Adhesive class I restorations in sound molar teeth incorporating combined resin-composite and glass ionomer materials: CAD-FE modeling and analysis
Adhesive class I restorations in sound molar teeth incorporating combined resin-composite and glass ionomer materials: CAD-FE modeling and analysis
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DOI：
10.1016/j.dental.2019.07.017
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发表时间：
2019-10-01
期刊：
影响因子：
5
通讯作者：
Watts, David C.
中科院分区：
文献类型：
--
作者：
Ausiello, Pietro;Ciaramella, Stefano;Watts, David C.
目标.采用数值有限元分析（FEA）研究不同树脂复合材料和玻璃离子粘固剂材料组合在“双层”与“单层”粘接技术中对磨牙I类洞修复的影响。材料与方法。从一个完整的磨牙CAD模型中创建了三个具有4 mm深I类洞的虚拟修复下磨牙模型。考虑了粘合剂和可流动复合材料与散装填充复合材料的组合（模型A）、玻璃离子粘固剂与散装填充复合材料的组合（模型B）以及粘合剂与散装填充复合材料的组合（模型C）。从CAD模型开始，创建并分析3D有限元（FE）模型。在咬合面上模拟固体食物，在牙齿表面和食物之间使用滑动式接触单元。对复合材料的聚合收缩进行了模拟。生理咀嚼负荷施加到这些系统结合收缩。进行了静态线性分析。采用最大正应力准则作为潜在损伤的度量。所有模型均表现出高应力，主要位于沿着牙组织修复界面。所有模型显示出相似的应力趋势沿着釉质修复界面，其中应力高达22 MPa和19 MPa，分别记录在釉质和修复体。A和C模型在牙本质修复界面上显示出沿着相似的应力趋势，模型A中的应力水平较低，牙本质和修复体中分别记录到高达11.5 MPa和7.5 MPa的应力，而模型C中检测到的应力为17 MPa和9 MPa。与A、C两种模型相比，模型B的牙本质、修复体下层应力水平降低，洞底无应力，差异有统计学意义。有限元分析支持的积极影响，“双层”修复技术在4毫米深的I类洞在下磨牙与“单层”散装填充复合技术。(C)2019年牙科材料学院。爱思唯尔公司出版All rights reserved.
Objectives. To investigate the influence of different resin composite and glass ionomer cement material combinations in a "bi-layer" versus a "single-layer" adhesive technique for class I cavity restorations in molars using numerical finite element analysis (FEA).Materials and Methods. Three virtual restored lower molar models with class I cavities 4 mm deep were created from a sound molar CAD model. A combination of an adhesive and flowable composite with bulk fill composite (model A), of a glass ionomer cement with bulk fill composite (model B) and of an adhesive with bulk fill composite (model C), were considered. Starting from CAD models, 3D-finite element (FE) models were created and analyzed. Solid food was modeled on the occlusal surface and slide-type contact elements were used between tooth surface and food. Polymerization shrinkage was simulated for the composite materials. Physiological masticatory loads were applied to these systems combined with shrinkage. Static linear analyses were carried out. The maximum normal stress criterion was adopted as a measure of potential damage.Results. All models exhibited high stresses principally located along the tooth tissues-restoration interfaces. All models showed a similar stress trend along enamel restoration interface, where stresses up to 22 MPa and 19 MPa was recorded in the enamel and restoration, respectively. A and C models showed a similar stress trend along the dentin restoration interface with a lower stress level in model A, where stresses up to 11.5 MPa and 7.5 MPa were recorded in the dentin and restoration, respectively, whereas stresses of 17 MPa and 9 MPa were detected for model C. In contrast to A and C models, the model B showed a reduced stress level in dentin, in the lower restoration layer and no stress on the cavity floor.Significance. FE analysis supported the positive effect of a "bi-layer" restorative technique in a 4 mm deep class I cavities in lower molars versus "single-layer" bulk fill composite technique. (C) 2019 The Academy of Dental Materials. Published by Elsevier Inc. All rights reserved.