CAJ | 학술논문

目的：应用三维有限元分析不同材料嵌体修复邻牙合(Ⅱ类)洞型后牙体组织的应力变化趋势。方法采用锥形束 CT(CBCT)扫描的方法,应用 Mimics、Geomagic 逆向工程等软件建立含嵌体修复的邻牙合面(Ⅱ类)洞型三维有限元模型,并求解分析各模型中垂直、侧向力(舌向45°)加载条件下牙体主应力峰值及不同嵌体修复邻牙合(Ⅱ类)洞后牙体的 Von-mises 应力分布状况。结果建立了包含牙釉质、本质、髓腔以及牙周膜、牙槽骨的精细下颌第一磨牙邻牙合面(Ⅱ类)近中-牙合(MO)洞型不同嵌体修复三维有限元模型。侧向加载(舌向45°)时牙体的应力峰值明显高于垂直加载,2种加载下4种材料应力值按照降序排列为：钴铬合金>金合金>瓷>树脂。4种不同材料对牙体组织的应力分布相似,牙体的应力峰值主要在洞底部牙本质所对应的髓腔处。结论在下颌第一磨牙邻牙合面(Ⅱ类)洞型的嵌体修复中,与其他3种材料相比,树脂嵌体因其与牙体组织更加相近的弹性模量而产生对牙体组织更小的应力,有利于减少牙折等危险。
목적：응용삼유유한원분석불동재료감체수복린아합(Ⅱ류)동형후아체조직적응력변화추세。방법채용추형속 CT(CBCT)소묘적방법,응용 Mimics、Geomagic 역향공정등연건건립함감체수복적린아합면(Ⅱ류)동형삼유유한원모형,병구해분석각모형중수직、측향력(설향45°)가재조건하아체주응력봉치급불동감체수복린아합(Ⅱ류)동후아체적 Von-mises 응력분포상황。결과건립료포함아유질、본질、수강이급아주막、아조골적정세하합제일마아린아합면(Ⅱ류)근중-아합(MO)동형불동감체수복삼유유한원모형。측향가재(설향45°)시아체적응력봉치명현고우수직가재,2충가재하4충재료응력치안조강서배렬위：고락합금>금합금>자>수지。4충불동재료대아체조직적응력분포상사,아체적응력봉치주요재동저부아본질소대응적수강처。결론재하합제일마아린아합면(Ⅱ류)동형적감체수복중,여기타3충재료상비,수지감체인기여아체조직경가상근적탄성모량이산생대아체조직경소적응력,유리우감소아절등위험。
ABSTRACT:Objective To analyze the stress changes of tooth tissues in the medial-occlusal (Class Ⅱ)cavity restored with different kinds of inlay materials by the three-dimensional (3-D)finite element.Methods The inlay restored 3-D finite element model of medial-occlusal (Class Ⅱ)cavity was established by CBCT scanning method and reverse engineering software Mimics,Geomagic Studio,Pro/E5.0 software,and finite element analysis software. The Von-mises stress and change tendency of tooth tissues and four different kinds of inlay materials were compared after taking vertical loading and tongue 45°to loading.Results There were different stress levels of tooth tissues among different inlays of medial-occlusal (MO)Class Ⅱ cavity.The stress level of the cobalt chromium alloy inlay was the largest,the stress level of the gold alloy inlay was lower,and the stress level of the composite inlay was the lowest.Dental tissues stress distribution was similar for the four different restorative materials,and focused on hole bottom of dentin near the pulp in dentin.Conclusion Compared with ceramics,gold alloy and cobalt chromium inlay restoration,restoration with composite resin inlay can reduce the organization stress of the remaining tooth in the medial-occlusal (Class Ⅱ)cavity type.