Mechanical behavior of single-layer ceramized zirconia abutments for dental implant prosthetic rehabilitation
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Jiménez Melendo, Manuel; Llena Blasco, Oriol; Bruguera Alvarez, August; Llena Blasco, Jaime; Yáñez Vico, Rosa María; García Calderón, Manuel; Vaquero Aguilar, Cristina; Velázquez Cayón, Rocío; Gutiérrez Pérez, José Luis; Torres Lagares, Daniel
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Aquest document és un/a article, creat/da en: 2014
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Objectives: This study was undertaken to characterize the mechanical response of bare (as-received) and single-
layer ceramized zirconia abutments with both internal and external connections that have been developed to enhan
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ced aesthetic restorations.
Material and Methods: Sixteen zirconia implant abutments (ZiReal Post®, Biomet 3i, USA) with internal and ex
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ternal connections have been analyzed. Half of the specimens were coated with a 0.5mm-thick layer of a low-fusing
fluroapatite ceramic. Mechanical tests were carried out under static (constant cross-head speed of 1mm/min until
fracture) and dynamic (between 100 and 400N at a frequency of 1Hz) loading conditions. The failure location was
identified by electron microscopy. The removal torque of the retaining screws after testing was also evaluated.
Results: The average fracture strength was above 300N for all the abutments, regardless of connection geometry
and coating. In most of the cases (94%), failure occurred by abutment fracture. No significant differences were
observed either in fatigue behavior and removal torque between the different abutment groups.
Conclusions: Mechanical behavior of Zireal zirconia abutments is independent of the type of internal/external
connection and the presence/absence of ceramic coating. This may be clinically valuable in dental rehabilitation to
improve the aesthetic outcome of zirconia-based dental implant systems.
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