Aims: Assessment of skeletal and dentoalveolar changes in class II division 1 patients after treatment with Seifi's functional appliance in dental school of Shahid Beheshti. University in 2007-2008.
Methods: In this before- after clinical trial study, Seifi's functional appliance was used for 15 patients (mean age: 9.84±1.24 year) with class II division I deep bite maloccIusion. All of them had mandibular deficiency and ANB>4 degrees, OJ and OB>4mm. Lateral cephalometric and panoramic radiographs, primary impression via alginate, intraoral and facial photographs were taken at the beginning of the study and after 10.2±2.01 months. The results were compared to each other. The device was two pieces and consisted of an acrylic cap on mandibular incisors and a mid palatal screw and a vertical plate on the upper jaw.
Results: In sagittal dimension ANB, 1-SN and OJ decreased and SNB increased (P<0.05). Changes of SNA and IMPA were not significant(P>0.05). In vertical dimension OB decreased and L6-MP increased(P<0.05).
Conclusion: Due to simultaneous three dimensional correction in transverse, sagittal and vertical dimensions, the patient benefits of the short period of treatment in the golden growth period. Also correction in skeletal and dentoalveolar relations and improvement in profile happens.