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Influence of extraction and nonextraction orthodontic treatment in Japanese-Brazilians with class I and class II division 1 malocclusions.
Am J Orthod Dentofacial Orthop. 2005 Jan; 127(1):30-6.AJ

Abstract

BACKGROUND

The primary objective of this retrospective, longitudinal, cephalometric investigation was to study the influence of extraction and nonextraction orthodontic treatment on the facial height of Japanese-Brazilian children with Class I and Class II Division 1 malocclusions.

METHODS

The sample included 59 mesocephalic patients distributed into 4 groups: group 1: Class I patients treated with 4 first premolar extractions; group 2: Class I patients treated nonextraction; group 3: Class II Division 1 patients treated with 4 first premolar extractions; group 4: Class II Division 1 patients treated nonextraction. The overall initial mean age of the groups was 12.14 years, and all groups were treated with standard edgewise appliances for a mean period of 2.49 years. The pretreatment and posttreatment stage comparison and the intergroup comparison of the treatment changes were conducted between extraction and nonextraction groups in the Class I and Class II malocclusion samples with t tests.

RESULTS

The amounts of changes in the absolute magnitude of posterior and anterior facial heights and in the ratios of lower posterior facial height/lower anterior facial height and lower anterior facial height/total anterior facial height were similar between extraction and nonextraction treatment in both Class I and Class II malocclusions.

Authors+Show Affiliations

Hayasaki SM
Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil.
Castanha Henriques JF
No affiliation info available
Janson G
No affiliation info available
de Freitas MR
No affiliation info available

MeSH

Analysis of VarianceAsian PeopleBicuspidBrazilCephalometryChildFemaleHumansJapanLongitudinal StudiesMaleMalocclusion, Angle Class IMalocclusion, Angle Class IIMaxillofacial DevelopmentOrthodontics, CorrectiveRetrospective StudiesStatistics, NonparametricTooth ExtractionVertical Dimension

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

15643412

Citation

Hayasaki, Sandra Márcia, et al. "Influence of Extraction and Nonextraction Orthodontic Treatment in Japanese-Brazilians With Class I and Class II Division 1 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. 127, no. 1, 2005, pp. 30-6.
Hayasaki SM, Castanha Henriques JF, Janson G, et al. Influence of extraction and nonextraction orthodontic treatment in Japanese-Brazilians with class I and class II division 1 malocclusions. Am J Orthod Dentofacial Orthop. 2005;127(1):30-6.
Hayasaki, S. M., Castanha Henriques, J. F., Janson, G., & de Freitas, M. R. (2005). Influence of extraction and nonextraction orthodontic treatment in Japanese-Brazilians with class I and class II division 1 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, 127(1), 30-6.
Hayasaki SM, et al. Influence of Extraction and Nonextraction Orthodontic Treatment in Japanese-Brazilians With Class I and Class II Division 1 Malocclusions. Am J Orthod Dentofacial Orthop. 2005;127(1):30-6. PubMed PMID: 15643412.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of extraction and nonextraction orthodontic treatment in Japanese-Brazilians with class I and class II division 1 malocclusions. AU - Hayasaki,Sandra Márcia, AU - Castanha Henriques,José Fernando, AU - Janson,Guilherme, AU - de Freitas,Marcos Roberto, PY - 2005/1/12/pubmed PY - 2005/2/11/medline PY - 2005/1/12/entrez SP - 30 EP - 6 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 - 127 IS - 1 N2 - BACKGROUND: The primary objective of this retrospective, longitudinal, cephalometric investigation was to study the influence of extraction and nonextraction orthodontic treatment on the facial height of Japanese-Brazilian children with Class I and Class II Division 1 malocclusions. METHODS: The sample included 59 mesocephalic patients distributed into 4 groups: group 1: Class I patients treated with 4 first premolar extractions; group 2: Class I patients treated nonextraction; group 3: Class II Division 1 patients treated with 4 first premolar extractions; group 4: Class II Division 1 patients treated nonextraction. The overall initial mean age of the groups was 12.14 years, and all groups were treated with standard edgewise appliances for a mean period of 2.49 years. The pretreatment and posttreatment stage comparison and the intergroup comparison of the treatment changes were conducted between extraction and nonextraction groups in the Class I and Class II malocclusion samples with t tests. RESULTS: The amounts of changes in the absolute magnitude of posterior and anterior facial heights and in the ratios of lower posterior facial height/lower anterior facial height and lower anterior facial height/total anterior facial height were similar between extraction and nonextraction treatment in both Class I and Class II malocclusions. SN - 0889-5406 UR - https://www.unboundmedicine.com/medline/citation/15643412/Influence_of_extraction_and_nonextraction_orthodontic_treatment_in_Japanese_Brazilians_with_class_I_and_class_II_division_1_malocclusions_ DB - PRIME DP - Unbound Medicine ER -