1 Assistant Professor of Orthodontics Department, Hamedan University of Medical Sciences
Introduction: There are several studies to evaluate lento-skeletal changes after treatment of skeletal class 2 malocclusion with Dr Farmand's functional appliance but in non of them facial harmony has been considered. The purpose of the present study is evaluation of facial harmony in addition to dentoskeletal changes after treatment with Dr Farmand 's functional appliance.
Materials and Methods: Initial and final cephalograms of eighteen treated skeletal class 2 div 1 patients have been selected. All of them had been treated with Farmand's appliance before termination of growth spurt. Each cephalogram was separately traced two times. Means of before and after treatment data were compared with paired t-test.
Results: Skeletal class 2 relationship has been successfully corrected through decreasing ANB angle (1.88±1.75, p=0.00), 66 and angle of convexity(-1.47±1.21 , p=0.00), and Also dental changes (upper incisor retrusion and lower incisor protrusion) were occurred (decrease of U1 to SN was -4.77±4.71 , p=0.00 and increase in IMPA was +3.93±2.87 ,p=0.00). Soft tissue changes involved retrusion of upper lip to E-line (-2.86±1.88, p=0.00) and decrease of upper sulcus dept (-1.55±2.04, p=0.005) and lower sulcus dept (-2.44±1.85 ,p=0.00) which played an important role in improvement of facial harmony . Lower lip was placed more anteriorly relative to H-line (1.37±1.48 p=0.001) which is not desirable in profile harmony.
Conclusion: Dr Farmand's functional appliance is effective in treating skeletal class 2 patients by producing skeletal as well as dental improvement. Soft tissue harmony also is improved but final position of lower lip must be regarded more carefully.