Evaluation of the treatmaent effects of the Twin Block appliance in different cervical vertebral maturation stages amognst patients with mandibular retrognathism referring to an orthodontics office in Kerman, 2017

The main objective of this study is to evaluate the treatment effects of Twin Block appliance amongst patients with different cervical vertebral maturation stages. The designed clinical trial has no control group and the effects of intervention on each patient before and after treatment are compared with himself. Among patients who come to one of the private orthodontic treatment centers in Kerman, patients with mandibular retrognathism are selected randomly based on the aforementioned inclusion and exclusion criteria. The patients with skeletal and dental class II relationship are from the inclusion criteria in this study who have mandibular retrognathism. Patients who do not have full cooperation in using the device for at least 16 hours a day are excluded. The sample size estimated for this study is 46 people. First, the alignment of the upper jaw anterior teeth is performed. Having eliminated the dental interferences, the appliance is delivered to the patient. The device will be used as long as the patient's overjet reaches zero, and afterwards by applying lateral cephalographs which are prepared before and after the treatment, dental effects of the treatment, such as changes in IMPA angle and skeletal effects like changes in ramus length in different stages of cervical vertebral maturation are studied and compared.

Kerman University of Medical Sciences