Revista de Odontologia da UNESP
Revista de Odontologia da UNESP
Original Article

Evaluation of friction produced by self-ligating, conventional and Barbosa Versatile brackets

Avaliação do atrito produzido por bráquetes autoligados, convencionais e Barbosa Versátil

Barbosa, Jurandir Antonio; Elias, Carlos Nelson; Basting, Roberta Tarkany

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Introduction: The Barbosa Versatile bracket design may provide lower frictional force and greater sliding. However, no in vitro studies have shown its sliding mechanisms and frictional resistance, particularly in comparison with other self-ligating or conventional brackets. Objective: To compare the frictional resistance among self-ligating brackets (EasyClip/ Aditek, Damon MX/ Ormco and In Ovation R/ GAC); conventional brackets (Balance Roth/ GAC, and Roth Monobloc/ Morelli); and Barbosa Versatile bracket (Barbosa Versatile/ GAC) with different angles and arch wires. Material and method: Brackets were tested with the 0.014”, 0.018”, 0.019”×0.025” and 0.021”×0.025” stainless steel wires, with 0, 5, 10, 15 and 20 degree angulations. Tying was performed with elastomeric ligature for conventional and Barbosa Versatile brackets, or with a built-in clip system of the self-ligating brackets. A universal testing machine was used to obtain sliding strength and friction value readouts between brackets and wires. Result: Three-way factorial ANOVA 4×5×6 (brackets × angulation × wire) and Tukey tests showed statistically significant differences for all factors and all interactions (p<0.0001). Static frictional resistance showed a lower rate for Barbosa Versatile bracket and higher rates for Roth Monobloc and Balance brackets. Conclusion: The lowest frictional resistance was obtained with the Barbosa Versatile bracket and self-ligating brackets in comparison with the conventional type. Increasing the diameter of the wires increased the frictional resistance. Smaller angles produced less frictional resistance.


Friction, orthodontic wires, orthodontic brackets.


Introdução: O bráquete Barbosa Versátil apresenta um desenho que pode promover menor resistência friccional e maior deslize. No entanto, nenhum estudo in vitro avaliou seu mecanismo de deslize e resistência ao atrito, mesmo quando comparado com outros bráquetes autoligados ou convencionais. Objetivo: Comparar a resistência ao atrito entre bráquetes autoligados (EasyClip/ Aditek, Damon MX/ Ormco e In Ovation R/ GAC), convencionais (Balance Roth/ GAC, and Roth Monobloco/ Morelli) e o bráquete Barbosa Versátil (Barbosa Versatile/ GAC) com diferentes angulações e fios. Material e método: Os bráquetes foram avaliados com fios de aço inox 0.014”, 0.018”, 0.019”×0.025” e 0.021”×0.025”, com angulações de 0, 5, 10, 15 e 20 graus. Amarrias foram realizadas com ligaduras elastoméricas para os bráquetes convencionais e para o Barbosa Versátil, enquanto que se utilizou o sistema de fechamento próprio para os bráquetes autoligados. A máquina de teste universal foi utilizada para as avaliações de resistência ao atrito entre os bráquetes e fios. Resultado: ANOVA em esquema fatorial 4 × 5 × 6 (bráquetes × angulação × fios) e o teste de Tukey mostraram que houve diferenças significativas para todos os fatores e interações (p<0,0001). Houve menor resistência ao atrito para o bráquete Barbosa Versátil e maior para os bráquetes Roth Monobloco e Balance. Conclusão: Menor resistência ao atrito foi obtida com o bráquete Barbosa Versátil e com os autoligados em comparação com os bráquetes convencionais. O aumento do diâmetro dos fios aumenta a resistência ao atrito. Menores angulações promovem menor resistência ao atrito.


Fricção, fios ortodônticos, bráquetes ortodônticos.


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