In the test group ( with tension ) the initial mean recession depth was 2.82 + / - 0.64 mm and mean FTens was 6.5 g , while in the control group ( without tension ) the initial mean recession depth was 2.68 + / - 0.81 mm and mean FTens was 0.4 g. Three months later , the test group showed a mean recession reduction of 2.18 + / - 0.60 mm , a mean percent root coverage of 78 + / - 15 % , and complete root coverage was achieved on 2 teeth ( 18 % ) .
