Dentistry

Influence of novel zirconia surface treatments to improve zirconia-veneer bond

27^th Euro Dentistry Congress

October 25-27, 2018 | Prague, Czech Republic

Tzanakakis Emmanouil-Georgios,Tzoutzas Ioannis

University of Athens, Greece

Scientific Tracks Abstracts: Dentistry

Abstract:

The interface between Y-TZP ceramic cores and ceramic material is considered to be the weak link responsible for the high degree of veneer chipping in zirconia based restorations leading to prosthetic failures in clinical practice. Although many different techniques have been introduced to optimize zirconia veneer bond, the best method for durable zirconia restorations is still a matter of controversy. The purpose of the study was to compare different surface pretreatment methods to monolithic zirconia substrate. A single type of Y-TZP ceramic material (BruxZir Solid Zirconia, Glidewell and USA Glidewell) was used in this study. Cylindrical monolithic zirconia blocks (n=50) were prepared. Zirconia surfaces were subjected to the following processes: Without treatment; sandblasting air-abraded with crushed glass beads; air abrasion with alumina 50 ?m; air abrasion with alumina 90 ?m; and laser irradiated with femto laser. All specimens were covered with 5x5 mm veneering ceramic. All samples were loaded at the interface until fracture utilizing a shear device at a 0.5 mm/min cross-head speed. Results were statistically processed following Kruskal- Wallis and Mann Whitney tests. Alumina blasted, and laser treated groups showed significant higher values than other groups. As-sintered and glass blasted surfaces showed similar results without significant differences. Within the limitations of this study, novel femto laser treatment might be an alternative to sandblasting procedures improving the zirconia veneer bond.

Biography :

Tzanakakis Emmanouil-Georgios has completed his PhD from University of Athens, Greece and Post-doctoral studies from the University of Athens. He is the Clinical Instructor in Prosthodontics Department of Dental School of Athens, since 2007. He has published six papers in reputed Greek and international journals. He works in private practice as a Specialized Prosthodontists since 2006

E-mail: tzanakak@dent.uoa.gr