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Table 4 Comparison of protraction effectiveness following averaging of values for left- and right-sided protractions in those subjects who received a bilateral molar protraction

From: Comparison of anchorage reinforcement with temporary anchorage devices or a Herbst appliance during lingual orthodontic protraction of mandibular molars without maxillary counterbalance extraction

  Valid subjects (N) Mean mm/month SD Minimum Maximum Median
Herbst 15 0.53 0.19 0.19 0.89 0.46
TAD 12 0.36 0.15 0.18 0.63 0.34
All Groups 27 0.45 0.19 0.18 0.89 0.34
  1. There was a significant difference between both methods in terms of duration of protraction (unpaired t-test, p = 0.013)