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Should adhesive debonding be simulated for intra-radicular post stress analyses?
Dental Materials ( IF 5 ) Pub Date : 2018-06-23 , DOI: 10.1016/j.dental.2018.06.025
Ricardo A. Caldas , Atais Bacchi , Valentim A.R. Barão , Antheunis Versluis

Objective

Elucidate the influence of debonding on stress distribution and maximum stresses for intra-radicular restorations.

Methods

Five intra-radicular restorations were analyzed by finite element analysis (FEA): MP = metallic cast post core; GP = glass fiber post core; PP = pre-fabricated metallic post core; RE = resin endocrowns; CE = single piece ceramic endocrown. Two cervical preparations were considered: no ferule (f0) and 2 mm ferule (f1). The simulation was conducted in three steps: (1) intact bonds at all contacts; (2) bond failure between crown and tooth; (3) bond failure among tooth, post and crown interfaces. Contact friction and separation between interfaces was modeled where bond failure occurred. Mohr–Coulomb stress ratios (σMC ratio) and fatigue safety factors (SF) for dentin structure were compared with published strength values, fatigue life, and fracture patterns of teeth with intra-radicular restorations.

Results

The σMC ratio showed no differences among models at first step. The second step increased σMC ratio at the ferule compared to step 1. At the third step, the σMC ratio and SF for f0 models were highly influenced by post material. CE and RE models had the highest values for σMC ratio and lower SF. MP had the lowest σMC ratio and higher SF. The f1 models showed no relevant differences among them at the third step.

Significance

FEA most closely predicted failure performance of intra-radicular posts when frictional contact was modeled. Results of analyses where all interfaces are assumed to be perfectly bonded should be considered with caution.



中文翻译:

是否应该模拟胶粘剂的脱胶性以进行根管内的后应力分析?

客观的

阐明脱胶对根管内修复体的应力分布和最大应力的影响。

方法

通过有限元分析(FEA)分析了五个根管内修复体:MP =金属铸件型芯;GP =玻璃纤维桩芯;PP =预制金属柱芯;RE =树脂内冠;CE =单件陶瓷内冠。考虑了两种宫颈制剂:无阿魏(f 0)和2毫米阿魏(f 1)。模拟过程分三个步骤进行:(1)在所有触点上保持完整的键合;(2)牙冠与牙齿之间的粘结失败;(3)牙齿,牙柱和牙冠界面之间的粘结失效。在发生粘结失效的地方对接触摩擦和界面之间的分离进行了建模。莫尔-库仑应力比(σMC)和用于牙本质结构的疲劳安全系数(SF)与已发表的强度值,疲劳寿命和带有根管内修复物的牙齿的骨折类型进行了比较。

结果

所述σ MC比显示出在第一步骤模型之间没有差异。与步骤1相比,第二步增加了Ferule处的σMC比率。在第三步中,f 0模型的σMC比率和SF受到后置材料的强烈影响。CE和RE模型的σMC比值最高,而SF值较低。MP的σMC最低,而SF较高。f 1模型在第三步中没有显示出相关差异。

意义

当对摩擦接触进行建模时,FEA最紧密地预测了放射状内柱的失效性能。假设所有接口都被认为是完美结合的分析结果,应谨慎考虑。

更新日期:2018-06-23
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