Ebadian Behnaz, Fathi Amirhossein, Khodadad Saba
Dental Implants Research Center, Dental Research Institue, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Dental Material Research Center, Dental Research Institue, Department of Prosthodontics, Isfahan University of Medical Sciences, Isfahan, Iran.
Int J Dent. 2021 Jul 19;2021:3595064. doi: 10.1155/2021/3595064. eCollection 2021.
The complications of implant-supported prostheses can be classified into mechanical and biological ones, one part of which is associated with screw loosening. This study was aimed to compare the effect of four different abutment screw torque techniques on screw loosening in single implant-supported prostheses following the application of mechanical loading.
In this experimental study, a total of 40 implants in acrylic blocks (6 × 10 × 20 mm) were mounted perpendicular to the surface. They were then randomly divided into four groups: (1) torquing once with 30 Ncm, (2) torquing three times with 30 Ncm and 5-minute intervals, (3) torquing once with 30 Ncm, opening the screw, and retorquing with 30 Ncm, and (4) torquing once with 35 Ncm. The torque values were confirmed by using a digital torque meter. Then, the samples underwent a force (2 cps, 0.453-11.793 kg) for three hours before the measurement of detorque values. The screw loosening force (torque) was then measured and recorded. The obtained data were analyzed by SPSS (version 22) software using one-way ANOVA and Tukey post hoc test at a 5% error level.
The maximum mean detorque values of the abutment screws in single implant-supported prostheses were reported for groups 4 (27.8 ± 1.3), 1 (26.8 ± 1.3), and 3 (25.1 ± 1.3), and the minimum mean detorque value was found in group 2 (24.9 ± 1.2). Moreover, no significant difference was observed between groups 2 and 3 ( > 0.05), but a significant difference was found between groups 1 and 3 and other groups ( < 0.05).
The increase in the torque value increased the torque loss. However, the detorque value in group 4 showed the least difference with the value recommended by the manufacturer (30 Ncm).
种植体支持式修复体的并发症可分为机械性和生物性并发症，其中一部分与螺钉松动有关。本研究旨在比较四种不同基台螺钉扭矩技术对单颗种植体支持式修复体在机械加载后螺钉松动的影响。
在本实验研究中，共40颗种植体垂直安装在丙烯酸块（6×10×20mm）中。然后将它们随机分为四组：（1）用30Ncm扭矩拧紧一次；（2）用30Ncm扭矩拧紧三次，间隔5分钟；（3）用30Ncm扭矩拧紧一次，松开螺钉，再用30Ncm扭矩重新拧紧；（4）用35Ncm扭矩拧紧一次。扭矩值用数字扭矩计确认。然后，在测量拧松扭矩值之前，样本承受三小时的力（2次/秒，0.453 - 11.793kg）。然后测量并记录螺钉松动力（扭矩）。使用SPSS（22版）软件对获得的数据进行单因素方差分析和Tukey事后检验，误差水平为5%。
单颗种植体支持式修复体中，基台螺钉的最大平均拧松扭矩值在第4组（27.8±1.3）、第1组（26.8±1.3）和第3组（25.1±1.3）中报告，最小平均拧松扭矩值在第2组（24.9±1.2）中发现。此外，第2组和第3组之间未观察到显著差异（>0.05），但第1组和第3组与其他组之间存在显著差异（<0.05）。
扭矩值的增加会增加扭矩损失。然而，第4组的拧松扭矩值与制造商推荐值（30Ncm）的差异最小。
