Final Maxillary Incisor Inclination in Class II Div 1 Malocclusion Treated with Standard Edge Wises or Straight Wire Appliances

Abstract

Introduction: There are different orthodontic treatment systems, and currently the most common include standard edgewise and straightwire. Achieving ideal axial inclinations of all teeth at the end of active treatment is regarded as one of the criteria to possess a functional occlusion. As the frequency of use of preadjusted edgewise appliance become increasingly prevalent, it is important to compare them with standard edgewise appliances. Aim: Considering the fact that the buccolingual angle of the crown has significant effect on the treatment outcomes, the present paper aims at comparing the treatment outcomes and buccolingual angle of crowns in patients treated with standard edgewise and straightwire (MBT). Materials and Methods: This retrospective cohort study compared 100 cephalometric radiographs from 50 class II division 1 patients extracting the maxillary first premolar with twenty-five patients being treated with an edgewise system and 25 patients with straightwire system. The cephalometric landmarks were selected in hard and soft tissue. Linear and angular measurements were used to investigate the soft and hard tissue. U1-SN was used during the cephalometric analysis to measure the inclination of the maxillary incisors. Data analysis was performed using ANCOVA (Analysis of Covariance) at the significant level of 0.05 in SPSS ver. 23. Results: There was no significant difference between the two study groups in terms of gender and age (p>0.05). Also, the buccolingual angle of the crowns was similar between the two groups. Considering the adjustment of the pre-intervention effect, the mean of the U1-SN after the intervention did not show a statistically significant difference between the two groups (F=0.01, P=0.942). The result of ANCOVA was significant only for the OCC Plan _FH after the intervention between two groups (F=4.65, P=0.036). Conclusion: The present study concluded that the buccolingual angle of the crowns was similar between the two groups.

Keywords

• orthodontic appliance design
• orthodontic brackets
• tooth movement techniques
• torque