Fig. 2
From: Effect of fixed orthodontic appliances on gingival status and oral microbiota: a pilot study
Differences in the plaque (A) and gingival (B) indices between two time-points – T0 (before bonding of fixed orthodontic appliances) and T1 (by or before the end of the 7th month after bonding of fixed orthodontic appliances) in 30 patients. Full circle, patient with deterioration of clinical index; empty circle, patient with unchanged or improved clinical index; p-value: statistical significance was calculated using the Wilcoxon matched-pairs signed-rank test