Influence of extraction and nonextraction orthodontic treatment in Japanese-Brazilians with class I and class II division 1 malocclusions. |
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| Authors: | Sandra Márcia Hayasaki José Fernando Castanha Henriques Guilherme Janson Marcos Roberto de Freitas |
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| Institution: | 1. Graduate student;2. Professor;3. Associate professor;1. Resident, Department of Orthodontics, Kangdong Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea;2. Professor, Department of Orthodontics, Kangdong Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea;1. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Dentistry, Ibb University, Ibb, Republic of Yemen;2. Department of Orthodontics and Dentofacial Orthopedics, Faculty of Oral & Dental Medicine, Cairo University, Cairo, Egypt;1. Department of Orthodontics, University of Melbourne, Melbourne, Australia;2. Department of Orthodontics, University of Michigan, Ann Arbor, Mich;3. Department of Orthodontics, University of North Carolina, Chapel Hill, NC;4. Department of Orthodontics, University of Minnesota, Minneapolis, Minn;1. Private practice, Mississauga, Ontario, Canada;2. Noosa Heads, Queensland, Australia;3. Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada;4. Orthodontic Graduate Clinic, School of Dentistry, University of Alberta, Edmonton, Alberta, Canada |
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| 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. |
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