tailieunhanh - báo cáo khoa học: " A radiographic analysis of tooth morphology following the use of a novel cyclical force device in orthodontics Chung H Kau"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: A radiographic analysis of tooth morphology following the use of a novel cyclical force device in orthodontics Chung H Kau | Kau Head Face Medicine 2011 7 14 http content 7 1 14 HEAD FACE MEDICINE RESEARCH Open Access A radiographic analysis of tooth morphology following the use of a novel cyclical force device in orthodontics Chung H Kau Abstract Background The purpose was to determine whether or not a novel device used in conjunction with orthodontic treatment produced root resorption shown on 3D images generated from a new cone beam computerized tomography. Methods Subjects were actively recruited and those who received braces for the first time were invited to participate. Patients were assigned to receive a functioning device and used the devices for 20 min daily for a six month study period. CBCT images were taken of the dentition at the start of treatment and at the end of the study period. Results 14 subjects out of a possible 17 subjects completed using the device during the study period. The mean age of the subjects was years. Measurements of all teeth present were made from the mesial buccal roots of the first molar on one side of the dental arch to the mesial buccal roots of the first molar on the opposing side of the same arch. These measurements were recorded as linear lengths in mm. A paired f-test was used to determine if significant differences occurred for root lengths at the end of treatment compared to the start of treatment for each of the individual tooth groups. No statistical differences were noted for root length changes above mm and 1 mm. Conclusions No statistically significant findings were noted for root length change at the end of treatment compared to the start of treatment when using this novel robotic device. No significant differences were noted between roots of anterior and posterior teeth. No clinically significant changes between root lengths were noted above mm. Introduction The clinical practice of orthodontics has been based on movement of teeth through alveolar bone using biomechanical methods within a safe .