Stomatology ›› 2023, Vol. 43 ›› Issue (9): 819-824.doi: 10.13591/j.cnki.kqyx.2023.09.010

• Clinical Research • Previous Articles     Next Articles

Evaluation of the effect of anchorage control in adult Angle Class Ⅱ tooth extraction case with clear aligner

CHEN Yanling1,ZHANG Sheng2,MAI Lixiang3,OU Bubin4()   

  1. Department of Stomatology, Fujian Medical University Union Hospital, Fuzhou 350000, China
  • Revised:2023-05-02 Online:2023-09-28 Published:2023-09-28

Abstract:

Objective To investigate the clinical application of Invisalign in treatment of Class Ⅱ malocclusion and evaluate its effect of anchorage control. Methods Thirty Class Ⅱ malocclusion patients were enrolled in the study, which was treated by Invisalign with premolar extraction. Terminal position in Clincheck was overcorrected based on CBCT. Cephalograms of pre-treatment and post-treatment were measured. The data were analyzed by SPSS 20.0. Results The overbite of all the 30 patients were back to normal and their lateral profile improved significantly after treatment. The skeletal analysis showed that only point A was significantly changed. SNA decreased by 1.63°±1.45°. The teeth analysis showed that upper and lower anterior teeth were retracted. After treatment, the distance of U1 to NA and L1 to NB reduced by (4.52±3.79) mm and (4.55±3.16) mm, respectively. The differences were statistically significant (P<0.05). The control of vertical direction were effective, while clockwise rotation occured on the occlusion plane. The maxillary first molar analysis showed that the distance of UMC to Ptm and UMA to Ptm increased by (1.51±1.42) mm and (0.99±1.59) mm. The differences were statistically significant (P<0.05). Conclusion Invisalign is an effective appliance for treating Angle Class Ⅱ case, and can control anchorage effectively.

Key words: clear aligner, anchorage, Class Ⅱ malocclusion

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