Madfa Ahmed A, Al-Hamzi Mohsen A, Al-Sanabani Fadhel A, Al-Qudaimi Nasr H, Yue Xiao-Guang
Department of Conservative Dentistry, Faculty of Dentistry, University of Thamar, Dhamar, Yemen.
Department of Pediatric Dentistry, Preventive Dentistry and Orthodontics, Faculty of Dentistry, University of Thamar, Dhamar, Yemen.
Springerplus. 2015 Oct 13;4:598. doi: 10.1186/s40064-015-1345-4. eCollection 2015.
This study aimed to analyse and compare the stability of two dental posts cemented with four different luting agents by examining their shear stress transfer through the FEM. Eight three-dimensional finite element models of a maxillary central incisor restored with glass fiber and Ni-Cr alloy cast dental posts. Each dental post was luted with zinc phosphate, Panavia resin, super bond C&B resin and glass ionomer materials. Finite element models were constructed and oblique loading of 100 N was applied. The distribution of shear stress was investigated at posts and cement/dentine interfaces using ABAQUS/CAE software. The peak shear stress for glass fiber post models minimized approximately three to four times of those for Ni-Cr alloy cast post models. There was negligible difference in peak of shear stress when various cements were compared, irrespective of post materials. The shear stress had same trend for all cement materials. This study found that the glass fiber dental post reduced the shear stress concentration at interfacial of post and cement/dentine compared to Ni-Cr alloy cast dental post.
本研究旨在通过有限元法（FEM）分析和比较用四种不同粘结剂粘结的两种牙桩的稳定性，研究其剪切应力传递情况。建立了八个上颌中切牙用玻璃纤维和镍铬合金铸造牙桩修复的三维有限元模型。每个牙桩分别用磷酸锌、Panavia树脂、超强粘结C&B树脂和玻璃离子材料粘结。构建有限元模型并施加100 N的斜向载荷。使用ABAQUS/CAE软件研究牙桩以及粘结剂/牙本质界面处的剪应力分布。玻璃纤维桩模型的峰值剪应力比镍铬合金铸造桩模型的峰值剪应力大约小三到四倍。比较不同粘结剂时，无论桩材料如何，峰值剪应力的差异都可忽略不计。所有粘结剂材料的剪应力趋势相同。本研究发现，与镍铬合金铸造牙桩相比，玻璃纤维牙桩降低了牙桩与粘结剂/牙本质界面处的剪应力集中。
