Longitudinal Study of ANB Angle Changes in Skeletal Class II Patients Treated with Kloehn Cervical Headgear

Roberto M. A. LIMA FILHO, Anna Letícia LIMA, Antonio Carlos de Oliveira RUELLAS

This is a longitudinal investigation to evaluate ANB changes in skeletal Class II patients submitted to Kloehn cervical headgear treatment. The sample consisted of 120 lateral cephalograms obtained at pretreatment (T1), posttreatment (T2), and postretention (T3) phases, of 40 patients (18 males and 22 females of an average age of 10 years and a half in phase T1, 13 years and half in phase T2 and 23 years and a half in phase T3) treated with cervical traction with expanded inner bow (4 to 8 mm) and long outer bow bent upwards off the horizontal 10º to 20º in relation to the inner bow. The onset of treatment was either at the late mixed dentition or at the beginning of the permanent dentition. The force applied for the 40 patients averaged 450g and the use of the appliance recommended was 12 to 14 hours per day with monthly adjustment. Student “t” test was used for comparison between treatment phases. Results revealed that skeletal Class II correction with Kloehn cervical headgear was found to be stable long-term.

Keywords: Skeletal Class II. Kloehn Cervical Headgear. ANB Angle.

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