Cephalometric evaluation of treatment effects of herbst and XBOW appliances in skeletal class II patients

The aim of this study was to compare the effects of Herbst and Xbow appliances on skeletal, dentoalveolar structures and soft tissues in the treatment of skeletal class II malocclusion cases in pubertal growth spurt due to deficiency of mandibular growth. The study sample included 46 patients with a mean age of 12.08 ±1.23 years in the period of pubertal growth spurt with Class II malocclusion due to deficiency of mandibular growth. The sample was randomly divided into groups. Herbst fixed functional appliance was applied to 16 patients and Xbow fixed functional appliance was applied to 19 patients. The control group was retrospectively constructed using the archival records of 11 patients. Appliances were kept activated in all cases until incisors came to edge-to-edge contact and hold in place for 7 months by monthly checks. Lateral cephalometric films taken at the beginning of treatment and just after removal of the appliances and lateral cephalometric films obtained from the control group for 7 months were evaluated comparatively. Statistical comparison of the obtained data showed that the overjet and molar relationship corrections were largely dentally by both appliances and the dental effect in the Xbow group was more effective than the Herbst group. Compared with the control group, the Herbst appliance had a stimulating effect on the development of the sagittal direction of the mandibula, whereas the Xbow appliance had limited effect on the sagittal direction development of the mandibula. As a result, it was seen that Xbow and Herbst were effective appliances for correcting Class II malocclusion due to deficiency of mandibular growth in the patients with growth development period. This work was supported by Scientific Research Project Coordination Unit of Karadeniz Technical University. Project number: TDH-2016-5590. Key Words: Class II malocclusion, Crossbow, Fixed functional appliance, Herbst, Xbow