Study Of The Clinical Effects Of Reformtive Activator On The Treatment Of Angle Class â…¡ Division 1 Malocclusion During The Later Stage Of Dental Transitional Period

Objective:The purpose of this study was to search for an effective and comfortable method on the treatment of angle classⅡdivision 1 malocclusion. To improved the retention of classic Activator, the author combined the advantages of Twin-Block and FR-Ⅱwith Activator. Meanwhile, the study was used to detect if the reformative Activator can abbreviate the course of treatment. We also checked the clinical effects of the improved Activator.Materials and methods:Six patients who had the symptom of angle classⅡdivision 1 malocclusion and were treated by reformative Activator in the department of orthodontics in Shandong stomatological hospital were selected as the subject investigated targets. Lateral cephalometric radiographs of target patients were taken by the unique operator by using the same machine before and after treatment and the pictures were pointed, ploted and measured by the unique doctor. There are 13 cephalometric landmarks,4 reference planes and 18 measurement item in total. The results were analyzed by SPSS 13.0 software. Results:1 The reformative Activator can meet the requirement of retention by embrasure hook, an e-arm clasp and plastic base. It could prevent inhibiting the growing development of the maxillary bone, when the maxilla is in normal condition.2 The reformative Activator should be used 10 hours per day, and the total course of the treatment is 5.3±1.4 months in average. The patients are 9.3±2.1 years old in average.3 The measurement results of the Lateral cephalometric radiographs of target patients reflected that the reformative Activator could meet the requirement of treatment. After the treatment, the OB, OJ and ANB reached the standard value. Both the maxilla and mandible moved forward during the course of the treatment. The torque of the upper incisor decreased, while that of the lower incisor increased. Besides, the upper lip moved backward, and the lower lip moved forward. The outline of the patients is improved.Conclusions:1 The reformative Activator is more flexible in retention than the classic Activator, because it combined the advantages of Twin-Block and FR-Ⅱ.2 The reformative Activator should be used 10 hours per day, and the total course of the treatment is 5.3±1.4 months in average. The patients are 9.3±2.1 years old in average.3 The measurement results of the Lateral cephalometric radiographs of target patients reflected that the reformative Activator could meet the requirement of treatment. After the treatment, the OB, OJ and ANB reached the standard value. Both the maxilla and mandible moved forward during the course of the treatment. The torque of the upper incisor decreased, while that of the lower incisor increased. Besides, the upper lip moved backward, and the lower lip moved forward. The outline of the patients is improved.