Study of occlusal-maxillo-facial 3-dimentional structural change of orthodontic therapy of crossbite malocclusion by modified ACTIVATOR appliance

Abstract

Occlusal-maxillo-facial structural change of crossbite malocclusion after orthodontic therapy by modified ACTIVATOR appliance was investigated. Eighty crossbite cases of deciduous dentition and mixed dentition were treated by modified ACTIVATOR. Through pre- and post-treatment analysis of stone model, Schuller's position X-ray and craniofaciometrics, the change in craniofacial length, width and height in early-phase crossbite malocclusion was studied. The results showed that there was no significant change in the width of maxillary and mandibular dental arch. Maxillary length and protrusion was increased significantly, upper incisors slopped labially. The lower incisors slopped lingually, mental angle decreased more severely. The lower and posterior facial height was increased to normal level.

Keywords

modified ACTIVATOR / crossbite / stone model measurement / temporomandibular joint measurement / craniofaciometrics

References

[1] RickettsR M. The influence of orthodontic treatment on facial growth and development. Angle Orthod, 1960, 30103-103

[2] SakamatoT. Effective timing for the application of orthopegic force in the skeletal class malocclusion. Am orthod, 1980, 80(4): 411-411