Comparative long term post-treatment changes in hyperdivergent Class II Division 1 patients with early cervical traction treatment.

This was a retrospective study of 45 Class II Division I hyperdivergent patients treated in the mixed dentition with cervical traction and an incisor biteplane. The interjaw or "B" angle (mandibular plane to palatal plane angle) was used to determine hyperdivergency. The treated sample was subdivided into 2 groups reflecting whether the mandibular or palatal plane contributed the greatest amount to the more than 1 standard deviation of the "B" angle from the mean value of the "B" angle present in the 89 untreated Class I controls.