Assessment of Teeth Length Among Adult Angle Ⅱ1 Patients with Different Divergent Patterns after Orthodontic Treatment
Objective The difference of root resorption before and after orthodontic treatment and the correlation between incisor sagittal movement and root resorption were analyzed by measuring the tooth length of Angle Ⅱ1 patients with different divergent patterns in adult.Methods A total of 60 extraction cases were selected from the Affiliated Stomatological Hospital of Nanchang University,and divided into three groups according to different face angles.The CBCT data before and after treatment were imported into dolphin-imaging 11.95 software,then corrected the head position and selected measurement planes.Respectively,to measure the length of the upper and lower incisors,the canine and the first molar,and the sagittal movement of the upper and lower incisors.The obtained data were analyzed statistically.Results There was no difference in the length of the corresponding teeth on the left and right sides before treatment.After treatment,the root length of the three groups decreased(P＜0.01),and the high-angle group decreased mostly.There was no difference between the three groups in incisor margin and apical adversarial amount(P＞0.05).There was a positive correlation between the movement of the left central incisor and the reduction of tooth length,and the correlation was 0.663 in the low-angle group,0.618 in the high-angle group and 0.635 in the mean-angle group(all P＜0.01).Conclusion There are teeth roots resorption in different degrees after extraction treatment in different divergent patterns.
Angle Class Ⅱ division1divergent patternsteeth roots resorptionorthodontic extraction treatment
万方数据
维普
