Comparison of plaque index (PI), calculus index (CI), gingival index (GI) and bleeding on probing (BOP) between two groups of retainers.
p-values calculated using Mann-Whitney test. Group 1 = FRC. Group 2 = MSW. T0 = baseline. T1 = 3 months after insertion. T2 = 6 months after insertion. T3 = 9 months after insertion. T4 = 12 months after insertion.