Table 2 Clinical variables (mean ± SD) of the test group (subgingival instrumentation + subgingival erythritol air-polishing) and control group (subgingival instrumentation alone) at baseline (T1) as well as three (T2) and six months (T3) after subgingival instrumentation incl. statistics

3.14 ± 0.39

2.44 ± 0.42***

2.23 ± 0.25***

3.08 ± 0.36

2.46 ± 0.35***

2.30 ± 0.26***

3.50 ± 0.45

2.94 ± 0.50***

2.85 ± 0.42***

3.52 ± 0.44

3.05 ± 0.44***

3.02 ± 0.45**

28.8 ± 31.6

13.5 ± 7.5**

11.5 ± 4.6**

27.9 ± 16.5

13.9 ± 9.6***

12.0 ± 9.2***

29.88 ± 15.27

4.16 ± 7.68***

0.64 ± 1.38***

27.62 ± 6.54

6.54 ± 8.37***

3.12 ± 4.02***^¶¶

16.9 ± 9.7

15.9 ± 17.7

16.4 ± 14.4

24.3 ± 20.7

19.7 ± 20.7

14.8 ± 9.6*