ArticleBMC oral health2025
Effect of fluid contamination on the removal torque of abutment screws.
Article in BMC oral health, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundScrew loosening is one of the most common mechanical complications of implant-supported restorations. The purpose of this study was to evaluate the effects of contamination with different liquids on the removal torque values (RTVs) in the implant‒abutment connection.
methodsA total of 66 DTI implants (6 groups, 11 implants in each group) were used. The screw holes of 55 implants were contaminated with either blood from a 29-year-old female donor (BG), saliva (SG), a blood and saliva mixture (BS), blood and Ankaferd Blood Stopper mixture (BA), topical anesthetic (TA), and the remaining noncontaminated screws served as a control group (NC). Afterwards, the abutment screws were tightened to the implants via a digital torque meter (DID-4 A) with a torque of 20 Ncm. RTVs were recorded after thermocycling. The data obtained from the study were statistically evaluated via the Shapiro‒Wilk test, the Levene test, one-way analysis of variance and the Bonferroni correction.
resultsWhen the average removal torque of the groups were examined, the group with the highest average value was the control group. All contaminating agents in clinical conditions caused screw loosening.
conclusionClinicians should consider that RTVs may be affected by contamination of the implant abutment screw hole with blood, saliva, hemostatic agent or local anesthetic solution.
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