Clinical Trials Study
Copyright ©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Clin Cases. Feb 26, 2023; 11(6): 1299-1309
Published online Feb 26, 2023. doi: 10.12998/wjcc.v11.i6.1299
Efficacy of invisible advancement correction for mandibular retraction in adolescents based on Pancherz analysis
Lei Kong, Xin-Qiang Liu
Lei Kong, Xin-Qiang Liu, Department of Stomatology and Orthodontics, The Affiliated Hospital of Qingdao University, Qingdao 266003, Shandong Province, China
Lei Kong, Xin-Qiang Liu, Department of Stomatology, Qingdao University, Qingdao 266003, Shandong Province, China
Author contributions: Kong L contributed to the conceptualization, methodology, data curation, writing original draft, visualization, investigation of the manuscript; Liu XQ contributed to the clinical treatment, supervision, writing-reviewing of the manuscript.
Institutional review board statement: This study was reviewed and approved by the Medical Ethics Committee of The Affiliated Hospital of Qingdao University (authorisation number: QYFYWZLL26729).
Clinical trial registration statement: The clinical study website registration has been completed prior to the start of the project.
Informed consent statement: All patients gave written informed consent before participation in this study.
Conflict-of-interest statement: All the authors report no relevant conflicts of interest for this article.
Data sharing statement: Publications conditional upon the agreement of the authors to make freely available any materials and information described in their publication that may be reasonably requested by others.
CONSORT 2010 statement: The authors have read the CONSORT 2010 Statement, and the manuscript was prepared and revised according to the CONSORT 2010 Statement.
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: https://creativecommons.org/Licenses/by-nc/4.0/
Corresponding author: Xin-Qiang Liu, MD, Chief Physician, Professor, Department of Stomatology and Orthodontics, The Affiliated Hospital of Qingdao University, No. 16 Jiangsu Road, Qingdao 266003, Shandong Province, China. dentistlxq@163.com
Received: October 21, 2022
Peer-review started: October 21, 2022
First decision: December 13, 2022
Revised: January 3, 2023
Accepted: February 8, 2023
Article in press: February 8, 2023
Published online: February 26, 2023
Abstract
BACKGROUND

Mandibular retraction is the main etiological mechanism of class II malocclusion in China and the subsequent distal molar relationship can cause functional discomfort in mastication, breathing and the temporomandibular joint. The use of mandibular advancement (MA) devices has recently emerged as an adolescent mandibular retraction treatment; however, current studies regarding the effect thereof are relatively few, and there is lack of sufficient clinical support.

AIM

To investigate the clinical effect of invisalign MA on the treatment of mandibular retraction in adolescents.

METHODS

This study included 30 adolescent patients who underwent treatment with the MA appliances from December 2017 to June 2021. The lateral cephalometric data before and after treatment were collected and imported into Dolphin Imaging software. The changes were measured by linear measurement superimposed with lateral cephalometric trajectory based on the Pancherz technology.

RESULTS

There was no significant difference in the length and position of maxilla before and after the treatment. The position of the mandible moved 3.13 mm, the length increased 4.14 mm, the mandibular ramus length increased 4.09 mm, the body length increased 4.25 mm, and the position of the condyle moved 1.03 mm forward after treatment. Additionally, changes in the incisor sagittal position and labial inclination were observed. The position of the upper incisor point moved back 1.33 mm, without statistical difference, the inclination and tooth angle decreased by 3.44° and 4.06°, respectively; the position of the lower incisor point was moved 2.98 mm, and the inclination and tooth angle increased by 2.62° and 1.23°, respectively. Furthermore, changes in the incisor overjet and molar relationship were seen. Overjet decreased by 4.31 mm, of which 1.78 mm was due to dental factors, accounting for 41.3% of the effect as opposed to 58.7% due to skeletal factors. Molar relationship improved 3.87 mm, with 1.34 mm due to dental factors, and dental and skeletal factors were accounted for 34.6% and 65.4% of the effect, respectively.

CONCLUSION

For adolescent patients with mandible retraction, invisalign MA can effectively promote the mandible growth, and it was proven to be mainly due to skeletal effects.

Keywords: Mandibular retraction, Adolescent, Pancherz technology, Functional correction, Invisible appliance, Mandibular advancement

Core Tip: This study aimed to investigate the clinical effect of invisalign mandibular advancement (MA) in the treatment of mandibular retraction in adolescents. In addition to the conventional cephalometric analysis method, Pancherz analysis was used to separate the skeletal and dental effects. The results of this study show that invisalign MA can effectively promote the adolescent mandible growth, improve the incisor overjet and molar relationship, and it was proven to be mainly due to skeletal effects.