highly significantP < 0.001
Despite the fact that in the total population the decrease in the angulation between the mandibular plane and the axis of the mandibular central incisors was highly significant (mean = −10.24°, P < 0.001), an increase in alveolar height, expressed as the distance from the “D” point to the alveolar crest, was not evident in 42.4% of the cases.