Comparison of feldspathic veneer surface treatments on ceramic bracket SBS, ARI and surface roughness after different debonding/polishing methods: An in vitro study.

Autor: Leão CS; Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Brazil., Castro ACR; Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Brazil., Copello FM; Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Brazil. Electronic address: flavio.copello@yahoo.com.br., Elias CN; Instituto Military de Unguentaria, Rio de Janeiro, Brazil., Sekito Junior T; Department of Prosthesis and Dental Materials, Federal University of Rio de Janeiro, Brazil., Sant'Anna EF; Department of Pediatric Dentistry and Orthodontics, Federal University of Rio de Janeiro, Brazil. Electronic address: eduardo.franzotti@gmail.com.
Jazyk: angličtina
Zdroj: International orthodontics [Int Orthod] 2021 Dec; Vol. 19 (4), pp. 679-684. Date of Electronic Publication: 2021 Oct 06.
DOI: 10.1016/j.ortho.2021.08.006
Abstrakt: Objectives: To analyse, in vitro, surface properties and the shear bond strength after debonding and polishing procedures of ceramic brackets directly bonded to 0.3-0.5-mm thick feldspathic veneers.
Materials and Methods: Fifty six feldspathic ceramic veneers samples (0.3 to 0.5-mm thick) were allocated into groups according to veneers surface treatment procedures: (S) glaze layer was retained; (SHF) hydrofluoric (HF) acid etch; (SOXA) Al2O3 sandblasting; and (SB) diamond burs roughening. Specimens were treated with silane Monobond N® and ceramic brackets bonded with Transbond XT ®. Shear bonding strength (SBS) was assessed with a universal testing machine and ARI evaluated under a stereomicroscopic coupled to a digital camera. Remaining bonding composite was removed using a porcelain polishing kit and surface roughness assessed with a stylus profilometer.
Results: No statistically significant differences were identified for SBS among the study groups (S, SHF, SOXA and SB) (P>0.05). The majority of the specimens presented ARI scores 3 and 2 (P>0.05). All of the study groups presented increased surface roughness after debonding and polishing procedures (P<0.05), with significant greater values observed in SB group (RaF: 1.27±0.41; RzF: 6.23±1.82), (P<0.05).
Conclusions: Surface treatment with hydrofluoric acid etch, Al 2 O 3 sandblasting and diamond bur did not enhance SBS of orthodontic brackets bonded to ceramic veneers. Ceramic surfaces treated with diamond burs presented significantly increased roughness after adhesive removal.
(Copyright © 2021. Published by Elsevier Masson SAS.)
Databáze: MEDLINE
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