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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