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首页> 外文期刊>The Journal of Prosthetic Dentistry >Stress distribution of inlay-anchored adhesive fixed partial dentures: A finite element analysis of the influence of restorative materials and abutment preparation design.
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Stress distribution of inlay-anchored adhesive fixed partial dentures: A finite element analysis of the influence of restorative materials and abutment preparation design.

机译：镶嵌锚固固定式局部义齿的应力分布：修复材料和基台制备设计影响的有限元分析。

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Statement of Problem. Indirect composite or ceramic fixed partial dentures (FPDs) have become an alternative to conventional metal-ceramic adhesive fixed partial dentures (AFPDs). Little information about the adequate restorative material and tooth preparation design for inlay-anchored AFPDs is available to the clinician. Purpose. The purposes of this simulation study were: (1) to use 2-dimensional finite element modeling to simulate stresses at the surface and interface of 3-unit posterior AFPDs made with 6 different restorative materials, and (2) to investigate the influence of 3 different abutment preparation configurations on the stress distribution within the tooth/restoration complex. Material and Methods. A mesio-distal cross-section of a 3-unit AFPD was digitized and used to create 2-dimensional models of the periodontal membrane, supporting bone, different restorative materials (gold, alumina, zirconia, glass-ceramic, composite, and fiber-reinforced composite), and different abutment preparation configurations (interproximal slots vs. 2-surface [MO, DO] vs. 3-surface [MOD]). A simulated 50-N vertical occlusal load was applied to the standardized pontic element. The principal stress within the restorative materials, stresses at the tooth/restoration interface, and surface tangential stresses at the level of the pontic were calculated in MPa from the postprocessing files and compared to each other. Results. All materials and tooth preparation design exhibited a similar stress pattern, with a definite compressive area at the occlusal side of the pontic, a tensile zone at the gingival portion of the pontic, and tensile stress peaks in the abutment/pontic connection areas. Among isotropic materials, standard non-reinforced composites exhibited better stress transfer and reduced tensile stresses at the adhesive interface than ceramics and gold. Optimized placement of the glass fibers within the composite resulted in similar stress distribution when tested in 2-surface abutment preparation configuration. There was no detectable influence of preparation design on the behavior of the pontic area. Among all 3 preparation designs, only the DO design exhibited almost pure compression at the interface. Conclusion. Within the limitations of this simulation experiment, the composite materials tested demonstrated a resilient component that favored stress transfer within the tooth/restoration complex. Their clinical use, however, may be contraindicated due to insufficient strength and fracture toughness. The addition of extremely tough fibers to composites represents the most promising combination. Clinical trials are required to ensure that veneering composite can survive under clinical conditions.
机译：问题陈述。间接复合或陶瓷固定局部义齿（FPD）已成为常规金属陶瓷粘合剂固定局部义齿（AFPD）的替代方法。临床医生几乎没有关于镶嵌固定的AFPD的足够的修复材料和牙齿准备设计的信息。目的。该模拟研究的目的是：（1）使用二维有限元建模来模拟由6种不同修复材料制成的3单元后AFPD的表面和界面上的应力，以及（2）研究3牙齿/修复复合体内应力分布的不同基台准备配置。材料与方法。将3单位AFPD的近中横截面数字化，并用于创建牙周膜的二维模型，支持骨骼，不同的修复材料（金，氧化铝，氧化锆，玻璃陶瓷，复合材料和纤维-增强复合材料）和不同的基台准备配置（齿间槽与2面[MO，DO]与3面[MOD]）。将模拟的50 N垂直咬合载荷施加到标准化的桥体上。从后处理文件中以MPa计算恢复材料中的主应力，牙齿/恢复界面处的应力以及桥体水平的表面切向应力，并将它们相互比较。结果。所有材料和牙齿准备设计均表现出相似的应力模式，在桥体的咬合侧具有确定的压缩区域，在桥体的牙龈部分具有拉伸区域，而在基台/桥体的连接区域具有拉伸应力峰值。在各向同性材料中，与陶瓷和金相比，标准的非增强复合材料在胶粘剂界面处表现出更好的应力传递和减小的拉应力。在2面基台准备配置中进行测试时，玻璃纤维在复合材料内的优化放置导致相似的应力分布。制剂设计对脑桥区域的行为没有可检测的影响。在所有三种准备设计中，只有DO设计在界面处表现出几乎纯的压缩。结论。在此模拟实验的限制范围内，测试的复合材料展示了一种弹性组件，该组件有利于在牙齿/修复复合体内部进行应力转移。然而，由于强度和断裂韧性不足，它们的临床用途可能是禁忌的。向复合材料中添加极硬的纤维是最有前途的组合。需要进行临床试验以确保饰面复合材料可以在临床条件下存活。

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