Evaluation of rotational and vertical dimensional changes of face and jaws following the use of “Fa II “functional device in CL II female patients Dr. Hosseinzadeh-Nik T.,1 Dr. Salem-Milani A.,2 Dr. Habibi M.,3 Dr. Kharazi-Fard MJ.4 1Associate Professor, Orthodontics Department, Faculty of Dentistry. Dental Research Center Tehran University / Medical Sciences, Tehran, Iran.2Dentist, Private Practice, Tehran, Iran. 3Orthodontist, Private Practice, Tehran, Iran. 4Biostatistics Consultant, Dental Research Center, Tehran University / Medical Sciences, Tehran, Iran. Abstract Background & Aim: The functional appliances can influence dentofacial growth of anterior-posterior posture of jaws. However, there would be some changes on other dimensions of face in pre-adolescent age group patients. The aim of this study was to demonstrate the influence of Fa II appliance on vertical and rotational growth of jaws in adolescent female cases. Materials & Methods: This clinical trial investigation was conducted with nineteen female CL II div.l participants who underwent functional therapy with Fa II appliance for 12-18 months. Lateral cephalograms were taken before and after treatment in order to compare them with untreated control subjects as well as the template group. Student t-test was used for statistical data analysis. Results: The analysis of data showed that vertical dimensions were increased specially in lower part of the face (P<0.01). No rotational changes occurred on the upper and lower jaws (mandible P=0.86 and maxilla P=0.58). Direct relationship was observed between increasing vertical dimension on the posterior part of the face and forward rotation of mandible (P=0.004) and dentoalveolar drift of mandible with backward rotation (P=0.034). Conclusion: Based on the results of this clinical trial,the Fa II functional appliance can increase the vertical dimension of face (posterior-anterior) and help with rotation of both jaws in positive directions; which is preferable therapy for normal and short CL II cases. Key words: Skeletal CL II- functional appliance- Rotation. Corresponding Author: Dr. Habibi M., Orthodontist, Private Practice, Tehran, Iran. e.mail: maryamhabyby@yahoo.com | 
