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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

Department of Orthodontics, Bauru Dental School, University of São Paulo, Brazil.No affiliation info availableNo affiliation info availableNo affiliation info available

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_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889540604006936 DB - PRIME DP - Unbound Medicine ER -