Prediction Model for Future Success of Early Orthopedic Treatment of Class III Malocclusion

Mi-So Lee; Van Nhat Thang Le; Jae-Gon Kim; Yeon-Mi Yang; Dae-Woo Lee

doi:10.3390/children10020355

Prediction Model for Future Success of Early Orthopedic Treatment of Class III Malocclusion

Children (Basel). 2023 Feb 10;10(2):355. doi: 10.3390/children10020355.

Authors

Mi-So Lee^{1

2

3}, Van Nhat Thang Le⁴, Jae-Gon Kim^{1

2

3}, Yeon-Mi Yang^{1

2

3}, Dae-Woo Lee^{1

2

3}

Affiliations

¹ Department of Pediatric Dentistry and Institute of Oral Bioscience, School of Dentistry, Jeonbuk National University, Jeonju 54896, Republic of Korea.
² Research Institute of Clinical Medicine, Jeonbuk National University, Jeonju 54907, Republic of Korea.
³ Biomedical Research Institute, Jeonbuk National University Hospital, Jeonju 54907, Republic of Korea.
⁴ Faculty of Odonto-Stomatology, Hue University of Medicine and Pharmacy, Hue University, Hue 49120, Vietnam.

Abstract

This study aimed to identify predictors for successful post-treatment outcomes in early orthopedic class III malocclusion treatment with a facemask and hyrax expander appliance. The study was performed on lateral cephalograms from 37 patients at the start of treatment (T0), post-treatment (T1), and a minimum of three years after treatment (T2). The patients were grouped as stable or unstable according to the existence of a 2-mm overjet at T2. For statistical analysis, independent t-tests were used to compare the baseline characteristics and measurements of the two groups, considering a significance level of < 0.05. Thirty variables of pretreatment cephalograms were considered during logistic regression analysis to identify predictors. A discriminant equation was established using a stepwise method. The success rate and area under the curve were calculated, with AB to the mandibular plane, ANB, ODI, APDI, and A-B plane angles as predictors. The A-B plane angle was the most significantly different between the stable and unstable groups. In terms of the A-B plane angle, the success rate of early class III treatment with a facemask and hyrax expander appliance was 70.3%, and the area under the curve indicated a fair grade.

Keywords: class III malocclusion; orthopedic treatment; prediction.

Grants and funding

This paper was supported by research funds of Jeonbuk National University in 2022. Moreover, this work was supported by the Biomedical Research Institute, Jeonbuk National University Hospital.