Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population
The aim of this study was to evaluate the change in mandibular position during a two-phase orthodontic treatment of skeletal Class II malocclusion. Thirty consecutively treated Chinese male adolescents who had undergone two-phase treatment with Herbst appliance and fixed appliance and fulfilled the...
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| Language: | English |
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Wiley
2015-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2015/804831 |
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| author | Rhonda Nga Yi Cheung Urban Hägg Ricky Wing Kit Wong Chongshan Liao Yanqi Yang |
| author_facet | Rhonda Nga Yi Cheung Urban Hägg Ricky Wing Kit Wong Chongshan Liao Yanqi Yang |
| author_sort | Rhonda Nga Yi Cheung |
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| description | The aim of this study was to evaluate the change in mandibular position during a two-phase orthodontic treatment of skeletal Class II malocclusion. Thirty consecutively treated Chinese male adolescents who had undergone two-phase treatment with Herbst appliance and fixed appliance and fulfilled the specific selection criteria were sampled. Cephalograms taken at T0 (before treatment), T1 (at the end of functional appliance treatment), and T2 (at the end of fixed appliance treatment) were analyzed. The change in sagittal positioning of the mandible was 6.8±3.44 mm in phase I (T0-T1), 0.4±2.79 mm in phase II (T1-T2), and 7.2±4.61 mm in total. The mandible came forward in 100% of the patients at T1. In phase II, it came forward in one-third (positive group) remained unchanged in one-third (stable group) and went backward in one-third (negative group) of the patients. At T2, it came forward twice as much in the positive group compared to the negative group. Mandibular length was significantly increased in 100% of the patients in both phases. In conclusion, during the treatment with functional appliance, the mandibular prognathism increases in all patients, whereas during the treatment with fixed appliance there is no significant change in mandibular prognathism. |
| format | Article |
| id | doaj-art-942c36e21df341bab0f56d28e22976ef |
| institution | OA Journals |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2015-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-942c36e21df341bab0f56d28e22976ef2025-08-20T02:09:47ZengWileyThe Scientific World Journal2356-61401537-744X2015-01-01201510.1155/2015/804831804831Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese PopulationRhonda Nga Yi Cheung0Urban Hägg1Ricky Wing Kit Wong2Chongshan Liao3Yanqi Yang4Orthodontics, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Sai Ying Pun, Hong KongOrthodontics, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Sai Ying Pun, Hong KongDepartment of Dentistry & Maxillofacial, United Christian Hospital, Kowloon, Hong KongOrthodontics, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Sai Ying Pun, Hong KongOrthodontics, Faculty of Dentistry, The University of Hong Kong, 34 Hospital Road, Sai Ying Pun, Hong KongThe aim of this study was to evaluate the change in mandibular position during a two-phase orthodontic treatment of skeletal Class II malocclusion. Thirty consecutively treated Chinese male adolescents who had undergone two-phase treatment with Herbst appliance and fixed appliance and fulfilled the specific selection criteria were sampled. Cephalograms taken at T0 (before treatment), T1 (at the end of functional appliance treatment), and T2 (at the end of fixed appliance treatment) were analyzed. The change in sagittal positioning of the mandible was 6.8±3.44 mm in phase I (T0-T1), 0.4±2.79 mm in phase II (T1-T2), and 7.2±4.61 mm in total. The mandible came forward in 100% of the patients at T1. In phase II, it came forward in one-third (positive group) remained unchanged in one-third (stable group) and went backward in one-third (negative group) of the patients. At T2, it came forward twice as much in the positive group compared to the negative group. Mandibular length was significantly increased in 100% of the patients in both phases. In conclusion, during the treatment with functional appliance, the mandibular prognathism increases in all patients, whereas during the treatment with fixed appliance there is no significant change in mandibular prognathism.http://dx.doi.org/10.1155/2015/804831 |
| spellingShingle | Rhonda Nga Yi Cheung Urban Hägg Ricky Wing Kit Wong Chongshan Liao Yanqi Yang Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population The Scientific World Journal |
| title | Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population |
| title_full | Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population |
| title_fullStr | Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population |
| title_full_unstemmed | Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population |
| title_short | Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population |
| title_sort | change of mandibular position during two phase orthodontic treatment of skeletal class ii in the chinese population |
| url | http://dx.doi.org/10.1155/2015/804831 |
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