomer cement layer,and then propagated towards the adhesive resin cement layer.The ultimate loads that induced the damage within glass ionomer cement layer and adhesive resin cement layer in 0 mm ferrule group (50.4 and 94.7 N)were less than those in 3 mm ferrule group(65.9 and 228.2 N).Conclusions Adhesive interface was the susceptible structure of post and core restored teeth.Increasing ferrule height can significantly reduced the stress concentration within the palatal adhesive interface.
