Table 2 Comparison of periodontal clinical indexes among the four groups (\( \overline{x} \) ±s)

Combined group (n=18)

Before therapy

2.49±0.63

0.96±0.12

5.66±0.59

5.78±1.72

After 3 months of therapy

0.41±0.06

0.32±0.08

3.01±0.19

3.28±0.28

Root planing group (n=18)

Before therapy

2.38±0.71

0.99±0.16

5.62±0.37

5.68±1.01

After 3 months of therapy

0.54±0.02

0.46±0.09

3.42±0.15

3.49±0.32

Periodontal curettage group (n=18)

Before therapy

2.45±0.59

0.92±0.14

5.61±0.37

5.82±1.39

After 3 months of therapy

0.52±0.07

0.47±0.10

3.40±0.16

3.51±0.33

Cleansing group (n=18)

Before therapy

2.51±0.63

0.98±0.17

5.71±0.37

5.87±1.28

After 3 months of therapy

0.64±0.06

0.54±0.07

3.76±0.34

3.65±0.53

t

0.144

0.78

0.177

0.062

P

0.933

0.509

0.912

0.98

t’

176.034

20.796

33.883

2.939

P′

<0.001

<0.001

<0.001

0.039