Bond strength of resin cement to CO2 and Er:YAG laser-treated zirconia ceramic
Kasraei Shahin, Rezaei-Soufi Loghman, Heidari Bijan, Vafaee Fariborz,
소속 상세정보
( Kasraei Shahin ) - Hamadan University of Medical Sciences Dental School Department of Restorative Dentistry
( Rezaei-Soufi Loghman ) - Hamadan University of Medical Sciences Dental School Department of Restorative Dentistry
( Heidari Bijan ) - Hamadan University of Medical Sciences Dental School Department of Prosthodontic
( Vafaee Fariborz ) - Hamadan University of Medical Sciences Dental School Department of Prosthodontic
KMID : 1034420140390040296
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 ± 1.75, 12.12 ± 3.02, and 5.97 ± 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.
키워드
CO2 laser; Er:YAG laser; Resin cement; Zirconium oxide
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