Dentoskeletal and Soft Tissue Changes in Class II Subdivision Treatment with Asymmetric Extraction Protocols

Overview

Journal Prog Orthod

Publisher Springer

Specialty Dentistry

Date 2017 Dec 5

PMID 29199373

Citations 2

Authors

Guilherme Janson

Eduardo Beaton Lenza

Rodolfo Francisco

Aron Aliaga-Del Castillo

Daniela Garib

Marcos Augusto Lenza

Affiliations

Soon will be listed here.

Abstract

Background: This study cephalometrically compared the dentoskeletal and soft tissue changes consequent to one and three-premolar extraction protocols of class II subdivision malocclusion treatment.

Methods: A sample of 126 lateral cephalometric radiographs from 63 patients was selected and divided into two groups. Group 1 consisted of 31 type 1 class II subdivision malocclusion patients treated with asymmetric extractions of two maxillary premolars and one mandibular premolar on the class I side, with an initial mean age of 13.58 years. Group 2 consisted of 32 type 2 class II subdivision malocclusion patients treated with asymmetric extraction of one maxillary first premolar on the class II side, with an initial mean age of 13.98 years. t test was used for intergroup comparison at the pre- and posttreatment stages and to compare the treatment changes.

Results: Group 1 had greater maxillomandibular sagittal discrepancy reduction and greater maxillary first molar extrusion. Group 2 had mandibular incisor labial inclination and protrusion, and group 1 had mandibular incisor lingual inclination and retraction. Maxillary molar asymmetry increased in group 2, while mandibular molar asymmetry increased in group 1.

Conclusions: The treatment changes produced by these two class II subdivision protocols are different to adequately satisfy the different needs for types 1 and 2 class II subdivision malocclusions.

Citing Articles

Asymmetric Extraction Decision in Orthodontics.

Baxi S, Bhatia V, Tripathi A, Kumar P, Pandey A, Dilip Taide P Cureus. 2023; 15(6):e40162.

PMID: 37431361 PMC: 10329744. DOI: 10.7759/cureus.40162.

Treatment effects of the MARA appliance and Activator-Headgear combined with fixed appliances in Class II division 1 malocclusion patients: A retrospective longitudinal study.

Brito D, Bellini-Pereira S, Foncatti C, Henriques J, Janson G Dental Press J Orthod. 2023; 27(6):e2221174.

PMID: 36995843 PMC: 10042463. DOI: 10.1590/2177-6709.27.6.e2221174.oar.

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