J Adv Prosthodont.  2021 Feb;13(1):65-70. 10.4047/jap.2021.13.1.65.

Effect of fluid contamination on reverse torque values in implant-abutment connections under oral conditions

• Mostafavi AS
• Memarian M
• Seddigh MA

• KMID: 2513168
• DOI: http://doi.org/10.4047/jap.2021.13.1.65

Abstract

Purpose
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.
Materials and Methods
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 oneway ANOVA and Tukey test.
Results
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.
Conclusion
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

Keyword

Abutment screw loosening; Fluid contamination; Blood; Saliva; Fluoride; Chlorhexidine