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Table 5 Descriptive statistics of TAD positions

From: Temporary anchorage device usage: a survey among Swiss orthodontists

  Mean ± SD Median Percentiles Minimum Maximum
25th 75th
Palatal implants       
  x coordinates (mm) 0.5 ± 1.0 0.3 0.0 1.2 −3.2 2.4
  y coordinates (mm) 15.6 ± 3.0 15.2 14.0 17.0 10.2 25.6
Mini-screws       
  Patient's right side       
   x coordinates (mm) −6.5 ± 1.6 −6.9 −7.4 −5.6 −9.8 −3.4
   y coordinates (mm) 15.4 ± 3.8 14.4 12.9 17.4 9.3 22.7
  Centre       
   x coordinates (mm) 0.8 ± 1.3 1.0 −0.2 1.5 −1.5 3.3
   y coordinates (mm) 15.3 ± 2.6 14.6 13.0 17.7 11.9 19.0
  Patient's left side       
   x coordinates (mm) 7.0 ± 1.9 7.0 6.0 8.6 3.3 10.0
   y coordinates (mm) 15.5 ± 3.8 14.1 13.0 19.8 9.5 20.8
  1. The origin of coordinates as shown in Figure 5 is defined by the midline (raphe) and the incisal edges of the central incisors. Negative x coordinates are defined as left of midline on the picture, which corresponds to the patient's right side.