Abstract
The aim of this in vitro study was to evaluate the removal torque values on abutments and the morphological wear aspects of two different dental implant joints after immersion in a medium containing biofilm from human saliva. Twenty implant-abutment assemblies were divided into four groups in this study: (A) Morse taper free of medium containing biofilm, and (B) after contact with a medium containing biofilm from human saliva; (C) External Hexagon free of medium containing biofilm, and (D) after contact with medium containing biofilm from human saliva. The abutments were firstly torqued to the implants according to the manufacturer´s recommendations, using a handheld torque meter. Groups B and D were immersed into 24 well-plates containing 2 ml BHI medium with microorganisms for 72 h at 37 °C under microaerophilic conditions. After detorque evaluation, the abutments were removed and the implants were analyzed by scanning electron microscopy (SEM) and profilometry. On the detorque evaluation, the torque values decreased for the external hexagon implants and increased for the Morse taper implants. However, the values were lower when both implant-abutment assemblies were in contact with a medium containing biofilm from human saliva. The wear areas of contacting surfaces of the implants were identified by SEM. The highest average roughness values were recorded on the surfaces free of biofilm. The medium containing biofilm from human saliva affected the maintenance of the torque values on Morse taper and external hexagon abutments. Additionally, the removal of abutment altered the inner implant surfaces resulting in an increase of wear of the titanium-based connection.
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Acknowledgements
The authors are sincerely thankful to the Central Electron Microscopy Laboratory (LCME) at the Federal University of Santa Catarina (UFSC). The authors also aknowledge the finnancial support provided by CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) in the scope of the project PVE/CAPES/CNPq 407035/2013-3 and by FCT (Fundação para a Ciência e Tecnologia - Portugal) on the projects UID/EEA/04436/2013 and EXCL/EMS-TEC/0460/2012.
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This article have no financial affiliation from any medical device company (e.g., employment, direct payment, stock holdings, retainers, consultant ships, patent licensing arrangements or honoraria), or involvement with any commercial organization with direct financial interest in the subject or materials discussed in this manuscript, nor have any such arrangements existed in the past years. Any other potential conflict of interest is disclosed.
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Prado, A.M., Pereira, J., Silva, F.S. et al. Wear of Morse taper and external hexagon implant joints after abutment removal. J Mater Sci: Mater Med 28, 65 (2017). https://doi.org/10.1007/s10856-017-5879-6
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DOI: https://doi.org/10.1007/s10856-017-5879-6