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Table 1 Buccolingual bone thickness and inter-radicular distance at various heights from the alveolar crest between the maxillary second premolar and first molar

From: Optimal sites for orthodontic anchor screw placement using panoramic images: risk of maxillary sinus perforation and contact with adjacent tooth roots during screw placement

 

N

Height from alveolar crest

5 mm

6.5 mm

8 mm

Bone thickness (mm)

 Sawtooth-like depression

6

4.0 ± 2.6

1.9 ± 1.1

1.6 ± 0.5

 Funnel-like depression

25

11.3 ± 1.9

10.8 ± 3.2

8.8 ± 4.4

 Non-depression

19

12.2 ± 1.4

12.2 ± 1.4

12.5 ± 1.3

Inter-radicular distance (mm)

 Sawtooth-like depression

6

4.2 ± 0.6

4.5 ± 0.7

5.3 ± 0.9

 Funnel-like depression

25

2.7 ± 0.6

3.0 ± 0.7

3.6 ± 0.9

 Non-depression

19

2.9 ± 0.8

3.1 ± 0.8

3.6 ± 0.9

  1. Values are shown as the mean ± standard deviation