Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols

Autor(es)

Janson, Guilherme ^[1] ; Lenza, Eduardo Beaton ^[1] ; Francisco, Rodolfo ^[1] ; Aliaga-Del Castillo, Aron ^[1] ; Garib, Daniela ^[1] ; Lenza, Marcos Augusto ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Bauru Dent Sch, Dept Orthodont, Alameda Octavio Pinheiro Brisolla 9-75, BR-17012901 Bauru - Brazil

^[2] Univ Fed Goias, Dent Sch, Dept Orthodont, Goiania, Go - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PROGRESS IN ORTHODONTICS; v. 18, DEC 4 2017.
• Citações Web of Science: 1

Resumo

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. (AU)

• Processo FAPESP: 09/15135-3 - Estudo comparativo das alterações cefalométricas do tratamento da má oclusão de Classe II, subdivisão,realizado com extrações de um ou de três pré-molares.
• Beneficiário: Eduardo Beaton Lenza
• Modalidade de apoio: Bolsas no Brasil - Doutorado