Lopes de Chaves E Mello Dias Eduardo Cláudio, Sperandio Marcelo, Napimoga Marcelo Henrique
Int J Oral Maxillofac Implants. 2018 May/June;33(3):505–511. doi: 10.11607/jomi.5836. Epub 2017 Sep 22.
The aim of this study was to evaluate the microgap between the abutment and implant as well as the circularity of implant platforms and associating conformational errors with bacterial microleakage in tapered connection implant systems.
Four brands of implants with a tapered abutment connection were tested. Bacterial leakage was assessed using 0.3 μL of Escherichia coli suspension inoculated into the abutment screw chamber of the implants, which were then torqued and incubated at 37°C for 14 days. All specimens used for the microbiologic experiment were then cut lengthwise, and the microgap was measured at three points on each side of the sample using scanning electron microscopy (up to 5,000× magnification). Microtomography was used to assess implant platform circularity to validate the microscopic findings qualitatively.
Two samples from the Nobel Biocare system, four from the Ankylos (Dentsply) system, four from the Neodent (Straumann) system, and five from the Conexão system were positive for bacterial leakage, with no significant difference between groups. The Neodent system had the highest mean microgap values (5.84 ± 9.83 μm), followed by the Nobel Biocare systems (5.17 ± 4.10 μm), Ankylos (3.47 ± 3.28 μm), and Conexão (2.72 ± 3.19 μm), with no significant difference between systems. All systems showed conformational errors of circularity on microtomography images.
The tapered connection systems evaluated herein were not able to halt bacterial leakage, nor were they free from conformational errors.
本研究旨在评估基台与种植体之间的微间隙、种植体平台的圆形度以及在锥形连接种植系统中与细菌微渗漏相关的构象误差。
测试了四种带有锥形基台连接的种植体品牌。使用接种到种植体基台螺丝腔中的0.3μL大肠杆菌悬液评估细菌渗漏情况，然后将种植体扭紧并在37°C下孵育14天。之后将所有用于微生物实验的样本纵向切开，使用扫描电子显微镜（放大倍数高达5000倍）在样本每一侧的三个点测量微间隙。使用显微断层扫描评估种植体平台圆形度，以定性验证微观研究结果。
诺贝尔生物科技系统的两个样本、ANKYLOS（登士柏）系统的四个样本、Neodent（士卓曼）系统的四个样本以及Conexão系统的五个样本细菌渗漏呈阳性，各组之间无显著差异。Neodent系统的平均微间隙值最高（5.84±9.83μm），其次是诺贝尔生物科技系统（5.17±4.10μm）、ANKYLOS（3.47±3.28μm）和Conexão（2.72±3.19μm），各系统之间无显著差异。所有系统在显微断层扫描图像上均显示出圆形度的构象误差。
本文评估的锥形连接系统无法阻止细菌渗漏，也存在构象误差。
