Increased Stress Concentration in Prosthesis, Adhesive Cement, and Periodontal Tissue with Zirconia RBFDPs by the Reduced Alveolar Bone Height
Increased Stress Concentration in Prosthesis, Adhesive Cement, and Periodontal Tissue with Zirconia RBFDPs by the Reduced Alveolar Bone Height
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DOI：
10.1111/jopr.13293
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发表时间：
2020-12-08
影响因子：
4
通讯作者：
Miura，Hiroyuki
中科院分区：
文献类型：
--
作者：
Sukumoda，Erika;Nemoto，Reina;Miura，Hiroyuki
目的探讨牙槽骨水平降低患者树脂粘结固定义齿支架脱粘的风险及其对牙周组织的影响。将使用氧化锆制造的树脂粘结固定牙科修复体框架设置为具有五个不同牙槽骨水平的模型。在桥体中心施加200-N的载荷（前牙最大咬合力），利用有限元分析方法分析支架、粘固剂和牙周组织的内应力。ResultsThe平均最大主应力在正常和最低牙槽骨水平的模型中分别为25.33和29.35 MPa。关于粘结剂上的剪切应力，在所有模型中，在连接器侧观察到应力集中，并且随着牙槽骨水平的降低，在中切牙的颈侧应力增加。此外，中切牙和尖牙牙周膜上产生的平均最大和最小主应变随着牙槽骨丢失的进展而增加。此外，对皮质骨的平均最大主应力是最大的模型中最显着的骨丢失在5.10 Mpa.ConclusionsThis研究表明，脱粘和牙周组织损伤的风险可能更高时，树脂粘结固定义齿框架用于患者的牙槽骨水平降低相比，那些在健康状态。
PurposeTo investigate the risk of debonding of resin‐bonded fixed dental prosthesis frameworks and the effects on the periodontal tissue in patients with reduced alveolar bone levels.Materials and methodsThe abutment teeth were the upper central incisor and the canine. Resin‐bonded fixed dental prosthesis framework fabricated using zirconia was set to models with five different alveolar bone levels. A 200‐N load (the maximum clenching force of the anterior teeth) was applied to the center of the pontic to analyze the internal stress on the framework, adhesive cement, and periodontal tissue using finite element analysis.ResultsThe mean maximum principal stress generated in the framework was 25.33 and 29.35 MPa in the models with the normal and the lowest alveolar bone level, respectively. Regarding shear stress on the adhesive cement, stress concentration was observed on the connector side in all models, and it increased on the cervical side of the central incisor as the alveolar bone level decreased. In addition, the mean maximum and minimum principal strains generated on the periodontal ligament of the central incisor and canine tended to increase as alveolar bone loss progressed. Furthermore, the mean maximum principal stress on the cortical bone was the greatest in the model with the most significant bone loss at 5.10 MPa.ConclusionsThis study suggested that the risk of debonding and periodontal tissue damage might be higher when resin‐bonded fixed dental prosthesis frameworks were used in patients with reduced alveolar bone levels compared to those in a healthy state.