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Article: Overjet reduction and molar correction in fixed appliance treatment of class II, division 1, malocclusions: sagittal and vertical components.

TitleOverjet reduction and molar correction in fixed appliance treatment of class II, division 1, malocclusions: sagittal and vertical components.
Authors
Issue Date1999
PublisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodo
Citation
American Journal Of Orthodontics And Dentofacial Orthopedics : Official Publication Of The American Association Of Orthodontists, Its Constituent Societies, And The American Board Of Orthodontics, 1999, v. 115 n. 1, p. 13-23 How to Cite?
AbstractThe purpose of this study was to quantitatively evaluate skeletal and dental changes contributing to Class II correction in patients treated with the Begg technique. The sample consisted of 18 male subjects with Class II, division 1, malocclusions treated with fixed appliances (Begg technique, nonextraction) for an average period of 1.3 years (standard deviation, 0.24 years). Lateral radiographs in habitual occlusion taken at 6 months before the start of treatment, at the start of treatment, and 6, 12, and 18 months after the start of treatment were analyzed. During the control period, normal sagittal and vertical growth changes occurred. In the initial treatment period (0 to 6 months), the overjet reduction (6.6 mm; P <. 001) and the molar correction (2.2 mm; P <.001) were obtained mainly by dental movements. The overbite was reduced by 4.1 mm (P <.001). The NSL/ML and NL/ML angles increased by 1.5 degrees (P <.05) and 1. 4 degrees (P <.01), respectively, and the anterior lower facial height increased by 3.1 mm (P <.001). During the second period of treatment (6 to 12 months), the molar correction continued to improve, and the anterior lower facial height continued to increase. During the third period (12 to 18 months), a small relapse in overjet and overbite was noted, but the anterior lower facial height continued to increase. During the total treatment period (0 to 18 months), the overjet reduction and molar correction were 5.8 mm (P <. 001) and 3.0 mm (P <.001), respectively. Mandibular growth exceeded maxillary growth by 1.1 mm (P <.01). The overbite correction and the increase in anterior lower facial height were 3.0 mm (P <.001) and 5. 0 mm (P <.001), respectively. The NSL/ML angle increased 1.0 degrees (P <.05). The conclusions were that the changes contributing to the Class II correction were mostly dental. Vertically, the net effects of treatment were an increase in the mandibular plane angle and in lower anterior facial height.
Persistent Identifierhttp://hdl.handle.net/10722/154052
ISSN
2015 Impact Factor: 1.69
2015 SCImago Journal Rankings: 1.249
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorNelson, Ben_US
dc.contributor.authorHansen, Ken_US
dc.contributor.authorHägg, Uen_US
dc.date.accessioned2012-08-08T08:23:01Z-
dc.date.available2012-08-08T08:23:01Z-
dc.date.issued1999en_US
dc.identifier.citationAmerican Journal Of Orthodontics And Dentofacial Orthopedics : Official Publication Of The American Association Of Orthodontists, Its Constituent Societies, And The American Board Of Orthodontics, 1999, v. 115 n. 1, p. 13-23en_US
dc.identifier.issn0889-5406en_US
dc.identifier.urihttp://hdl.handle.net/10722/154052-
dc.description.abstractThe purpose of this study was to quantitatively evaluate skeletal and dental changes contributing to Class II correction in patients treated with the Begg technique. The sample consisted of 18 male subjects with Class II, division 1, malocclusions treated with fixed appliances (Begg technique, nonextraction) for an average period of 1.3 years (standard deviation, 0.24 years). Lateral radiographs in habitual occlusion taken at 6 months before the start of treatment, at the start of treatment, and 6, 12, and 18 months after the start of treatment were analyzed. During the control period, normal sagittal and vertical growth changes occurred. In the initial treatment period (0 to 6 months), the overjet reduction (6.6 mm; P <. 001) and the molar correction (2.2 mm; P <.001) were obtained mainly by dental movements. The overbite was reduced by 4.1 mm (P <.001). The NSL/ML and NL/ML angles increased by 1.5 degrees (P <.05) and 1. 4 degrees (P <.01), respectively, and the anterior lower facial height increased by 3.1 mm (P <.001). During the second period of treatment (6 to 12 months), the molar correction continued to improve, and the anterior lower facial height continued to increase. During the third period (12 to 18 months), a small relapse in overjet and overbite was noted, but the anterior lower facial height continued to increase. During the total treatment period (0 to 18 months), the overjet reduction and molar correction were 5.8 mm (P <. 001) and 3.0 mm (P <.001), respectively. Mandibular growth exceeded maxillary growth by 1.1 mm (P <.01). The overbite correction and the increase in anterior lower facial height were 3.0 mm (P <.001) and 5. 0 mm (P <.001), respectively. The NSL/ML angle increased 1.0 degrees (P <.05). The conclusions were that the changes contributing to the Class II correction were mostly dental. Vertically, the net effects of treatment were an increase in the mandibular plane angle and in lower anterior facial height.en_US
dc.languageengen_US
dc.publisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodoen_US
dc.relation.ispartofAmerican journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodonticsen_US
dc.rightsAmerican Journal of Orthodontics and Dentofacial Orthopedics. Copyright © Mosby, Inc.-
dc.subject.meshAdolescenten_US
dc.subject.meshCephalometryen_US
dc.subject.meshChilden_US
dc.subject.meshHumansen_US
dc.subject.meshMaleen_US
dc.subject.meshMalocclusion, Angle Class Ii - Physiopathology - Therapyen_US
dc.subject.meshMatched-Pair Analysisen_US
dc.subject.meshMaxillofacial Developmenten_US
dc.subject.meshOrthodontic Appliancesen_US
dc.subject.meshOrthodontics, Corrective - Methodsen_US
dc.subject.meshOutcome Assessment (Health Care)en_US
dc.subject.meshProspective Studiesen_US
dc.subject.meshStatistics, Nonparametricen_US
dc.subject.meshVertical Dimensionen_US
dc.titleOverjet reduction and molar correction in fixed appliance treatment of class II, division 1, malocclusions: sagittal and vertical components.en_US
dc.typeArticleen_US
dc.identifier.emailHägg, U:euohagg@hkusua.hku.hken_US
dc.identifier.authorityHägg, U=rp00020en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0889-5406(99)70311-2-
dc.identifier.pmid9878953-
dc.identifier.scopuseid_2-s2.0-0032620458en_US
dc.identifier.hkuros39476-
dc.identifier.volume115en_US
dc.identifier.issue1en_US
dc.identifier.spage13en_US
dc.identifier.epage23en_US
dc.identifier.isiWOS:000078018700004-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridNelson, B=7402428326en_US
dc.identifier.scopusauthoridHansen, K=7401918543en_US
dc.identifier.scopusauthoridHägg, U=7006790279en_US

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