Fig. 3From: Clinical research: low-level laser therapy in accelerating orthodontic tooth movementChanges in cytokine levels in the gingival crevicular fluid (GCF) throughout the study period. GCF concentrations of a IL-1β, b OPG, and c RANKL, and d the RANKL/OPG ratio are shown for control and laser groups. *P < 0.05 was considered significant, based on the Paired t test (for intergroup comparisons) or one-way ANOVA (for comparisons to baseline)Back to article page