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Um fator importante que define a eficácia dos aparelhos ortodônticos fixos é o atrito existente entre as superfícies de fios e braquetes. Assim, este estudo teve como objetivo investigar o coeficiente de atrito estático entre fios de aço inoxidável e beta-titânio (TP Orthodontics) e braquetes de aço inoxidável (Dynalock&#174; - Unitek), braquetes estéticos com slot de aço inoxidável (Clarity&#174; - Unitek) e estéticos convencionais (Allure&#174; - GAC). Para tanto, construiu-se um equipamento no Departamento de Engenharia Mecânica e Mecatrônica da PUCRS. Antes de serem iniciados os testes, foi quantificado o erro de método e constatou-se que não houve interferência significante (p>0,05) do fator operador nas medições. Então, pôde-se calcular o valor do coeficiente de atrito, obtido pela divisão da força de atrito pela carga normal. O método estatístico utilizado neste estudo foi Análise de Variância (ANOVA) e teste de Comparações Múltiplas (Tukey). Constatou-se que: 1) a combinação com menor coeficiente de atrito foi composta pelo fio de aço inoxidável e braquete Dynalock&#174; e a que apresentou maior coeficiente foi a do braquete Allure&#174; com o fio de beta-titânio; 2) o fio de beta-titânio apresentou coeficiente de atrito significativamente maior do que o fio de aço inoxidável; 3) o braquete Dynalock&#174; não apresentou diferenças significativas em relação ao coeficiente de atrito do braquete Clarity&#174; quando o fio utilizado foi de beta-titânio. No entanto, quando o fio testado foi de aço inoxidável, apresentou coeficiente de atrito significativamente menor. O braquete Clarity&#174; apresentou coeficiente de atrito significativamente menor do que o braquete Allure&#174;. An important factor that defines the effectiveness of the appliances is the friction between the surfaces of wires and brackets. Thus, that study was developed in order to investigate the static friction coefficient between stainless steel and beta-titanium wires (TP Orthodontics) and the stainless steel brackets (Dynalock&#174; - Unitek), esthetic brackets with a stainless steel slot (Clarity&#174; - Unitek) and conventional esthetic brackets (Allure&#174; - GAC). For this purpose, an equipment was built in the Department of Mechanical Engineering and Mechatronics at PUCRS. It should be stressed that before the tests began, the Method Error was quantified and it was found that there was no significant interference (p>0,05) by the factor operating in the measurements. From then, the friction coefficient could be calculated, obtained by dividing friction force by the normal load. The statistic method used in these study was Analysis of Variance (ANOVA) and Multiple Comparison test (Tukey). It was found that: 1) the combination with the lowest friction coefficient was constituted by the stainless steel wire against the Dynalock&#174; bracket, and the one with the highest friction coefficient was that of the Allure&#174; bracket with the beta-titanium wire; 2) the beta-titanium wire presented a friction coefficient that was significantly higher than the stainless steel wire; 3) the Dynalock&#174; bracket did not present any significant differences in relation to the friction coefficient of the Clarity&#174; bracket when the wire used was of beta-titanium. However, when the wire tested was of stainless steel, the Dynalock&#174; bracket presented a significantly lower friction coefficient. The Clarity&#174; bracket presented a significantly lower friction coefficient than the Allure&#174; bracket

Avaliação do coeficiente de atrito de braquetes metálicos e estéticos com fios de aço inoxidável e beta-titânio