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KMID : 1034420140390040296
Restorative Dentistry & Endodontics
2014 Volume.39 No. 4 p.296 ~ p.302
Bond strength of resin cement to CO2 and Er:YAG laser-treated zirconia ceramic
Kasraei Shahin

Rezaei-Soufi Loghman
Heidari Bijan
Vafaee Fariborz
Abstract
Objectives: It is difficult to achieve adhesion between resin cement and zirconia ceramics using routine surface preparation methods. The aim of this study was to evaluate the effects of CO2 and Er:YAG laser treatment on the bond strength of resin cement to zirconia ceramics.

Materials and Methods: In this in-vitro study 45 zirconia disks (6 mm in diameter and 2 mm in thickness) were assigned to 3 groups (n = 15). In control group (CNT) no laser treatment was used. In groups COL and EYL, CO2 and Er:YAG lasers were used for pretreatment of zirconia surface, respectively. Composite resin disks were cemented on zirconia disk using dual-curing resin cement. Shear bond strength tests were performed at a crosshead speed of 0.5 mm/min after 24 hr distilled water storage. Data were analyzed by one-way ANOVA and post hoc Tukey's HSD tests.

Results: The means and standard deviations of shear bond strength values in the EYL, COL and CNT groups were 8.65 ¡¾ 1.75, 12.12 ¡¾ 3.02, and 5.97 ¡¾ 1.14 MPa, respectively. Data showed that application of CO2 and Er:YAG lasers resulted in a significant higher shear bond strength of resin cement to zirconia ceramics (p < 0.0001). The highest bond strength was recorded in the COL group (p < 0.0001). In the CNT group all the failures were adhesive. However, in the laser groups, 80% of the failures were of the adhesive type.

Conclusions: Pretreatment of zirconia ceramic via CO2 and Er:YAG laser improves the bond strength of resin cement to zirconia ceramic, with higher bond strength values in the CO2 laser treated samples.
KEYWORD
CO2 laser, Er:YAG laser, Resin cement, Zirconium oxide
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