Microtensile bond strength of composite resin to glass-infiltrated alumina composite conditioned with Er,Cr:YSGG laser

Abstract

Tribochemical silica-coating is the recommended conditioning method for improving glass-infiltrated alumina composite adhesion to resin cement. High-intensity lasers have been considered as an alternative for this purpose. This study evaluated the morphological effects of Er,Cr:YSGG laser irradiation on aluminous ceramic, and verified the microtensile bond strength of composite resin to ceramic following silica coating or laser irradiation. In-Ceram Alumina ceramic blocks were polished, submitted to airborne particle abrasion (110 μm Al(2)O(3)), and conditioned with: (CG) tribochemical silica coating (110 μm SiO(2)) + silanization (control group); (L1-L10) Er,Cr:YSGG laser (2.78 μm, 20 Hz, 0.5 to 5.0 W) + silanization. Composite resin blocks were cemented to the ceramic blocks with resin cement. These sets were stored in 37°C distilled water (24 h), embedded in acrylic resin, and sectioned to produce bar specimens that were submitted to microtensile testing. Bond strength values (MPa) were statistically analyzed (α ≤0.05), and failure modes were determined. Additional ceramic blocks were conditioned for qualitative analysis of the topography under SEM. There were no significant differences among silicatization and laser treatments (p > 0.05). Microtensile bond strength ranged from 19.2 to 27.9 MPa, and coefficients of variation ranged from 30 to 55%. Mixed failure of adhesive interface was predominant in all groups (75-96%). No chromatic alteration, cracks or melting were observed after laser irradiation with all parameters tested. Surface conditioning of glass-infiltrated alumina composite with Er,Cr:YSGG laser should be considered an innovative alternative for promoting adhesion of ceramics to resin cement, since it resulted in similar bond strength values compared to the tribochemical treatment.

Effect of thermocycling on the bond strength of composite resin to bur and laser treated composite resin

“…The treatments to roughen the surface include roughing with burs, acid etching with hydrofluoric or phosphoric acid, and air-borne particle abrasion [8,9]. Most recently, researchers have focused on the efficiency of lasers for composite repair bond strength [10][11][12][13].…”

Surface topography and bond strengths of feldspathic porcelain prepared using various sandblasting pressures

“…Today, the use of materials that are aesthetically acceptable has become more popular in restorative dentistry . Ceramics are the most aesthetic materials available in restorative dentistry.…”

“…For this purpose, a standard method with optimal power and strength is needed to prepare the porcelain surface for repair without any detrimental effects . Many studies on the efficacy of ceramic surface treatment using burs, etching with hydrofluoric acid (HF), phosphoric acid, accidulated phosphate fluoride, ammonium bifluoride, lasers (CO 2 , Er‐YAG, ND‐YAG, Er,Cr‐YSGG) and sandblasting have been published that reportedly increase the bond strength of resin material to porcelain …”

Lasers in Esthetic Dentistry: Soft Tissue Photobiomodulation, Hard Tissue Decontamination, and Ceramics Conditioning

“…More recently, high power lasers have been investigated for potential use on ceramic conditioning. There are still few studies in the literature about laser treatment of dental ceramics; however, the results indicate that high power lasers can provide similar or even higher bond strength values than those obtained with Rocatec System when adequate irradiation parameters were used [3, 4, 43]. Despite the promising results regarding laser conditioning of high-crystalline ceramics, several studies in the literature do not report this increase in bond strength.…”

“…Studies have reported their promising results when used for the treatment/irradiation of the inner surface of ceramic restorations [2–4], as well as for the microbial reduction at the dentin surface and subsurface [5–9]. On the other hand, low power lasers are used for modulation of inflammatory process, pain reduction, and soft tissue biomodulation [10–17].…”