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01.01.2015 | Original Article

Effects of Er:YAG and Er,Cr:YSGG laser irradiation on the adhesion to eroded dentin

verfasst von: Thaysa Monteiro Ramos, Thayanne Monteiro Ramos-Oliveira, Patricia Moreira de Freitas, Nilton Azambuja Jr, Marcella Esteves-Oliveira, Norbert Gutknecht, Carlos de Paula Eduardo

Erschienen in: Lasers in Medical Science | Ausgabe 1/2015

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Abstract

Limited information is available regarding the adhesion to eroded dentin. This study aims to evaluate the effect of different surface treatments on eroded dentin morphology and on microtensile bond strength (μTBS) of adhesive systems to this substrate. Ninety-six extracted third molars were randomly divided into eight groups (n = 12) according to the type of surface treatment and the adhesive system: G1 = Control + Clearfil SE Bond [SE], G2 = Diamond bur [DB] + SE, G3 = Er:YAG laser (60 mJ, 2 Hz, 0.12 W, 19.3 J/ cm²) + SE, G4 = Er,Cr:YSGG laser (50 mJ, 30 Hz, 1.5 W, 4.5 J/ cm²) + SE, G5 = Control + Single Bond [SB], G6 = DB + SB, G7 = Er:YAG + SB, G8 = Er,Cr:YSGG + SB. The erosive cycling was performed by immersion in 0.05 M citric acid (pH 2.3, 10 min, 6x/day) and in supersaturated solution (pH 7.0, 1 h, between acid attacks), during 5 days. Blocks of composite were bonded to the samples according to the manufacturers' instructions. After 24 h-storage in distilled/deionized water (37 °C), stick-shaped samples were obtained and submitted to μTBS test. Each surface treatment was analyzed under scanning electron microscopy (n = 4) and the bond strength values (megapascal) were analyzed by two-way ANOVA and Tukey tests (α = 0.05). All surface treatments lead to changes on eroded dentin. G4 showed the highest bond strength mean (28.3 ± 9.2 MPa), which was statistically significant higher than all the other groups (p < 0.05). The surface treatment with Er,Cr:YSGG laser irradiation (4.5 J/cm²/50 mJ/30 Hz/140 μs) prior to bonding with a self-etching adhesive system significantly increases adhesion to eroded dentin, as compared to conventional treatment.

Er:YAG laser: Property of Special Laboratory of Lasers in Dentistry (LELO-FOUSP) (FAPESP grant-97/10823-0).

Er,Cr:YSGG laser: Property of Department of Operative Dentistry, Periodontology and Preventive Dentistry, RWTH Aachen University, Aachen, Germany.

Universal testing machine belong to Department of Dental Materials, School of Dentistry, University of São Paulo.

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Titel: Effects of Er:YAG and Er,Cr:YSGG laser irradiation on the adhesion to eroded dentin
verfasst von: Thaysa Monteiro Ramos
Thayanne Monteiro Ramos-Oliveira
Patricia Moreira de Freitas
Nilton Azambuja Jr
Marcella Esteves-Oliveira
Norbert Gutknecht
Carlos de Paula Eduardo
Publikationsdatum: 01.01.2015
Verlag: Springer London
Erschienen in: Lasers in Medical Science / Ausgabe 1/2015
Print ISSN: 0268-8921
Elektronische ISSN: 1435-604X
DOI: https://doi.org/10.1007/s10103-013-1321-6

Springer Medizin

Abstract

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