Surface Evaluation of Enamel Etched by Er,Cr:YSGG Laser for Orthodontic Purpose
| Autor: | Cláudia C. B. O. Mota, Patricia Aparecida Ana, Luciana Sa Melo, Daniela S. Lopes, Denise Maria Zezell, Anderson S. L. Gomes, Daisa L. Pereira |
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| Rok vydání: | 2020 |
| Předmět: |
Universal testing machine
Materials science Enamel paint Scanning electron microscope 030206 dentistry Laser law.invention Demineralization 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine chemistry Etching (microfabrication) law 030220 oncology & carcinogenesis visual_art visual_art.visual_art_medium Irradiation Composite material General Dentistry Phosphoric acid |
| Zdroj: | The Journal of Contemporary Dental Practice. 21:227-232 |
| ISSN: | 1526-3711 |
| DOI: | 10.5005/jp-journals-10024-2777 |
| Popis: | AIM To compare the effect of erbium, chromium:yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser at different irradiation parameters and acid etching on the shear bond strength (SBS) of orthodontic brackets to enamel. MATERIALS AND METHODS Forty bovine incisors were randomly distributed into groups (n = 10): GI: 37% phosphoric acid etching; GII: Er,Cr:YSGG laser etching 19.1 J/cm2; GIII: Er,Cr:YSGG, 29.3 J/cm2; and GIV: Er,Cr:YSGG, 42.4 J/cm2. After treatments, metallic brackets were bonded using Transbond XT adhesive system. After light curing, the samples were subjected to 500 thermal cycles, debonded with a universal testing machine, and the SBS values were recorded. After debonding, surface morphology was evaluated using scanning electron microscopy (SEM) and optical coherence tomography (OCT). The values of SBS testing were analyzed by one-way analysis of variance (ANOVA) and Tukey post hoc test, at 5% significance level. RESULTS The mean SBS values of GI, GII, GIII, and GIV groups were 6.2 ± 1.7 MPa, 4.6 ± 2.5 MPa, 7.0 ± 2.2 MPa, and 8.0 ± 3.6 MPa, respectively. Laser irradiation promoted rough surfaces in all parameters used, and the OCT analysis revealed higher optical changes on lased groups when compared with phosphoric acid. CONCLUSION Er,Cr:YSGG laser irradiation operated at 42.4 J/cm2 and 29.3 J/cm2 is a better alternative for etching enamel prior to the orthodontic treatment than the phosphoric acid. CLINICAL SIGNIFICANCE Er,Cr:YSGG laser irradiation is better than the phosphoric acid for etching enamel prior to the orthodontic treatment because laser irradiation promotes similar SBSs and preventing demineralization around orthodontic brackets. |
| Databáze: | OpenAIRE |
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