Byun Soo-Hwan, Seo Joung-Hwa, Cho Ran-Yeong, Yi Sang-Min, Kim Lee-Kyong, Han Hyun-Sook, On Sung-Woon, Kim Won-Hyeon, An Hyun-Wook, Yang Byoung-Eun
Department of Oral and Maxillofacial Surgery, Hallym University Sacred Heart Hospital, Anyang 14068, Korea.
Graduate School of Clinical Dentistry, Hallym University, Chuncheon 24252, Korea.
Bioengineering (Basel). 2022 Sep 20;9(10):483. doi: 10.3390/bioengineering9100483.
(1) Background: The stability of implants plays a significant role in the success of osseointegration. The stability of the connection between the fixture and the abutment is one of the critical factors affecting osseointegration. When restoring multiple, non-parallel, and splinted implants, achieving a passive fit can be complicated and challenging. A new EZ post non-engaging abutment system of the BlueDiamond (BD) implant allows a wide connection angle while achieving a passive prosthesis fit. This study aimed to confirm the new abutment system's clinical applicability by evaluating its biomechanical characteristics using finite element analysis (FEA). (2) Methods: The implant-supported fixed three-unit dental prostheses model was reproduced for two groups of AnyOne (AO) and BD implants using FEA. The loading conditions were a preload of 200 N in the first step and loads of 100 N (axial), 100 N (15°), or 30 N (45°) in the second step. (3) Results: The peak Von Mises stress (PVMS) value of the fixture in the BD group was more than twice that in the AO group. In contrast, the PVMS values of the abutment and abutment screws were lower in the BD group than in the AO group. The AO group revealed higher maximal principal stress (MPS) values than that of the BD group in the cortical bone, cancellous bone, and crown. The average stress of the outer surface of the abutment was lower in the AO group than in the BD group. The stress distribution for the inner surface of the fixture confirmed that the BD group displayed a lower stress distribution than the AO group under axial and 15° loads; however, the average stress was 1.5 times higher at the 45° load. The stress values of the entire surface where the cortical and cancellous bone were in contact with the fixture were measured. The AO group showed a higher stress value than the BD group in both cortical and cancellous bone. (4) Conclusions: In the AO group, the PVMS value of the fixture and the stress distribution at the contact surface between the fixture and the abutment were lower than those of the BD group, suggesting that the stability of the fixture would be high. However, due to the high stress in the fastening area of the abutment and abutment screw, the risk of abutment fracture in the AO group is higher than that of the BD group. Therefore, the new EZ post non-engaging abutment of the BD implant can be used without any problems in clinics, similar to the non-engaging abutment of the AO implant, which has been widely used in clinical practice.
(1) 背景：种植体的稳定性在骨结合成功中起着重要作用。种植体与基台之间连接的稳定性是影响骨结合的关键因素之一。在修复多个、不平行且联冠的种植体时，实现被动就位可能复杂且具有挑战性。BlueDiamond（BD）种植体的新型EZ桩非就位基台系统允许较大的连接角度，同时实现假体的被动就位。本研究旨在通过有限元分析（FEA）评估其生物力学特性，以确认新型基台系统的临床适用性。(2) 方法：使用FEA对两组AnyOne（AO）和BD种植体的种植体支持的固定三联牙修复体模型进行再现。加载条件为第一步预加载200 N，第二步加载100 N（轴向）、100 N（15°）或30 N（45°）。(3) 结果：BD组种植体的峰值冯·米塞斯应力（PVMS）值是AO组的两倍多。相比之下，BD组基台和基台螺钉的PVMS值低于AO组。AO组在皮质骨、松质骨和牙冠中的最大主应力（MPS）值高于BD组。AO组基台外表面的平均应力低于BD组。种植体内表面的应力分布证实，在轴向和15°加载下，BD组的应力分布低于AO组；然而，在45°加载时，平均应力高出1.5倍。测量了皮质骨和松质骨与种植体接触的整个表面的应力值。AO组在皮质骨和松质骨中的应力值均高于BD组。(4) 结论：在AO组中，种植体的PVMS值以及种植体与基台接触表面的应力分布低于BD组，表明种植体的稳定性较高。然而，由于基台和基台螺钉紧固区域的应力较高，AO组基台骨折的风险高于BD组。因此，BD种植体的新型EZ桩非就位基台在临床上使用时不会有任何问题，类似于已在临床实践中广泛使用的AO种植体的非就位基台。
