Reduction of COS
Within the 1-month trial, COS was reduced in all groups. The baseline depth of the COS before the intervention averaged 5.30±0.46 mm, 5.60 ± 0.92 mm, and 5.40±0.49 mm in groups 1, 2, and 3, respectively. After 1 month, COS was on average 4.40±0.49 mm, 4.70±0.91, and 4.70±0.46 in groups 1, 2, and 3, respectively (