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Determination of fluid leakages in the different screw-retained implant-abutment connections in a mechanical artificial mouth
Martin Gili, D.; Molmeneu Trias, Meritxell; Fernández Yagüe, Marc-Antoni; Punset Fusté, Miquel; Giner, Li; Armengou, Jaume; Gil Mur, Francisco Javier
Universitat Politècnica de Catalunya. Departament de Ciència dels Materials i Enginyeria Metal·lúrgica; Universitat Politècnica de Catalunya. BIBITE - Biomaterials, Biomecànica i Enginyeria de Teixits
This study shows the potential risk of microfiltration between two different types of implant-abutment connections screwed at 45 Ncm: external and internal. For the first time the use of a mechanical artificial mouth is used with the values (compression and torsion loads with a frequency of 2 Hz) of the human chewing. The mechanical tests were performed with an artificial saliva at 37 degrees C. The microgap in the connection was measured by an Image Analysis software incorporated in a high resolution scanning electron microscopy. Implant connections were filled with methylene blue by using self-adjustable precision pipettes and the quantity of leakage was determined by high sensitivity spectometry. We showed that the internal connection has lower microgaps compared to the external ones and these microgaps increased with the number of mechanical cycles. The leakage of methylene blue was higher when the external connection was performed. Microgaps and the influence of the mechanical loads are very important for the long-term behavior avoiding the bacteria colonization in the dental implants. These aspects should be known by the implantologists.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria dels materials
Dental Implants
In-vitro evaluation
osseointegrated implants
titanium implants
Implants dentals

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