Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols
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 di...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2017-12-01
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| Series: | Progress in Orthodontics |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s40510-017-0193-x |
| _version_ | 1819069184165806080 |
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| author | Guilherme Janson Eduardo Beaton Lenza Rodolfo Francisco Aron Aliaga-Del Castillo Daniela Garib Marcos Augusto Lenza |
| author_facet | Guilherme Janson Eduardo Beaton Lenza Rodolfo Francisco Aron Aliaga-Del Castillo Daniela Garib Marcos Augusto Lenza |
| author_sort | Guilherme Janson |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-21T16:46:00Z |
| format | Article |
| id | doaj.art-777621f4431449f29b5431265a4b5008 |
| institution | Directory Open Access Journal |
| issn | 2196-1042 |
| language | English |
| last_indexed | 2024-12-21T16:46:00Z |
| publishDate | 2017-12-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Progress in Orthodontics |
| spelling | doaj.art-777621f4431449f29b5431265a4b50082022-12-21T18:56:59ZengSpringerOpenProgress in Orthodontics2196-10422017-12-0118111010.1186/s40510-017-0193-xDentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocolsGuilherme Janson0Eduardo Beaton Lenza1Rodolfo Francisco2Aron Aliaga-Del Castillo3Daniela Garib4Marcos Augusto Lenza5Department of Orthodontics, Bauru Dental School, University of São PauloDepartment of Orthodontics, Bauru Dental School, University of São PauloDepartment of Orthodontics, Bauru Dental School, University of São PauloDepartment of Orthodontics, Bauru Dental School, University of São PauloDepartment of Orthodontics, Bauru Dental School, University of São PauloDepartment of Orthodontics, Dental School, Federal University of GoiásAbstract 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.http://link.springer.com/article/10.1186/s40510-017-0193-xClass II subdivisionPremolar extractionsAsymmetric extractionsCephalometrics |
| spellingShingle | Guilherme Janson Eduardo Beaton Lenza Rodolfo Francisco Aron Aliaga-Del Castillo Daniela Garib Marcos Augusto Lenza Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols Progress in Orthodontics Class II subdivision Premolar extractions Asymmetric extractions Cephalometrics |
| title | Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols |
| title_full | Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols |
| title_fullStr | Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols |
| title_full_unstemmed | Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols |
| title_short | Dentoskeletal and soft tissue changes in class II subdivision treatment with asymmetric extraction protocols |
| title_sort | dentoskeletal and soft tissue changes in class ii subdivision treatment with asymmetric extraction protocols |
| topic | Class II subdivision Premolar extractions Asymmetric extractions Cephalometrics |
| url | http://link.springer.com/article/10.1186/s40510-017-0193-x |
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