Revista de Odontologia da UNESP
https://revodontolunesp.com.br/article/doi/10.1590/1807-2577.05318
Revista de Odontologia da UNESP
Original Article

Evaluation of friction in metal, ceramic and self-ligating brackets submitted to sliding mechanics

Avaliação do atrito em braquetes metálicos, cerâmicos e autoligados submetidos à mecânica de deslizamento

Aryadne Cipreste MASCARELO; Ana Paula GODOI; Vivian FURLETTI; William CUSTÓDIO; Heloisa Cristina VALDRIGHI

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Abstract

Abstract: Objective: With the purpose of evaluating the best results for a proposed orthodontic treatment, the aim of this research was to verify the frictional force between archwires and orthodontic brackets in sliding mechanics.

Material and method: Three different types of brackets were used: conventional metal, self-ligating metal and conventional polycrystalline esthetic type (n=10), totaling 30 brackets and .019 x .025 inches stainless steel rectangular wire. An acrylic plate was used. The wire was fixed to the brackets (conventional metal and conventional polycrystalline esthetic) with esthetic elastomeric ligation. The acrylic plate together with the 019 x 0.025 inches wire fitted to it was attached to the base plate of the Instron 4411 universal test machine so that it was positioned perpendicular to the ground. The bracket was drawn through the archwire segment at a speed of 5 mm / minute for a distance of 5 mm. For each type of bracket, ten tests were performed, with the bracket and archwire set being changed for each repetition. Data were analyzed by one-way Analysis of Variance (p <0.0001) and the Tukey Test (p <0.05).

Result: Convencional metal and self-ligating brackets presented similar friction (p>0.05), while ceramic bracket presented higher frictional resistance during sliding test (p<0.05).

Conclusion: It was concluded that the type of bracket influenced the frictional force value obtained, and better results were found when the metal and self-ligating brackets were used. The ceramic bracket presented a higher frictional force value.

Keywords

Dental friction, orthodontic wires, orthodontic brackets

Resumo

Resumo: Objetivo: Visando avaliar os melhores resultados para um tratamento ortodôntico de premissa, esta pesquisa teve como objetivo verificar a força de atrito entre fio e braquetes ortodônticos na mecânica de deslizamento.

Material e método: Foram utilizados três diferentes tipos de braquetes, sendo metálico convencional, metálico autoligado e estético policristalino convencional (n=10), totalizando 30 braquetes e fio retangular de aço inoxidável .019 x .025 polegadas. Foi utilizada uma placa de acrílico. O fio foi fixado aos braquetes (metálico convencional e estético policristalino convencional) com ligadura elastomérica estética. A placa de acrílico juntamente com o fio .019 x .025 polegadas montado foi fixada ao mordente da base da máquina de ensaio universal Instron 4411, de maneira que ficou posicionada perpendicular em relação ao solo. O braquete foi tracionado à velocidade de 5 mm/minuto através do segmento do fio por uma distância de 5mm. Para cada tipo de braquete foi realizado dez testes havendo a troca do conjunto braquete e fio em cada repetição. Os dados foram analisados por Análise de Variância um fator (p<0,0001) e Teste de Tukey (p<0,05).

Resultado: Braquetes metálicos convencionais e autoligáveis apresentaram atrito similar (p>0,05), enquanto braquetes cerâmicos apresentaram maior resistência ao atrito durante o teste de deslizamento (p<0,05).

Conclusão: Conclui-se que o tipo de braquete influenciou no valor de atrito obtido, sendo que melhores resultados foram encontrados quando foram utilizados os braquetes metálicos e autoligados. O braquete cerâmico apresentou maior atrito.
 

Palavras-chave

Atrito dentário, fios ortodôntico, braquetes ortodônticos

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