Revista de Odontologia da UNESP
https://revodontolunesp.com.br/article/doi/10.1590/1807-2577.10219
Revista de Odontologia da UNESP
Original Article

Influence of hydrofluoric acid etching time and concentration on shear bond strength of metal brackets to ceramic surfaces

Influência do tempo e concentração do ácido fluorídrico na resistência de união do braquete metálico à superfície cerâmica

Cedirlei Gomes da Silveira ANDRADE; Diego Patrik Alves CARNEIRO; Mariana NABARRETTE; Américo Bortolazzo CORRER; Heloisa Cristina VALDRIGHI

http://dx.doi.org/10.1590/1807-2577.10219 Rev. odontol. UNESP, vol.48, e20190102, 2019
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Abstract

Abstract: Introduction: Surface treatment prior to bonding ceramic brackets with hydrofluoric acid is indicated because of its ability to promote morphological changes necessary for adhesion.

Objective: To evaluate the shear bond strength (RUC) of metal brackets bonded to the feldspar ceramic surface under the action of hydrofluoric acid (AF), in different concentrations (5% and 10%) and different application times (30 and 60 seconds).

Material and method: Four nickel-chrome metal blocks that received an application of feldspathic ceramic were used, to which 80 metal brackets (Abzil/3M) were bonded and divided into 4 Groups (n=20) according to the acid etching procedure. The blocks were etched with 5% hydrofluoric acid for 30 and 60 seconds (AF5/30 and AF5/60, respectively) and 10% hydrofluoric acid for 30 and 60 seconds (AF10/30, AF10/60, respectively). The resin composite used was Transbond XT (3M) and the presence of a glazer was maintained on the ceramic surface. The specimens were placed on a Universal test machine Instron 4411 (Instron Corp, USA) to which a chisel was adapted to perform the shear test at a speed of 1mm/min. The data were submitted to the analysis of variance (ANOVA) and the Adhesive Remnant Index was evaluated.

Result: In the time interval of 30 seconds, there was no significant difference for the 5% and 10% hydrofluoric acid concentrations. In the 60-second time interval, the 10% concentration showed significantly higher shear bond strength values (p<0.05). The ARI showed predominance of scores 1 and 2.

Conclusion: It was concluded that 10% hydrofluoric acid showed higher shear bond strength values in 60 seconds of etching, while 5% hydrofluoric acid showed no significant difference between the etching times.

Keywords

Acid etching, ceramic, shear bond strength, orthodontic bracket

Resumo

Resumo: Introdução: O tratamento de superfície prévio a colagem de braquetes a cerâmica com ácido fluorídrico, é indicado devido a sua capacidade de promover alterações morfológicas necessárias para a adesão.

Objetivo: Avaliar a resistência de união ao cisalhamento (RUC) de braquetes metálicos unidos à superfície cerâmica feldspática sob a ação do ácido fluorídrico (AF), em diferentes concentrações (5% e 10%) e tempos de aplicação distintos (30 e 60 segundos).

Material e método: Foram utilizados quatro blocos metálicos em níquel-cromo, que receberam a aplicação de cerâmica feldspática, onde foram colados 80 braquetes metálicos (Abzil/3M), divididos em 4 grupos conforme o condicionamento ácido (n=20). Foram condicionados com ácido fluorídrico 5%, por 30 e 60 segundos (AF5/30 e AF5/60) e ácido fluorídrico 10%, por 30 e 60 segundos (AF10/30, AF10/60). O compósito resinoso utilizado foi o Transbond XT (3M) e na superfície cerâmica foi mantido a presença do glazer. Os espécimes foram posicionados na máquina de ensaio universal Instron 4411 (Instron Corp, EUA) com um cinzel adaptado, para teste de cisalhamento, com velocidade de 1mm/min. Os dados foram submetidos a análise de variância (ANOVA) e o Índice de Remanescente Adesivo (IRA) foi avaliado.

Resultado: No tempo de 30 segundos não ocorreu diferença significativa para as concentrações de 5% e 10% do ácido fluorídrico. No tempo de 60 segundos, para a concentração de 10% houve uma força de cisalhamento significativamente maior (p<0,05). O IRA apresentou predominância dos escores 1 e 2.

Conclusão: Concluiu-se que o ácido fluorídrico 10% apresentou os maiores valores de resistência de união ao cisalhamento em 60 segundos de condicionamento, enquanto, o ácido fluorídrico 5% não demonstrou diferença significativa entre os tempos.
 

Palavras-chave

Condicionamento ácido, cerâmica, resistência ao cisalhamento, braquete ortodôntico

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