Comparison of forsus frd ez and andresen activator in the treatment of class ii, division 1 malocclusions

Purpose of this study is to evaluate the effects of Forsus? FRD EZ (3M Unitek, Monrovia, CA, USA) appliance and Andresen activator in terms of skeletal, dental and soft tissue changes in actively growing patients presenting with Class II, division 1 malocclusion.Study sample included 60 subjects (study groups, n=40 and control group, n= 20). Inclusion criteria were as follows: Class II division 1 malocclusion, retrognathic mandible, normal or low-angle growth pattern, and peak growth period. First study group consisted of 20 patients (8 females, 12 males) who were treated with Forsus appliance and the second group of 20 patients (9 females, 11 males) received treatment with Andresen activator. Control group (9 females, 11 males) received no treatment. Lateral cephalometric films were taken before treatment, before installation of the appliance and just after removal of the Forsus appliance in the first group. In the second group, radiographs were obtained before and at the end of 6 months of appliance use. Control group of individuals were followed for the same amount of time. Wilcoxon analysis was used to evaluate the differences occurred within each group. Oneway Anova and Bonferroni tests were used for intergroup comparison.Our results revealed that both appliances enhanced mandibular growth, helped increase the length of the mandible and had a restraining growth effect on the maxilla. Anterior face height increased in both of treatment groups, whereas posterior face height had a significant increase in the activator group only. Mandibular incisors were proclined, maxillary incisors were both retroclined and extruded in both of the treatment groups. Mandibular incisors were intruded in the Forsus group. Mesial movement and extrusion of the mandibular ? rst molars were observed in both of treatment groups, whereas both distalization and intrusion of the maxillary ? rst molars were only observed in the Forsus group. Moreover, occlusal plane and palatal plane rotated in clockwise direction as a result of dentoalveolar changes in the Forsus group. Overbite and overjet were reduced and soft tissue profile improved in both of treatment groups.Both appliances proved effective in the treatment of growing individuals having Class II malocclusions with mandibular retrognathia, by a combination of skeletal, dental and soft tissue changes.