EVALUATION OF SOFT TISSUE CHANGES AFTER USE OF TWIN BLOCK VERSUS HERBST APPLIANCE IN CLASS II PATIENTS
The Objective of this study was to compare the mean changes in soft tissue parameters in Class II patients treated by Twin Block versus Herbst appliances .140 Class II , division 1, mandibular retrognathic patients coming to orthodontic department of the Dental section CH&ICH Lahore were divided into two groups. Seventy patients were randomly allocated to one of two functional appliance treatment groups. Both group comprised of 30 Female and 40 Male. First Group was treated with the Twin Block appliance. The second group received treatment with Herbst appliance. Pre-treatment (T0) and post-treatment (T1) Lateral cephalograms were used to evaluate soft tissue changes. Student t test was used to compare mean changes in soft tissue profile parameters in both groups. P value < 0.05 was considered as significant.Mean age of patients were 12.06 0.97 years. 60 Patients (42.8%) were males while 80 patients (57.14%) were females. Significant mean difference (p-value < 0.001) was observed between pre-treatment and post-treatment values of H angle in both groups. Pre-treatment to post-treatment mean difference for VRL-Si, VRL-Pog were more significant in Twin block treated Group.This study concluded that both Herbst and Twin Block significantly changed the soft tissue profile but greater advancement of soft tissue pogonion (VRL-Pog) and lower lip (VRL-Si) were observed in Twin Block group.