EVALUATION OF CHANGES IN THE PROFILE OF THE FACE DURING ORTHODONTIC TREATMENT OF DISTAL OCCLUSION CAUSED BY ANTEPOSITION OF THE UPPER JAW.

Distal occlusion of the dentition is one of the most common anomalies in the Eastern European population. The widespread use of conservative treatment methods creates the need to predict the results of tooth movement. The problem of the influence of orthodontic treatment on the configuration of the soft tissues of the face is of paramount importance for the orthodontist. Purpose of the study: to evaluate changes in the profile of the face during orthodontic treatment of distal occlusion due to anteposition of the upper jaw. 13 patients aged 18-30 years with distal occlusion caused by anteposition of the upper jaw were examined and treated. A standard examination was carried out, including clinical, anthropometric and radiological diagnostic methods. Orthodontic treatment of all patients was carried out, including the removal of individual teeth in the upper jaw. The study shows the features of changing the configuration of the soft tissue profile of the face in the treatment of patients with distal occlusion of the dentition. As a result of orthodontic treatment, the position of the jaws in the sagittal and vertical planes remained practically unchanged. The soft tissue profile of the face was affected by a change in the position of the incisors. A thorough diagnosis of dentoalveolar anomalies, identification of facial configuration features and knowledge of the changes that accompany orthodontic movements will lead not only to the normalization of occlusion and function, but also to the harmonization of the soft tissues of the face.

CLINICAL AND RADIOGRAPHIC CHANGES FOLLOWING ORTHODONTIC INTRUSION OF OVERERUPTED MAXILLARY MOLARS WITH TWO MINI-IMPLANTS.

Objective - to evaluate clinical and radiographic changes of orthodontic intrusion of upper first molars with two mini-implants, using light intrusion forces, to create the space for prosthetic rehabilitation on the lower jaw. In 20 patients (aged between 26.8 and 45) with secondary deformities in the lateral region in the vertical direction, associated with partial absence of teeth in the lower jaw, and orthodontic preparation for subsequent prosthetics was performed. Each subject was missing 1-2 teeth in the lateral segment. All patients were divided into two groups: with intrusion mechanics with orthodontic implants (20 people) and intrusion with an orthodontic shape memory arch (20 people). The radiographic changes in male and female groups were assessed and compared based on the panoramic radiographs and CBCT data before and after intrusion. In the study 28 molars were fully intruded and their position was normalized with two mini-implants placed palatally and buccally. Mean extrusion time was 7.86±0.42 months (P<0.001), mean intrusion length was 2.97±0.15 mm (P<0.001), and mean change of mesial molar inclination was 2.02±0.44 degrees (P<0,005). The degree of root resorption was evaluated according to CBCT data in Multiplanar reconstruction (MPR); 50% of molars had grade 0 of resorption, 42.85% had grade 1, and 7.15% of molars had grade 2. There was no resorption in the trifurcation area. Intrusion of molars can be successfully accomplished with 2 mini-implants, placed palatally and buccally, with a light traction force (30-50 g) of an elastic chain.

BIOMECHANICS OF CHANGING THE POSITION OF PERMANENT TEETH WITH EARLY LOSS OF THE FIRST TEMPORARY MOLARS.

Premature removal of baby teeth is one of the main causes of deformation of the dentition. The loss of the first temporal molars is most often reported (39.9±4.8%), which leads to displacement of the teeth bordering on the defect, narrowing and shortening of the dental arch, which then leads to retention of premolars, cutting out permanent canines outside the dental arch, pathology of cutting out permanent molars. The aim of the study was to evaluate the biomechanics of permanent teeth migration in patients who prematurely lost their first temporal molars. An anthropometric study of jaw models and orthopantomograms was conducted in 25 patients (age 7-12 years) who had premature loss of the first temporal molars of the upper and lower jaws (age 7-12 years). Complications were evaluated, regularity was revealed and the biomechanics of permanent teeth displacement as a result of the prolonged absence of temporary molars were determined.