We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Microtensile bond strength of resin composite to dentin treated with Er:YAG laser of bleached teeth.
- Authors
Leonetti, Eduardo dos; Rodrigues, José; Reis, André; Navarro, Ricardo; Aranha, Ana; Cassoni, Alessandra
- Abstract
The objective of this study was to evaluate the influence of Er:YAG laser (λ = 2.94 μm) on microtensile bond strength (μTBS) and superficial morphology of bovine dentin bleached with 16% carbamide peroxide. Forty bovine teeth blocks (7 × 3 × 3 mm) were randomly assigned to four groups: G1- bleaching and Er:YAG irradiation with energy density of 25.56 J/cm (focused mode); G2 - bleaching; G3 - no-bleaching and Er:YAG irradiation (25.56 J/cm); G4 - control, non-treated. G1 and G2 were bleached with 16% carbamide peroxide for 6 h during 21 days. Afterwards, all blocks were abraded with 320 to 600-grit abrasive papers to obtain flat standardized dentin surfaces. G1 and G3 were Er:YAG irradiated. Blocks were immediately restored with 4-mm-high composite resin (Adper Single Bond 2, Z-250-3 M/ESPE). After 24 h, the restored blocks ( n = 9) were serially sectioned and trimmed to an hour-glass shape of approximately 1 mm at the bonded interface area, and tested in tension in a universal testing machine (1 mm/ min). Failure mode was determined at a magnification of 100× using a stereomicroscope. One block of each group was selected for scanning electron microscope (SEM) analysis. μTBS data was analyzed by two-way ANOVA and Tukey test (α = 0.05). Mean bond strengths (SD) in MPa were: G1- 32.7 (5.9); G2- 31.1 (6.3); G3- 25.2 (8.3); G4- 36.7 (9.9). Groups with different uppercase letters were significantly different from each other ( p < .05). Enamel bleaching procedure did not affect μTBS values for dentin adhesion. Er:YAG laser irradiation with 25.56 J/cm prior to adhesive procedure of bleached teeth did not affect μTBS at dentin and promoted a dentin surface with no smear layer and opened dentin tubules observed under SEM. On the other hand, Er:YAG laser irradiation prior to adhesive procedure of non-bleached surface impaired μTBS compared to the control group.
- Subjects
DENTIN abnormalities; DENTAL resins; LASER endoscopy; DENTAL materials; SCANNING electron microscopy; COMPOSITE materials; DENTAL enamel; CONTROL groups; THERAPEUTICS
- Publication
Lasers in Medical Science, 2012, Vol 27, Issue 1, p31
- ISSN
0268-8921
- Publication type
Article
- DOI
10.1007/s10103-010-0838-1