Análise do cimento modificado com clorexidina em pacientes ortodônticos: um ensaio duplo-cego, randomizado e controlado

Abstract

Background: The aim of this study was to evaluate the microbiological and mechanical properties of GIC modified by chlorhexidine (CLX) for the purpose of cementing bands to the teeth of orthodontic patients. Material and Methods: Ten patients, between the ages of 19-33 years, in the initial stage of orthodontic treatment, were randomly and designated to two groups using the split-mouth design(n=10), one Group (GICEX) had bands cemented with GIC modified by CLX and a Control Group(GIC), evaluated at time intervals before(T0), 3 months(T3) and 6 months(T6) after cementation. Total microbiological counts were performed, and color stability of tooth enamel, salivary pH, and the adhesive remnant index (ARI) were evaluated. The Friedman and Dunn tests, Mann-Whitney, one-way ANOVA and Tukey, and paired- and non-paired T tests(P<0.05) were used. Results: In T3, there was evidence of significant reduction in the quantity of CFU in Group GICEX in comparison with the Control(P=0.041). In T6, the quantity of CFU was similar to the quantity in T3 and significantly different to control (P=0.045); Group Control demonstrated a similar quantity of CFU between the experimental time intervals (P=0.066). Salivary pH demonstrated significant difference only between the time intervals T0 and T6(P=0.022). The tooth enamel color(P=0.366) and ARI(P=0.343) values demonstrated no significant changes. Conclusion: The incorporation of CLX into GIC demonstrated effective antibacterial action, allowed a good bond of the cement to the enamel, a high rate of survival of the bands; did not change the color of the tooth enamel, and maintained the salivary pH at physiological levels.