Tavakolizadeh Sara, Ahmadi Navid, Rezaeimajd Maryam, Ghoveizi Rahab, Heidari Bijan, Shahri Fereshteh, Khaledi Amiralireza
Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.f.
Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
J Long Term Eff Med Implants. 2025;35(3):53-62. doi: 10.1615/JLongTermEffMedImplants.2025055792.
Despite the generally high success rate of dental implant treatments, some complications may also occur. One of the most common mechanical problems is screw loosening of the abutment. This study aims to assess the impact of abutment type (original vs. non-original) and angle of abutment (angled vs. straight) on torque reduction and screw loosening under cyclic loading conditions. Thirty titanium implants were divided into three groups (n = 10): original straight abutments, non-original straight abutments, and original 15° angled abutments. Each implant, and its respective abutments, were embedded in prepared acrylic blocks and torqued to 25 N.cm. twice, with a 10-minute interval between each torque application. Reverse torque values (RTV) were evaluated before and after 500,000 cycles of cycling loading at 75 Hz with a 100 N load, using an electrical torque meter. Data analysis was conducted using SPSS software (version 21), employing descriptive statistics, ANOVA, and independent t-tests. After cyclic loading, the mean RTV was 18.41 ± 1.86 N.cm in the group of original straight abutments, 13.18 ± 1.75 N.cm in the group of non-original straight abutments, and 14.76 ± 1.04 N.cm in original 15° angled abutments. Statistically significant differences were observed in mean RTV between the two groups of original and non-original abutments as well as between angled and straight abutments (< 0.001). Original straight abutments demonstrated lower torque loss after cyclic loading compared with both non-original and 15° angled abutments. The findings suggest that using original straight abutments may have better outcomes in preventing screw loosening and ensuring proper performance in clinical settings. However, it is essential to thoughtfully evaluate alternative abutment types and angles when necessary.
尽管牙种植治疗的总体成功率较高，但仍可能出现一些并发症。最常见的机械问题之一是基台螺丝松动。本研究旨在评估基台类型（原装与非原装）和基台角度（角度与直型）对循环加载条件下扭矩降低和螺丝松动的影响。将30颗钛种植体分为三组（n = 10）：原装直型基台、非原装直型基台和原装15°角基台。每个种植体及其相应的基台嵌入制备好的丙烯酸块中，并分两次扭紧至25 N.cm，每次扭矩施加之间间隔10分钟。使用电动扭矩计在75 Hz、100 N载荷下进行500,000次循环加载前后评估反向扭矩值（RTV）。使用SPSS软件（版本21）进行数据分析，采用描述性统计、方差分析和独立t检验。循环加载后，原装直型基台组的平均RTV为18.41±1.86 N.cm，非原装直型基台组为13.18±1.75 N.cm，原装15°角基台组为14.76±1.04 N.cm。原装与非原装基台两组之间以及角度与直型基台之间的平均RTV存在统计学显著差异（<0.001）。与非原装和15°角基台相比，原装直型基台在循环加载后扭矩损失更低。研究结果表明，在临床环境中使用原装直型基台在预防螺丝松动和确保正常性能方面可能有更好的效果。然而，必要时仔细评估替代基台类型和角度至关重要。
