Effects on the maxilla and cranial base caused by cervical headgear: a longitudinal study.
OBJECTIVE
The aim of this study is to test the possible orthopedic effects of cervical headgear on the cranial base and maxilla.


METHODS
a sample consisting of 79 subjects with skeletal class II malocclusion was divided into two groups. The experimental group was made up of 41 patients all treated with cervical headgear. The control group included a total of 38 non-treated patients. Each one of these groups was then subdivided according to age into one of three groups: prepubescent, pubescent or post-pubescent. Cephalometric parameters were compared in both groups in order to measure the cranial base angle and the vertical and sagittal position of the maxilla. Additionally, cephalometric superimpositions taken at the beginning and end of the study were compared.


RESULTS
results revealed significant differences in the cranial base angle and in the SNA angle (p<0.05). However, no differences were observed in the variables that measure the maxillomandibular relationship. While no changes were noted in the palatal plane slope, a flattening of the cranial base was found caused by the cervical headgear, in addition to a retrusion of point A that does not mean there was a reduction in the maxillomandibular relationship.


CONCLUSIONS
cervical headgear treatment induces cephalometric flattening of the cranial base and a decrease of the SNA angle.
Complutense University of Madrid, Herreros de Tejada, 24-28016 Madrid, Spain. jalio@iberortodoncia.com
Juan
J
Alió-Sanz
Carmen
C
Iglesias-Conde
José
J
Lorenzo-Pernía
Alejandro
A
Iglesias-Linares
Asunción
A
Mendoza-Mendoza
Enrique
E
Solano-Reina
D000293:Adolescent; D002508:Cephalometry; D002648:Child; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008437:Maxilla / Q000033:anatomy & histology*; D012189:Retrospective Studies; D019291:Skull Base / Q000033:anatomy & histology*