Research Article
Naveen Shamnur, Mandava Prasad
Abstract
The objective of the study is to evaluate treatment effects of orthopedic facemask on Class III preadolescents depending on the vertical facial pattern. This study was based on 30 patients aged 9–12 years, and were diagnosed as skeletal Class III with maxillary deficiency. They were divided into 2 groups (low and high angle groups) depending on gonial angle and the SNMP (GoGn) angle, respectively. Pretreatment and post-treatment lateral cephalograms were used to compare the effects of facemask and the following conclusions were obtained:1) A significantly large amount of backward movement of the point B was observed in patients with a low SNMP angle. Those with a high SNMP angle had significant forward movement at point A. (2) The patients with low gonial angle had the least forward movement at the point A, and those with a high angle had more forward movement. In comparing the horizontal and vertical movement of the point A, the high angle group showed more horizontal movement while the low angle group showed more vertical movement.