highly significantP < 0.001
The mean PD reductions from baseline to 3 and 6 months were found to be 1.74 ± 0.14 mm and 1.93 ± 0.26 mm, respectively, for control group, which was highly significant ( P < 0.001); and 1.93 ± 0.33 mm and 2.03 ± 0.31 mm, respectively, for test group, which was highly significant ( P < 0.001).