Table 6 Tooth brushing performance of 12- and 18-year olds

Tooth contact time (seconds)

199.8 (80.5)

206.7 (84.0)

 Inner surfaces

32.3 (30.8); 27.6 (6.0, 49.5)

30.6 (30.9); 21.3 (5.0, 47.6)

 Outer surfaces

85.5 (46.0)

91.3 (40.7)

 Occlusal surfaces

82.1 (42.5)

84.8 (46.0)

% of tooth contact time

 Inner surfaces

15.2 (12.2); 14.2 (3.7, 23.7)

13.3 (10.3); 12.9 (3.7, 21.6)

 Outer surfaces

43.2 (15.1)

46.1 (16.5)

 Occlusal surfaces

41.6 (15.3)

40.6 (15.3)

% of movements on inner surfaces^a

 Circular^b

1.0 (6.9); 0.0 (0.0, 0.0)

6.9 (16.3); 0.0 (0.0, 4.9)

 Horizontal

37.2 (38.8); 20.0 (0.0, 76.0)

52.2 (30.5); 57.3 (27.1, 76.1)

 Vertical

58.9 (39.0); 74.0 (20.6, 97.1)

40.7 (30.7); 37.9 (16.3, 59.5)

 No movements^c

2.8 (9.6); 0.0 (0.0, 1.8)

N/A

% of movements on outer surfaces

 Circular

50.9 (32.4); 56.0 (23.7, 79.6)

59.5 (34.0); 70.4 (33.7, 90.4)

 Horizontal

38.8 (30.4); 33.6 (12.5, 60.5)

35.4 (33.2); 26.1 (5.0, 62.3)

 Vertical^d

8.3 (14.7); 2.9 (0.5, 9.2)

4.7 (12.2); 0.0 (0.0, 2.1)

 No movements^c

1.9 (2.2); 1.3 (0.0, 3.1)

N/A