Effects of a novel magnetic orthopedic appliance (MOA-III) on the dentofacial complex in mild to moderate skeletal class III children.

Abstract

INTRODUCTION:

The objective of this study was to evaluate the changes of skeletal and dental structures in mild to moderate skeletal Class III children following the use of a new magnetic orthopedic appliance (MOA-III).

METHODS:

A total of 36 patients (14 boys and 22 girls, mean age 9 years and 5 months) who presented with a mild to moderate skeletal Class III jaw discrepancy were treated with MOA-III. Another group of 20 untreated patients (9 boys and 11 girls, mean age 9 years and 2 months) with the same level of deformity served as the control group. The average treatment time was 6.6 months. Radiographs were taken at the same time intervals for both groups. A paired t test was used to determine the significant differences before and after treatment, and a two-sample t test was used to analyze the differences between the treatment and control groups.

RESULTS:

The anterior crossbite in all subjects was corrected after MOA-III therapy. The maxillomandibular relationship showed favorable changes (ANB, Wits, overjet increased significantly, P < 0.001). The maxilla was anteriorly positioned (SNA, ptm-A, ptm-S increased significantly, P < 0.001) with clockwise rotation (PP-FH increased, P < 0.001). The mandible showed a slight downward and backward rotation (SNB decreased, P < 0.05, MP-SN, Y-axis increased, P < 0.05). The length of the mandibular body showed no significant changes (Go-Pg, P > 0.05). Significant upper incisor proclination and lower incisor retroclination were observed (UI-NA increased, P < 0.001, LI-NB, FMIA decreased, P < 0.001). The upper lip moved forward, and the lower lip moved backward (UL-EP increased, P < 0.001, LL-EP decreased, P < 0.05). In the control group, most of the parameters showed normal growth, except for some unfavorable mandibular skeletal and soft tissue changes (Go-Pg, Go-Co, MP-SN, N'-SN-Pg' increased, P < 0.001). Significant positive changes were induced with the MOA-III appliance compared to the untreated group.

CONCLUSIONS:

The MOA-III was effective for the early treatment of a mild to moderate Class III malocclusion in children.

• Authors: Ning Zhao, Jing Feng, Zheng Hu, Rongjing Chen, Gang Shen
• Journal: Head & face medicine (Head Face Med) Vol. 11 Pg. 34 (Oct 14 2015) ISSN: 1746-160X [Electronic] England
• PMID: 26468063 (Publication Type: Journal Article)

Topics

• Adolescent
• Cephalometry
• Child
• Female
• Humans
• Magnetic Phenomena
• Male
• Malocclusion, Angle Class III (surgery)
• Mandible
• Maxilla
• Maxillofacial Development
• Orthodontic Appliance Design
• Orthopedic Fixation Devices (adverse effects)