Effect of acid and laser etching on shear bond strength of conventional and resin-modified glass-ionomer cements to composite resin

• Published in: Lasers in medical science Vol. 27; no. 2; pp. 305 - 311
• Main Authors: Navimipour, Elmira Jafari, Oskoee, Siavash Savadi, Oskoee, Parnian Alizadeh, Bahari, Mahmoud, Rikhtegaran, Sahand, Ghojazadeh, Morteza
• Format: Journal Article
• Language: English
• Published: London Springer-Verlag 01.03.2012; Springer Nature B.V
• Subjects: Acid Etching, Dental; Bond strength; Composite materials; Composite Resins - chemistry; Dental Bonding; Dental Materials - chemistry; Dentistry; Epoxy resins; Glass Ionomer Cements - chemistry; Laser etching; Lasers; Lasers, Solid-State; Medicine; Medicine & Public Health; Optical Devices; Optics; Original Article; Phosphoric Acids - chemistry; Photonics; Quantum Optics; Resin Cements - chemistry; Shear Strength; Phosphoric acid; Er,Cr:YSGG laser; Sandwich technique; Surface treatment
• ISSN: 0268-8921; 1435-604X
• DOI: 10.1007/s10103-010-0868-8

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-μm-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/cm 2 . 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 ×20.