Abstract
Objective: This in vitro study measured the microshear bond strength (µSBS) of a composite resin to sound and artificially eroded dentin, submitted to surface treatment with diamond bur (DB) or Er,Cr:YSGG laser (L). Material and Methods: Bovine dentin samples were randomly divided into six groups (n=11): G1-sound dentin, G2-eroded dentin, G3-eroded dentin treated with Er,Cr:YSGG laser at 1.5W, G4-eroded dentin treated with Er,Cr:YSGG laser at 2.0W, G5-eroded dentin treated with Er,Cr:YSGG laser at 2.5W and G6-eroded dentin treated with diamond bur. Erosive cycling was performed by immersion in 0.05M citric acid (pH2.3;10min; 6x/day) and in remineralizing solution (pH7.0, 1h, between acid attacks), for 5 days. Three composite resin cylinders were bonded to the samples and after 24h storage in distilled/deionized water (37oC), samples were submitted to microshear bond strength test and mean values (MPa) were analyzed by one-way ANOVA and Tukey tests (?=0.05). Results: G1 (19.9±7.6) presented the highest µSBS mean followed by G6 (12.2±3.8), which showed no statistically significant difference compared with the other groups, except from G4. The lowest µSBS value was found for G4 (7.1±1.5), which did not differ statistically from G2 (7.5±1.8), G3 (8.4±1.8) and G5 (8.6±3.2). Analysis of the fracture pattern revealed a higher incidence of adhesive fractures for all experimental groups. Conclusion: The results indicate that Er,Cr:YSGG laser at the parameters used in this in vitro study did not enhance composite resin bonding to eroded dentin.
Highlights
Dental erosion is a chemical process characterized by the surface dissolution of dental hard tissues, as a result of the exposure to a variety of acids, without the involvement of microorganisms [1]
The lowest μSBS mean value was found for G4 (7.1 ± 1.5), which did not result in significant differences compared with G2 (7.5 ± 1.8), G3 (8.4 ± 1.8) and G5 (8.6 ± 3.2)
Sound dentin Eroded dentin Eroded dentin treated with Erbium lasers (Er),Cr:YSGG laser 1.5 W
Summary
Dental erosion is a chemical process characterized by the surface dissolution of dental hard tissues, as a result of the exposure to a variety of acids, without the involvement of microorganisms [1]. The erosive process involves enamel demineralization, which is characterized by initial softening and increased roughness of the surface [2]. As this process continues, there is progressive dissolution of the enamel crystals, leading to a permanent loss of tooth volume with a softened layer persisting at the surface of the remaining tissue [1]. In spite of the low cost and shorter time taken to perform this technique, it can cause pain, vibration and discomfort to the patient. This is why new technologies have advanced in dentistry [4]
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