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Article: Agenesis of mandibular second premolars. Spontaneous space closure after extraction therapy: A 4-year follow-up

TitleAgenesis of mandibular second premolars. Spontaneous space closure after extraction therapy: A 4-year follow-up
Authors
Issue Date1996
PublisherOxford University Press. The Journal's web site is located at http://ejo.oxfordjournals.org/
Citation
European Journal Of Orthodontics, 1996, v. 18 n. 6, p. 589-600 How to Cite?
AbstractThe aim of this study was to investigate the space closure and occlusal changes in 11 subjects (mean age 11.8 years) with normal occlusion and agenesis of the mandibular second premolar, after extraction of the mandibular second primary molar and the maxillary second premolar on the side of the agenesis. The treatment started when the first premolars came into occlusion and the subjects were followed for 4 years. Dental casts were taken at the start of treatment and after 1, 2 and 4 years, and lateral cephalograms were taken at the start of treatment and after 2 and 4 years. Space closure, sagittal movements, rotational movements, and tipping of the first molars and first premolars and dental midline shift were measured on photographs of dental casts. Sagittal movement of the incisors was measured on lateral cephalograms. The results showed that most of the extraction space closed during the first year (55 per cent in the maxilla, 46 per cent in the mandible) and at the end of the follow-up period 89 per cent of the extraction space closed in the maxilla and 80 per cent in the mandible, leaving a mean residual extraction space of 0.9 and 2 mm respectively. In the maxilla, 70 per cent of the extraction space closed by mesial and rotational movements of the first molars. Maxillary premolars moved distally, rotated and tipped only during the first year of observation. In the mandible, the space closure occurred by mesial/rotational movements and tipping of first molars and distal movement and tipping of the first premolars. Unilateral extraction had no influence on the maxillary midline while it caused a statistically significant mandibular dental shift to the extraction side. Extraction therapy had no impact on the overjet, overbite or incisor inclination.
Persistent Identifierhttp://hdl.handle.net/10722/48920
ISSN
2015 Impact Factor: 1.44
2015 SCImago Journal Rankings: 1.090
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMamopoulou, Aen_HK
dc.contributor.authorHägg, Uen_HK
dc.contributor.authorSchröder, Uen_HK
dc.contributor.authorHansen, Ken_HK
dc.date.accessioned2008-06-12T06:29:43Z-
dc.date.available2008-06-12T06:29:43Z-
dc.date.issued1996en_HK
dc.identifier.citationEuropean Journal Of Orthodontics, 1996, v. 18 n. 6, p. 589-600en_HK
dc.identifier.issn0141-5387en_HK
dc.identifier.urihttp://hdl.handle.net/10722/48920-
dc.description.abstractThe aim of this study was to investigate the space closure and occlusal changes in 11 subjects (mean age 11.8 years) with normal occlusion and agenesis of the mandibular second premolar, after extraction of the mandibular second primary molar and the maxillary second premolar on the side of the agenesis. The treatment started when the first premolars came into occlusion and the subjects were followed for 4 years. Dental casts were taken at the start of treatment and after 1, 2 and 4 years, and lateral cephalograms were taken at the start of treatment and after 2 and 4 years. Space closure, sagittal movements, rotational movements, and tipping of the first molars and first premolars and dental midline shift were measured on photographs of dental casts. Sagittal movement of the incisors was measured on lateral cephalograms. The results showed that most of the extraction space closed during the first year (55 per cent in the maxilla, 46 per cent in the mandible) and at the end of the follow-up period 89 per cent of the extraction space closed in the maxilla and 80 per cent in the mandible, leaving a mean residual extraction space of 0.9 and 2 mm respectively. In the maxilla, 70 per cent of the extraction space closed by mesial and rotational movements of the first molars. Maxillary premolars moved distally, rotated and tipped only during the first year of observation. In the mandible, the space closure occurred by mesial/rotational movements and tipping of first molars and distal movement and tipping of the first premolars. Unilateral extraction had no influence on the maxillary midline while it caused a statistically significant mandibular dental shift to the extraction side. Extraction therapy had no impact on the overjet, overbite or incisor inclination.en_HK
dc.format.extent418 bytes-
dc.format.mimetypetext/html-
dc.languageengen_HK
dc.publisherOxford University Press. The Journal's web site is located at http://ejo.oxfordjournals.org/en_HK
dc.relation.ispartofEuropean Journal of Orthodonticsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subject.meshAnodontia - therapyen_HK
dc.subject.meshBicuspid - abnormalitiesen_HK
dc.subject.meshDiastema - therapyen_HK
dc.subject.meshMolar - surgeryen_HK
dc.subject.meshTooth Extractionen_HK
dc.titleAgenesis of mandibular second premolars. Spontaneous space closure after extraction therapy: A 4-year follow-upen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0141-5387&volume=18&issue=6&spage=589&epage=600&date=1996&atitle=Agenesis+of+mandibular+second+premolars.++Spontaneous+space+closure+after+extraction+therapy:+a+4-year+follow-upen_HK
dc.identifier.emailHägg, U:euohagg@hkusua.hku.hken_HK
dc.identifier.authorityHägg, U=rp00020en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1093/ejo/18.1.589en_HK
dc.identifier.pmid9009423-
dc.identifier.scopuseid_2-s2.0-0030333742en_HK
dc.identifier.hkuros21836-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030333742&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume18en_HK
dc.identifier.issue6en_HK
dc.identifier.spage589en_HK
dc.identifier.epage600en_HK
dc.identifier.isiWOS:A1996WC23100005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridMamopoulou, A=6506998303en_HK
dc.identifier.scopusauthoridHägg, U=7006790279en_HK
dc.identifier.scopusauthoridSchröder, U=7103107272en_HK
dc.identifier.scopusauthoridHansen, K=7401918543en_HK

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