Changes in mandibular position in treated Class II division 2 malocclusions in growing and non-growing subjects
Pubblicato online: 30 lug 2021
Pagine: 73 - 81
Ricevuto: 01 mar 2015
Accettato: 01 mar 2016
DOI: https://doi.org/10.21307/aoj-2020-115
© 2016 Kazem AL-Nimri et al., published by Sciendo
This work is licensed under the Creative Commons Attribution 4.0 International License.
Objective
To determine changes in mandibular position after the treatment of patients presenting with Class II division 2 malocclusions and to test the null hypothesis that there is posterior displacement of the mandible in these patients, in comparison with a control group of Class II division 1 subjects.
Materials and methods
The assessed data consisted of pre- and post-treatment cephalometric radiographs of 77 subjects identified with Class II division 1 and Class II division 2 malocclusions matched according to age, gender and treatment duration. All completed fixed appliance orthodontic treatment. The changes in the position of point B, Pogonion and Articulare were determined at the end of treatment by superimposing the cephalometric radiographs on Sella-Nasion line at Sella. Thirteen cephalometric parameters including the distance between Basion and Articular (Ba-Art) were measured at each stage.
Results
In both groups, SNB angle, SNPog angle and Ba-Art distance showed no statistically significant changes. Pogonion was displaced significantly in a forward and downward direction in the growing group, with no significant differences identified between Class II division 1 and Class II division 2 subjects.
Conclusion
The null hypothesis that there is posterior displacement of the mandible in Class II division 2 malocclusion is rejected. The growth pattern of the mandible in both divisions of a Class II malocclusion after orthodontic treatment was found to be similar. (Aust Orthod J 2016; 32: 73–81)