Influence of restorative material and cement on the stress distribution of endocrowns: 3D finite element analysis

作者：Jiahui He, Ziting Zheng, Min Wu, Chunqing Zheng, Yuting Zeng, Wenjuan Yan · 发表于：BMC Oral Health · 年份：2021 · DOI：10.1186/s12903-021-01865-w · 被引用次数：39 · 研究领域：Dental materials and restorations、Endodontics and Root Canal Treatments、Orthodontics and Dentofacial Orthopedics

PURPOSE: This study aimed to evaluate the influence of different types of restorative materials and resin cements on the stress distribution in the regions of the restoration, cement layer and dental remnant in endodontically treated posterior endocrowns. METHODS: A 3D finite element analysis (FEA) model of the first mandibular molar that was restored with an endocrown designed by computer-aided design (CAD) software was generated. Three kinds of restorative materials (Vita Enamic (VE), IPS e.max CAD (EMX) and Grandio blocs (GR)) and two types of cementing materials (NX3 and Maxcem Elite Chroma (MX)) were analysed with such a model. The food layer was also designed before vertical (600 N) forces were applied to simulate physiological masticatory conditions. Thermal expansion was used to simulate the polymerization shrinkage effects of cement layers. The results were obtained by colorimetric graphs of the maximum principal stress in the restoration and tooth remnant. The failure risk of the cement layer was also calculated based on the normal stress. RESULTS: The elastic modulus was positively correlated with the tensile stress peak values in the restoration, mainly at the intaglio surface. However, in the cervical enamel and cement layer, restorative material with a higher elastic modulus generated lower peak stress values. The cement with a higher elastic modulus resulted in higher stress peak values inside the cement layer. The combination of EMX (restorative material) and ...