CAJ | 학술논문

目的：探讨不同种类粘接剂对双层结构的全瓷冠及粘接剂应力分布的影响，为临床修复设计提供依据。方法利用螺旋CT断层图像，构建双层结构的全瓷冠（核瓷层和饰瓷层）、粘接剂层、牙体组织、牙根、牙周膜和牙槽骨6部分的三维有限元模型，设计垂直集中载荷600N的加载方式，分析全瓷冠经3种不同粘接剂（Panavia，3M RelyX Unicem，3M RelyX Luting）粘固后，粘接剂层、核瓷层和饰瓷层的最大主应力分布。结果粘接层应力集中部位为近中颊侧肩台和腭侧面近牙合面部分。核瓷层应力主要集中在核瓷内部，饰瓷层应力主要集中在加载点附近。随着粘接材料弹性模量的增加，位于饰瓷层的最大主应力呈现出下降的趋势，而位于核瓷层和粘接层的最大主应力出现上升的趋势。结论全瓷冠在不同粘接材料粘固后受到力的作用时，最大主应力分布区域相对固定，但分布范围有向加载侧分布的趋势。在某些条件下，高弹性模量的粘接剂可能会降低全瓷冠崩瓷的发生，并在一定程度上降低核瓷层的抗折能力。
목적：탐토불동충류점접제대쌍층결구적전자관급점접제응력분포적영향，위림상수복설계제공의거。방법이용라선CT단층도상，구건쌍층결구적전자관（핵자층화식자층）、점접제층、아체조직、아근、아주막화아조골6부분적삼유유한원모형，설계수직집중재하600N적가재방식，분석전자관경3충불동점접제（Panavia，3M RelyX Unicem，3M RelyX Luting）점고후，점접제층、핵자층화식자층적최대주응력분포。결과점접층응력집중부위위근중협측견태화악측면근아합면부분。핵자층응력주요집중재핵자내부，식자층응력주요집중재가재점부근。수착점접재료탄성모량적증가，위우식자층적최대주응력정현출하강적추세，이위우핵자층화점접층적최대주응력출현상승적추세。결론전자관재불동점접재료점고후수도력적작용시，최대주응력분포구역상대고정，단분포범위유향가재측분포적추세。재모사조건하，고탄성모량적점접제가능회강저전자관붕자적발생，병재일정정도상강저핵자층적항절능력。
Objective To investigate the relationship between the bonding agents and the stress distribu-tion of all-ceramic crown and then provide the basis for clinical restoration design. Methods The tomography im-ages of spiral CT were used to construct the finite element analysis mode, which was composed of six parts:double layer structure of all-ceramic crown(include the core layer and the veneer layer), adhesive layer, tooth tissues, tooth root, periodontal ligament, and alveolar bone. The loading way was designed as follows:600N load was verti-cally concentrated, and ANSYS software was used to analyze the stress values of the core layer、the veneer layer and the adhesive layer with three bonding agents including the Panavia,the 3M RelyX Unicem and the3M RelyX Luting cement. Results The distribution area of stress in the adhesive layer was near the mesio-buccal shoulder and occlusal surface at the lingual side;the stress of the core layer was concentrated within the core porcelain and the stress of the veneer layer was located in where the load applied. With the increase of the elasticity modulus of the bonding agents, the maximum principal stress declined in the veneer layer, and the maximum principal stress increased in the core layer and the adhesive layer. Conclusions Under loading when all-ceramic crown was ce-mented with different bonding agents, the distribution areas of the maximum principal stress are always stable, but there is a trend due to the load:the distribution areas are more likely to move to the place near the load position. The bonding agents with high elasticity modulus may reduce the risk of collapse porcelain of all-ceramic crowns, but it also may cause the decrease of the fracture resistance of core porcelain to a certain extent.