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Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols.
Prog Orthod. 2017 Dec 04; 18(1):39.PO

Abstract

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.

Links

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Authors+Show Affiliations

Janson G
Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, 17012-901, Brazil. jansong@travelnet.com.br.
Lenza EB
Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, 17012-901, Brazil.
Francisco R
Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, 17012-901, Brazil.
Aliaga-Del Castillo A
Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, 17012-901, Brazil.
Garib D
Department of Orthodontics, Bauru Dental School, University of São Paulo, Alameda Octávio Pinheiro Brisolla 9-75, Bauru, 17012-901, Brazil.
Lenza MA
Department of Orthodontics, Dental School, Federal University of Goiás, Goiania, Brazil.

MeSH

AdolescentBicuspidCephalometryChildFaceFemaleHumansMaleMalocclusion, Angle Class IIMandibleMaxillaRadiographyRetrospective StudiesTooth Extraction

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29199373

Citation

Janson, Guilherme, et al. "Dentoskeletal and Soft Tissue Changes in Class II Subdivision Treatment With Asymmetric Extraction Protocols." Progress in Orthodontics, vol. 18, no. 1, 2017, p. 39.
Janson G, Lenza EB, Francisco R, et al. Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols. Prog Orthod. 2017;18(1):39.
Janson, G., Lenza, E. B., Francisco, R., Aliaga-Del Castillo, A., Garib, D., & Lenza, M. A. (2017). Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols. Progress in Orthodontics, 18(1), 39. https://doi.org/10.1186/s40510-017-0193-x
Janson G, et al. Dentoskeletal and Soft Tissue Changes in Class II Subdivision Treatment With Asymmetric Extraction Protocols. Prog Orthod. 2017 Dec 4;18(1):39. PubMed PMID: 29199373.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols. AU - Janson,Guilherme, AU - Lenza,Eduardo Beaton, AU - Francisco,Rodolfo, AU - Aliaga-Del Castillo,Aron, AU - Garib,Daniela, AU - Lenza,Marcos Augusto, Y1 - 2017/12/04/ PY - 2017/07/19/received PY - 2017/09/29/accepted PY - 2017/12/5/entrez PY - 2017/12/5/pubmed PY - 2018/8/18/medline KW - Asymmetric extractions KW - Cephalometrics KW - Class II subdivision KW - Premolar extractions SP - 39 EP - 39 JF - Progress in orthodontics JO - Prog Orthod VL - 18 IS - 1 N2 - 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. SN - 2196-1042 UR - https://www.unboundmedicine.com/medline/citation/29199373/Dentoskeletal_and_soft_tissue_changes_in_class_II_subdivision_treatment_with_asymmetric_extraction_protocols_ DB - PRIME DP - Unbound Medicine ER -