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. 2014 Feb;6(1):35-8.
doi: 10.4047/jap.2014.6.1.35. Epub 2014 Feb 14.

Correlation between microleakage and screw loosening at implant-abutment connection

Cem Sahin  1 , Simel Ayyildiz  2
Affiliations

Correlation between microleakage and screw loosening at implant-abutment connection

Cem Sahin et al. J Adv Prosthodont. 2014 Feb.

Abstract

Purpose: This study aimed to evaluate the correlation between microleakage and screw loosening at different types of implant-abutment connections and/or geometries measuring the torque values before and after the leakage tests.

Materials and methods: Three different abutment types (Intenal hex titanium, internal hex zirconium, morse tapered titaniuım) with different geometries were connected to its own implant fixture. All the abutments were tightened with a standard torque value then the composition was connected to the modified fluid filtration system. After the measurements of leakage removal torque values were re-measured. Kruskal-wallis test was performed for non-parametric and one-way ANOVA was performed for parametric data. The correlation was evaluated using Spearman Correlation Test (α=0.05).

Results: Significantly higher microleakage was found at the connection of implant-internal hex zirconium abutment. Observed mean torque value loss was also significantly higher than other connection geometries. Spearman tests revealed a significant correlation between microleakage and screw loosening.

Conclusion: Microleakage may provoke screw loosening. Removing torque values rationally decrease with the increase of microleakage.

Keywords: Implant-abutment connection; Microleakage; Screw loosening.

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Figures

Fig. 1
Fig. 1
Schematic view of microleakage throuh the screw threads and implant-abutment interface.
See this image and copyright information in PMC

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