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Table 2 Proportion of apical protrusion of the maxillary molars

From: Investigating the anatomical relationship between the maxillary molars and the sinus floor in a Chinese population using cone-beam computed tomography

tooth position

MBR

DBR

PR

Whole tooth

16

26 (13%)

17 (8.5%)

31 (15.5%)

47 (23.5%)

17

32 (16%)

25 (12.5%)

10 (5%)

50 (25%)

26

16 (8%)

17 (8.5%)

27 (13.5%)

41 (20.5%)

27

41 (20.5%)

31 (15.5%)

14 (7%)

62 (31%)

  1. Tooth position 16 represents the right first molar, 17 represents the right second molar, 26 represents left first molar, and 27 represents left second molar
  2. MBR, mesiobuccal root; DBR, distobuccal root, PR: the palatal root. Whole tooth, at least one root protruded into the maxillary sinus