Mostafavi Azam Sadat, Memarian Maryam, Seddigh Mohammad Ali
Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
J Adv Prosthodont. 2021 Feb;13(1):65-70. doi: 10.4047/jap.2021.13.1.65. Epub 2021 Feb 23.
Implant mechanical complications, including screw loosening, can influence dental implant success. It has been shown that torque values are affected by contamination occurred in implant-abutment (I/A) interface. This study aimed to examine the effects of blood, saliva, fluoride and chlorhexidine contamination on reverse torque values (RTVs) of abutment screws in oral conditions.
50 fixtures were mounted into the stainless-steel holders and divided into five groups (n = 10). Except control group (NC), fixture screw holes in other groups were contaminated with chlorhexidine (CG), saliva (SG), blood (BG), or fluoride (FG). Abutment screws were tightened with a digital torque meter. I/A assemblies were subjected to thermocycling and cyclic loading. The mean RTVs were recorded and data were analyzed with one-way ANOVA and Tukey test.
Except for specimens in SG (20.56 ± 1.33), other specimens in BG (21.11 ± 1.54), CG (22.89 ± 1.1) and FG (24.00 ± 1.12) displayed significantly higher RTVs compared to NC (19.00 ± 1.87). The highest RTVs were detected in CG and FG.
The obtained data robustly suggest that RTVs were significantly affected by fluid contaminations. Specimens in FG and CG displayed the highest RTVs. Therefore, clinicians should have enough knowledge about probable contaminations in I/A interface in order to manage them during clinical procedure and to inform patients about using oral care products.
种植体机械并发症，包括螺钉松动，会影响牙种植体的成功率。研究表明，扭矩值会受到种植体-基台（I/A）界面污染的影响。本研究旨在探讨血液、唾液、氟化物和氯己定污染对口腔条件下基台螺钉反向扭矩值（RTVs）的影响。
将50个种植体固定于不锈钢支架上，分为五组（n = 10）。除对照组（NC）外，其他组的种植体螺孔分别用氯己定（CG）、唾液（SG）、血液（BG）或氟化物（FG）污染。用数字扭矩计拧紧基台螺钉。对I/A组件进行热循环和循环加载。记录平均RTVs，并采用单因素方差分析和Tukey检验对数据进行分析。
除SG组标本（20.56 ± 1.33）外，BG组（21.11 ± 1.54）、CG组（22.89 ± 1.1）和FG组（24.00 ± 1.12）的其他标本与NC组（19.00 ± 1.87）相比，RTVs显著更高。CG组和FG组的RTVs最高。
所得数据有力地表明，RTVs受液体污染的显著影响。FG组和CG组的标本显示出最高的RTVs。因此，临床医生应充分了解I/A界面可能存在的污染情况，以便在临床操作过程中加以处理，并告知患者使用口腔护理产品的相关信息。
