Resumen de Mechanical behavior of single-layer ceramized zirconia abutments for dental implant prosthetic rehabilitation
Manuel Jiménez Melendo, Oriol Llena Blasco, August Bruguera Álvarez, Jaime Llena Blasco, Rosa María Yáñez Vico, Manuel García Calderón, Cristina Vaquero Aguilar, Rocío Velázquez Cayón, José Luis Gutiérrez Pérez, Daniel Torres Lagares
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 - ced aesthetic restorations.
Material and Methods: Sixteen zirconia implant abutments (ZiReal Post®, Biomet 3i, USA) with internal and ex - 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.
