Effect of acid and laser etching on shear bond strength of conventional and resin-modified glass-ionomer cements to composite resin
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Elmira Jafari Navimipour & Siavash Savadi Oskoee & Parnian Alizadeh Oskoee & Mahmoud Bahari & Sahand Rikhtegaran & Morteza Ghojazadeh
- چاپ و سال / کشور: 2011
Description
Success in sandwich technique procedures can be achieved through an acceptable bond between the materials. The aim of this study was to compare the effect of 35% phosphoric acid and Er,Cr:YSGG laser on shear bond strength of conventional glass-ionomer cement (GIC) and resin-modified glass-ionomer cement (RMGIC) to composite resin in sandwich technique. Sixty-six specimens were prepared from each type of glass-ionomer cements and divided into three treatment groups as follows: without pretreatment, acid etching by 35% phosphoric acid for 15 s, and 1-W Er,Cr:YSGG laser treatment for 15 s with a 600- ƒتm-diameter tip aligned perpendicular to the target area at a distance of 1 mm from the surface. Energy density of laser irradiation was 17.7 J/cm2. Two specimens in each group were prepared for evaluation under a scanning electron microscope (SEM) after surface treatment and the remainder underwent bonding procedure with a bonding agent and composite resin. Then the shear bond strength was measured at a crosshead speed of 0.5 mm/min. Two-factor analysis of variance and post-hoc Tukey test showed that the cement type, surface treatment method, and the interaction of these two factors significantly affect the shear bond strength between glass-ionomer cements and composite resin (p<0.05). Surface treatment with phosphoric acid or Er,Cr:YSGG laser increased the shear bond strength of GIC to composite resin; however, in RMGIC only laser etching resulted in significantly higher bond strength. These findings were supported by SEM results. The fracture mode was evaluated under a stereomicroscope at پ~20.
Lasers Med Sci DOI 10.1007/s10103-010-0868-8 Received: 26 February 2010 / Accepted: 30 November 2010
