Annals and Essences of Dentistry
Open Access

Abstract

AN INVITRO EVALUATION OF THE EFFECT OF ZIRCONIA SURFACE TREATMENT ON SHEAR BOND STRENGTH TO A RESIN CEMENT

Deepak Thomas

Statement Of Problem;Developments in ceramic core materials such as lithium disilicate, aluminium oxide, and zirconium oxide have allowed more widespread application of all-ceramic restorations over the past 10 years. However, establishing a reliable bond of resin cement to zirconia based materials has been proven to be difficult, which is the major limitation against fabricating zirconia restoration , and there is no clear recommendation in the literature regarding surface treatment before bonding. Purpose; This study evaluated the effect of zirconia surface treatments namely Airborne Particle Abrasion, Hydrofluoric acid etching, Hydrofluoric acid etching followed by silanation and Primer application on shear bond strength to a self etch dual cure resin cement bonded to dentin specimens. Material And Methods; Twenty zirconia rods (3 x 2.5 mm) were prepared from zirconia blocks and assigned into 5 groups. Each group were subjected to the following surface treatments. (1) group I - Control ( C ) no treatment , (2) group II - airborne-particle abrasion (APA), (3) group III – hydrofluoric acid etching ( HF ), (4) group IV - hydrofluoric acid etching followed by silanation ( HF/S ), and (5) group V - application of zirconia primer ( Z ) . Dentin specimens were prepared from extracted molars stored in 0.5% chloramine-T. Zirconia rods were bonded to dentin using a resin cement (Multilink Speed), then light polymerized. The specimens were loaded to failure with the notched shear bond test method in a universal loading apparatus. Results were analyzed using 1-way ANOVA (alpha=.05). Results;ANOVA showed significant differences in bond strength among the different surface treatments ( p value 0.001). The highest values were obtained with group V (Z) ( 8.66 Mpa) followed by group II (APA) (6.71 Mpa ), group IV (HF/S) (4.41 Mpa) . The least values were obtained for group III (HF) (3.88 Mpa ) and there were no significant difference ( p value 0.53 ) between group III (HF) ( 3.88 Mpa ) and group I (C) (3.70 Mpa).Conclusion:The resin bond to Y-TZP was improved by surface treatment. Zirconia Primer application is practically a reliable surface treatment . Airborne Particle Abrasion , although not so reliable , is also an effective treatment while bonding zirconia to a resin cement .

Published Date: 2013-03-31;