X-RAY CEPHALOMETRIC FEATURES OF NASAL AND GNATHIC SECTIONS IN DIFFERENT FACIAL SKELETON GROWTH TYPES

Abstract

Based on the results obtained through studying head lateral teleroentgenograms of 68 patients (aged 18−25) with a full set of permanent teeth and physiological occlusion, a method was developed, which allows exploring the angular parameters of the nasal (n-cond-sn) and gnathic (sn-cond-gn) face sections. In view of the type of the face gnathic part growth, the patients were divided into three groups: Group 1 (n=27) included patients with a neutral type of face growth and a mandibular angle of 119°−123°. Group 2 (n=22) were patients featuring a vertical type of the face gnathic part growth with a mandibular angle exceeding 123°. In patients of Group 3 (n=19), the mandibular angle was below 119° along with the horizontal type of the face gnathic part growth. Patients with physiological occlusion were found to have the nasal part angular parameters (n-cond-sn) relatively stable at different types of jaw growth: neutral type, 29.85±0.22°; vertical type, 30.01±0.22°; horizontal type, 29.96±0.29°, respectively. The angular parameters of the face gnathic part (sn-cond-gn) are variable and were identified based on the type of face growth, whereas the dimensional parameters in case of the vertical growth type (33.02±0.26°) exceed similar indices in people who featured the neutral (30.04±0.28°) and horizontal (26.92±0.29°) growth types. The angular parameters obtained for the nasal (n-cond-sn) and gnathic (sn-cond-gn) parts of the face can be employed as stable reference points when assessing the jaw growth types in patients with physiological occlusion, detecting facial features with maxillofacial anomalies and deformities (both congenital and acquired), and serve as a criterion pointing at the effectiveness of prosthetic and orthodontic treatment.