Influence of incisor position control on the mandibular response in growing patients with skeletal Class II malocclusion.

Abstract

INTRODUCTION:

This study aimed to test whether control in maxillary and mandibular incisor position, during treatment with an acrylic splint Herbst appliance, could influence the mandibular response in growing patients with skeletal Class II malocclusion.

METHODS:

The lateral cephalograms of 61 patients (mean age, 12.3 years; standard deviation, 1.6) with skeletal and dental Class II malocclusion were retrospectively analyzed both at baseline and after Herbst appliance removal, using a modified Pancherz cephalomeric analysis. Forty-five patients had received miniscrew in the mandibular arch to control mandibular incisor anchorage. In 21 patients, the maxillary incisors had been proclinated before starting the treatment for deepbite and maxillary incisor lingual inclination. All the patients were categorized a posteriori into 2 homogeneous groups, according to dental overjet reduction: 30 patients with dental overjet reduction (DR) and 31 patients without dental overjet reduction (NDR).

RESULTS:

Both groups presented a significant skeletal correction. However, the change was significantly greater in the NDR group than in the DR group (P <0.01). The mandibular bone base reached a median value of 4.0 mm (interquartile range, 2.5) in the NDR group vs 1.1 mm (interquartile range, 2.8) in the DR group (P <0.001). The 2 groups were also significantly different in terms of the positional change of maxillary incisor, which was proclinated in group NDR and lingualized in group DR (P <0.001).

CONCLUSIONS:

The results showed that dental control of overjet was beneficial to improve the effectiveness of Herbst treatment in increasing mandibular length in growing patients with skeletal Class II malocclusion.

• Authors: Antonio Manni, Sabrina Mutinelli, Carmen Cerruto, Mauro Cozzani
• Journal: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics (Am J Orthod Dentofacial Orthop) Vol. 159 Issue 5 Pg. 594-603 (May 2021) ISSN: 1097-6752 [Electronic] United States
• PMID: 33563504 (Publication Type: Journal Article)
• Copyright: Copyright © 2020 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.

Topics

• Cephalometry
• Child
• Humans
• Incisor
• Malocclusion, Angle Class II (diagnostic imaging, therapy)
• Mandible (diagnostic imaging)
• Maxilla
• Orthodontic Appliances, Functional
• Retrospective Studies