ĐẶC ĐIỂM XƯƠNG HÀM DƯỚI TRÊN PHIM SỌ NGHIÊNG TELE TỪ XA (CEPHALOMETRICS) Ở BỆNH NHÂN SAI LỆCH XƯƠNG LOẠI III

Abstract

Class III malocclusion is considered a complex cranio-facial disorder, which may represent mandibular prognathism or maxillary retrognathism, or a combination of both. Understanding the characteristics of cranio-facial growth, especially mandibular structures in this group of patients will help doctors determine the timing and mechanics of treatment. The study aimed to describe the characteristics of the mandibule on Cephalometrics films in patients with class III malocclusion at the Institute of Odonto-Stomatology - Hanoi Medical University. Pretreatment lateral cephalometric radiographs of 70 patients with 18 years or older, with no history of trauma or craniofacial anomalies, were measured, analyzed and classified into short, average, and long faces. Results: in the different combinations between maxillomandibular relationships in the class III group, prognathic mandible is accounted for 55.72%, followed by the retrognathic maxilla and the 17.14% is due to a combination of both. Among the patients participating in the study, 37 patients have average face, 19 patients with short face and 14 patients with long face. The characteristics of ramus height, mandibular body length and mandibular unit length of the male subjects are higher than the corresponding values of the female subject group.