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Cephalometric evaluation of symmetric and asymmetric extraction treatment for patients with Class II subdivision malocclusions.
Am J Orthod Dentofacial Orthop. 2007 Jul; 132(1):28-35.AJ

Abstract

INTRODUCTION

The purpose of this study was to cephalometrically compare the dentoskeletal and soft-tissue changes consequent to orthodontic treatment in patients with Class II subdivision malocclusion treated with asymmetric and symmetric extractions.

METHODS

The sample included 54 patients with Class II subdivision malocclusion and full complement of permanent teeth, including first molars, at the beginning of treatment. Patients in group 1 (n = 27) were treated with the asymmetric extraction of 3 premolars and had initial and final mean ages of 14.07 and 16.71 years. Patients in group 2 (n = 27) were treated with the symmetric extraction of 4 premolars and had initial and final mean ages of 13.35 and 15.75 years. Lateral cephalometric radiographs were taken at pretreatment and posttreatment. T tests were used to compare the groups at pretreatment and the treatment changes between groups.

RESULTS

The results demonstrated that the asymmetric extraction group had significantly less mandibular incisor retraction, less soft-tissue retraction, and greater increases in mandibular incisor extrusion and mandibular molar asymmetry index than the symmetric extraction group.

CONCLUSIONS

It was concluded that the 3-premolar asymmetric extraction protocol in Class II subdivision malocclusions produces significantly less mandibular incisor and soft-tissue retraction than the 4-premolar extraction protocol.

Authors+Show Affiliations

Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil. jansong@travelnet.com.brNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

17628247

Citation

Janson, Guilherme, et al. "Cephalometric Evaluation of Symmetric and Asymmetric Extraction Treatment for Patients With Class II Subdivision Malocclusions." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 132, no. 1, 2007, pp. 28-35.
Janson G, Carvalho PE, Cançado RH, et al. Cephalometric evaluation of symmetric and asymmetric extraction treatment for patients with Class II subdivision malocclusions. Am J Orthod Dentofacial Orthop. 2007;132(1):28-35.
Janson, G., Carvalho, P. E., Cançado, R. H., de Freitas, M. R., & Henriques, J. F. (2007). Cephalometric evaluation of symmetric and asymmetric extraction treatment for patients with Class II subdivision malocclusions. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 132(1), 28-35.
Janson G, et al. Cephalometric Evaluation of Symmetric and Asymmetric Extraction Treatment for Patients With Class II Subdivision Malocclusions. Am J Orthod Dentofacial Orthop. 2007;132(1):28-35. PubMed PMID: 17628247.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cephalometric evaluation of symmetric and asymmetric extraction treatment for patients with Class II subdivision malocclusions. AU - Janson,Guilherme, AU - Carvalho,Paulo Eduardo Guedes, AU - Cançado,Rodrigo Hermont, AU - de Freitas,Marcos Roberto, AU - Henriques,José Fernando Castanha, PY - 2005/03/26/received PY - 2005/07/07/revised PY - 2005/07/07/accepted PY - 2007/7/14/pubmed PY - 2007/7/25/medline PY - 2007/7/14/entrez SP - 28 EP - 35 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 132 IS - 1 N2 - INTRODUCTION: The purpose of this study was to cephalometrically compare the dentoskeletal and soft-tissue changes consequent to orthodontic treatment in patients with Class II subdivision malocclusion treated with asymmetric and symmetric extractions. METHODS: The sample included 54 patients with Class II subdivision malocclusion and full complement of permanent teeth, including first molars, at the beginning of treatment. Patients in group 1 (n = 27) were treated with the asymmetric extraction of 3 premolars and had initial and final mean ages of 14.07 and 16.71 years. Patients in group 2 (n = 27) were treated with the symmetric extraction of 4 premolars and had initial and final mean ages of 13.35 and 15.75 years. Lateral cephalometric radiographs were taken at pretreatment and posttreatment. T tests were used to compare the groups at pretreatment and the treatment changes between groups. RESULTS: The results demonstrated that the asymmetric extraction group had significantly less mandibular incisor retraction, less soft-tissue retraction, and greater increases in mandibular incisor extrusion and mandibular molar asymmetry index than the symmetric extraction group. CONCLUSIONS: It was concluded that the 3-premolar asymmetric extraction protocol in Class II subdivision malocclusions produces significantly less mandibular incisor and soft-tissue retraction than the 4-premolar extraction protocol. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/17628247/Cephalometric_evaluation_of_symmetric_and_asymmetric_extraction_treatment_for_patients_with_Class_II_subdivision_malocclusions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(07)00328-9 DB - PRIME DP - Unbound Medicine ER -