Table 1 Characteristics of the sample

Demographic data

 female/male

37/8

40/6

0.57

 age

23.44 ± 3.0 [19, 33]

22.60 ± 2.2 [18, 28]

0.14

Dental status (without 3rd molars)

 Decayed teeth (0/1–2/≥3)

36/8/1

38/8/0

0.89

 Missing teeth (0/1–2/≥3)

38/5/2

44/2/0

0.15

 Filled teeth (0/1–5/6–9/≥10)

14/20/8/3

16/21/8/1

0.83

 DMFT

3.82 ± 3.73 [0, 13]

2.63 ± 2.90 [0, 10]

0.17

Periodontal status (including 3rd molars)

 PBI mean

0.69 ± 0.38 [0.1, 1.6]

0.70 ± 0.40 [0.1, 2.1]

0.87

 PBI % bleeding full mouth

42.68 ± 19.31 [4.5, 78.6]

41.50 ± 19.0 [7.1, 89,3]

0.77

 PBI % bleeding outer surfaces

33.44 ± 22.70 [0.0, 82.1]

29.47 ± 20.36 [0.0, 85.7]

0.38

 PBI % bleeding inner surfaces

51.91 ± 20.93 [9.1, 89.3]

53.54 ± 23.00 [14.3, 92.9]

0.73

 Overall PSI (0/1/2/3/4)

2/6/24/13/0

0/6/32/7/1

0.20

Plaque before tooth brushing

 MPI overall

75.87 ± 15.29 [32.1, 99.1]

74.72 ± 14.03 [33.9, 98.2]

0.71

 MPI outer surfaces

66.93 ± 20.49 [17.0, 100.0]

64.21 ± 17.39 [22.3, 97.3]

0.50

 MPI inner surfaces

84.81 ± 14.24 [27.7, 100.0]

85.23 ± 14.68 [45.5, 100.0]

0.89

 MPI at cervical sites

63.15 ± 20.28 [0.9, 98.2]

61.01 ± 19.02 [16.1, 96.4]

0.61

 MPI at proximal sites

88.60 ± 11.60 [55.4, 100.0]

88.43 ± 11.18 [45.5, 100.0]

0.94

 TQHI % 3–5 overall

46.39 ± 23.40 [1.8, 87.5]

41.69 ± 21.66 [3.6, 87.50]

0.32

 TQHI % 3–5 outer surfaces

51.32 ± 28.66 [0.0, 96.4]

44.25 ± 25.24 [3.6, 92.9]

0.22

 TQHI % 3–5 inner surfaces

41.45 ± 21.89 [0.0, 82.1]

39.14 ± 24.94[0.0, 85.7]

0.64