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

• Published in: Lasers in medical science Vol. 27; no. 1; pp. 7 - 14
• Main Authors: de Paula Eduardo, Carlos, Bello-Silva, Marina Stella, Moretto, Simone Gonçalves, Cesar, Paulo Francisco, de Freitas, Patricia Moreira
• Format: Journal Article
• Language: English
• Published: London Springer-Verlag 2012; Springer Nature B.V
• Subjects: Abrasion resistance; Alumina; Aluminum oxide; Aluminum Oxide - chemistry; Bonding strength; Ceramics; Ceramics - chemistry; Composite materials; Composite Resins - chemistry; Composite Resins - radiation effects; Conditioning; Dental Bonding; Dental Porcelain - chemistry; Dentistry; Glass - chemistry; Lasers; Lasers, Solid-State; Medicine; Medicine & Public Health; Optical Devices; Optics; Original Article; Photonics; Polymers; Quantum Optics; Resin Cements - chemistry; Resin Cements - radiation effects; Resins; Silicon Dioxide - chemistry; Tensile Strength; Glass-infiltrated alumina composite; Surface conditioning; Tribochemical silica-coating; Er,Cr:YSGG laser; Microtensile bond strength
• ISSN: 0268-8921; 1435-604X
• DOI: 10.1007/s10103-010-0822-9

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.