Date: June 2017.
Source: 93rd Congress of the European Orthodontic Society 2017. Montreux, Switzerland.
Aim: To objectively demonstrate the changes of soft tissues after use of a Fränkel functional regulator III (FFR III) modified appliance (Farčnik, 2008) of a skeletal Class III malocclusion
Subject and Methods: Clinical examination of the 6 year old boy revealed a Class III facial appearance in the middle third of the face, an anterior crossbite, a Class III molar relationship, a unilateral posterior crossbite on the right side, midline deviations intraorally, a Class III relationship skeletally and normal growth type. Treatment consisted of full-time wear of the FFR III modified appliance for about 2 years. The patient showed a good level of compliance. Pre-treatment (T0) and 2 year (T1) follow-up facial surface images were obtained, using stereophotogrammetry (3dMD system). The facial appearance and soft tissue analysis were then assessed, by superimposing the faces at T0 and T1. Due to growth a new FFR III modified appliance was made and worn full-time. After 2 years a Class I molar relationship was achieved and no midline deviations were present. Three-dimensional scans were taken at T0 and T1. The facial soft tissue differences were assessed qualitatively and quantitatively. The shell to shell differences were measured and the average distances between the observed regions were calculated at T0 and T1. A colour deviation map was generated to show shell-shell deviations of the superimposed images.
Results: A positive overjet and overbite were achieved in 9 months. In the following year the posterior crossbite was corrected. Changes were greatest in the middle region. Changes in the nose and upper lip regions were smaller than those in the lower lip and chin region. The result was an improvement of the mid-facial retrognathic appearance.
Conclusions: Treatment of Class III in the early mixed dentition is necessary to create conditions for normal occlusal and facial development. With facial surface images accurate measurements of facial morphology and changes associated with treatment were achieved.
Poster: CP69 THREE-DIMENSIONAL EVALUATION OF CLASS III TREATMENT OF A 6 YEAR OLD BOY WITH THE FRÄNKEL FUNCTION REGULATOR III MODIFIED APPLIANCE.
Authors: Bojana Krneta Đokić, Alexei Zhurov, Stephen Richmond, Maja Ovsenik. Department of Dental and Jaw Orthopaedics, University of Ljubljana, Medical Faculty, Slovenia and Applied Clinical Research and Public Health, Cardiff University, School of Dentistry, U.K.
Date: June 2017.