The aim of the present study was to evaluate the cephalometric response to Kloehn extraoral associated to fixed appliances treatment. Initial cephalometric radiographs (T1) and final ones (T2) of two groups composed by 30 patients were selected according to Jarabak index as favorable (hypodivergent) and unfavorable (hyperdivergent). The mean age on the beginning of the treatment was 11.03 years and the final mean age was 14.72, with a mean treatment time of 3.6 years for the favorable group. In the unfavorable group, the initial age was of 11.51 years, and the final age of 15.17, with a mean treatment time of 3.4 years. It was used a X and Y coordinated system to response analysis, representing the dental and skeletal bases movement. The results and treatment responses were analyzed and the favorable and unfavorable groups compared using the t-Student test. There were no statistically significant differences in the cephalometric response of Kloehn extraoral associated to fixed appliances treatment between the two groups. The treatment promoted a restriction of the anterior displacement of maxillary base and a lesser mandibular anterior displacement. Considering the upper teeth movement, there was restriction of the mesial and extrusive movement of the upper molars in the favorable group while the lower teeth movement was minimum on the anterior and vertical sense.
Cephalometrics; Class II; Extraoral; Kloehn
