Table 3 Site furcation level mean (± SEM) recordings for the clinical parameters and gingival crevicular fluid volume at baseline, and at 6 and 12 months and mean change (Δ) from baseline and 6 months

PD

 Test

4.8 ± 0.4

4.0 ± 0.4

3.7 ± 0.4

− 0.9 ± 0.2

< 0.001

− 0.2 ± 0.2

0.331

− 1.0 ± 0.2

< 0.001

 Control

4.6 ± 0.2

3.5 ± 0.3

3.4 ± 0.3

− 1.05 ± 0.2

< 0.001

− 0.1 ± 0.2

0.534

− 1.2 ± 0.3

< 0.001

 Difference

0.2 ± 0.3

0.468

0.5 ± 0.4

0.192

0.4 ± 0.4

0.232

0.20 ± 0.3

0.454

− 0.0 ± 0.3

0.901

0.2 ± 0.3

0.540

CAL

 Test

5.5 ± 0.4

5.2 ± 0.4

5.1 ± 0.4

− 0.3 ± 0.2

0.175

− 0.1 ± 0.2

0.502

− 0.4 ± 0.3

0.119

 Control

5.0 ± 0.2

4.4 ± 0.3

4.5 ± 0.3

− 0.6 ± 0.1

< 0.001

0.1 ± 0.1

0.584

− 0.5 ± 0.2

0.004

 Difference

0.5 ± 0.4

0.221

0.8 ± 0.4

0.032

0.6 ± 0.4

0.097

0.3 ± 0.2

0.107

− 0.2 ± 0.2

0.404

0.2 ± 0.2

0.448

GCF

 Test

79.5 ± 7.5

57.3 ± 7.5

44.0 ± 7.7

− 22.2 ± 11.0

0.044

− 14.6 ± 11.2

0.171

− 36.7 ± 11.2

0.001

 Control

78.8 ± 7.5

55.1 ± 7.5

45.0 ± 7.7

− 23.7 ± 7.6

0.002

− 10.6 ± 7.7

0.171

− 34.2 ± 7.7

< 0.001

 Difference

0.7 ± 8.8

0.937

2.2 ± 8.8

0.804

− 1.0 ± 9.1

0.917

− 1.5 ± 12.5

0.905

3.2 ± 12.7

0.804

1.7 ± 12.7

0.897