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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effects of Ultramorphological Changes on Adhesion to Lased Dentin-Scanning Electron Microscopy and Transmission Electron Microscopy Analysis

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Author(s):
Moretto, Simone G. [1] ; Azambuja, Jr., Nilton [1] ; Arana-Chavez, Victor E. [2] ; Reis, Andre F. [3] ; Giannini, Marcelo [4] ; Eduardo, Carlos de P. [1] ; De Freitas, Patricia M. [1]
Total Authors: 7
Affiliation:
[1] Univ Sao Paulo, Dept Dent, Fac Odontol, Lab Especial Laser Odontol, BR-05508000 Sao Paulo - Brazil
[2] Univ Sao Paulo, Div Oral Biol, Dept Mat Dent, BR-05508000 Sao Paulo - Brazil
[3] Univ Guarulhos, Fac Odontol, Dept Dent, BR-07023070 Guarulhos, SP - Brazil
[4] Univ Estadual Campinas, Fac Odontol Piracicaba, Dept Dent, BR-13414903 Piracicaba, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: MICROSCOPY RESEARCH AND TECHNIQUE; v. 74, n. 8, p. 720-726, AUG 2011.
Web of Science Citations: 25
Abstract

Dentin irradiation with erbium lasers has been reported to alter the composite resin bond to this treated surface. There is still a lack of studies reporting the effect of erbium lasers on dentin organic content and elucidating how laser treatment could interfere in the quality of the resin-dentin interface. This study aimed to evaluate the effect of erbium laser irradiation on dentin morphology and microtensile bond strength (lTBS) of an adhesive to dentin. Seventy-two dentin disks were divided into nine groups (n = 8): G1-Control (600-grit SiC paper); Er:YAG groups: G2-250 mJ/4 Hz; G3-200 mJ/4 Hz; G4-180 mJ/10 Hz; G5-160 mJ/10 Hz; Er, Cr:YSGG groups: G6-2 W/20 Hz; G7-2.5 W/20 Hz; G8-3 W/20 Hz; G9-4 W/20 Hz. Specimens were processed for cross-sectional analysis by scanning electron microscopy (SEM) (n = 3), transmission electron microscopy (TEM) (n = 2), and adhesive interface (n = 3). Forty-five dentin samples (n = 5) were restored and submitted to lTBS testing. ANOVA (alpha = 5%) revealed that G1 presented the highest lTBS values and irradiated groups did not differ from each other. TEM micrographs showed a superficial layer of denatured collagen fibrils. For SEM micrographs, it was possible to verify the laser effects extending to dentin subsurface presenting a rough aspect. Cross-sectional dentin micrographs of this hybridized surface revealed a pattern of modified tags with ringlike structures around it. This in vitro study showed that erbium laser irradiation interacts with the dental hard tissue resulting in a specific morphological pattern of dentin and collagen fibrils that negatively affected the bond strength to composite resin. Microsc. Res. Tech. 74:720-726, 2011. (C) 2010 Wiley-Liss, Inc. (AU)

FAPESP's process: 07/06083-4 - Long-term evaluation of the bond strength, nanoleakage patterns and ultramorphological characteristics of resin-dentin interfaces produced by self-adhesive cements
Grantee:André Figueiredo Reis
Support Opportunities: Regular Research Grants