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Article: Effects of cephalometric landmark validity on incisor angulation

TitleEffects of cephalometric landmark validity on incisor angulation
Authors
Issue Date1994
PublisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodo
Citation
American Journal Of Orthodontics And Dentofacial Orthopedics, 1994, v. 106 n. 5, p. 487-495 How to Cite?
AbstractAn experimental cephalometric study on the accuracy of independently locating eight landmarks and the subsequent effects on the maxillary (ILs/NL) and mandibular (ILi/ML) incisor angulation was carried out on 30 dry skulls. The true location of each landmark was marked with a steel ball glued onto the skulls. Two additional steel balls were used as reference markers. A purpose-designed skullholder was made to assure a firm and reproducible positioning of the skulls in the cephalostat. Six series of cephalograms were recorded. One reference series with all the steel balls, four series each with a single steel ball marker removed, one at a time, from each jaw and one series with all the steel ball markers removed, except the reference markers. The combined method error in relocating and replacing the steel ball markers, repositioning the skulls into the skull holder, and digitizing, was low. From the first series, the true position of the palane (NL), the maxillary incisor line (ILs), the mandibular plane (ML) and the mandibular incisor line (ILi) were assessed. From series 2 to 5, each of the landmarks without the steel ball markers was estimated. The accuracy of each landmark was then assessed relative to the true cephalometric plane and its perpendicular. On average, the accuracy was high for all the landmarks except posterior nasal spine (PNS), which was estimated 1.2 mm too far anteriorly (p<0.05). The standard deviations of the accuracy of the dental and skeletal landmarks were similar, being 1.4 to 2.4 mm. The maxillary incisors were proclined 1.1° (p<0.05) by the estimates of incision superior (ls). The mandibular incisors were retroclined 0.3° (p<0.05) by gonioin, 1.0° (p<0.01) by menton, and 1.1° (p<0.05) by apex inferior. The standard deviations of the incisor angulations were low (0.6°) both for ANS and gonion, moderate for PNS (1.3°) and menton (1.0°), and high for the dental landmarks (1.8° to 2.8°). © 1994 American Association of Orthodontists.
Persistent Identifierhttp://hdl.handle.net/10722/88181
ISSN
2015 Impact Factor: 1.69
2015 SCImago Journal Rankings: 1.249
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChan, CKen_HK
dc.contributor.authorTng, THen_HK
dc.contributor.authorHägg, Uen_HK
dc.contributor.authorCooke, MSen_HK
dc.date.accessioned2010-09-06T09:39:53Z-
dc.date.available2010-09-06T09:39:53Z-
dc.date.issued1994en_HK
dc.identifier.citationAmerican Journal Of Orthodontics And Dentofacial Orthopedics, 1994, v. 106 n. 5, p. 487-495en_HK
dc.identifier.issn0889-5406en_HK
dc.identifier.urihttp://hdl.handle.net/10722/88181-
dc.description.abstractAn experimental cephalometric study on the accuracy of independently locating eight landmarks and the subsequent effects on the maxillary (ILs/NL) and mandibular (ILi/ML) incisor angulation was carried out on 30 dry skulls. The true location of each landmark was marked with a steel ball glued onto the skulls. Two additional steel balls were used as reference markers. A purpose-designed skullholder was made to assure a firm and reproducible positioning of the skulls in the cephalostat. Six series of cephalograms were recorded. One reference series with all the steel balls, four series each with a single steel ball marker removed, one at a time, from each jaw and one series with all the steel ball markers removed, except the reference markers. The combined method error in relocating and replacing the steel ball markers, repositioning the skulls into the skull holder, and digitizing, was low. From the first series, the true position of the palane (NL), the maxillary incisor line (ILs), the mandibular plane (ML) and the mandibular incisor line (ILi) were assessed. From series 2 to 5, each of the landmarks without the steel ball markers was estimated. The accuracy of each landmark was then assessed relative to the true cephalometric plane and its perpendicular. On average, the accuracy was high for all the landmarks except posterior nasal spine (PNS), which was estimated 1.2 mm too far anteriorly (p<0.05). The standard deviations of the accuracy of the dental and skeletal landmarks were similar, being 1.4 to 2.4 mm. The maxillary incisors were proclined 1.1° (p<0.05) by the estimates of incision superior (ls). The mandibular incisors were retroclined 0.3° (p<0.05) by gonioin, 1.0° (p<0.01) by menton, and 1.1° (p<0.05) by apex inferior. The standard deviations of the incisor angulations were low (0.6°) both for ANS and gonion, moderate for PNS (1.3°) and menton (1.0°), and high for the dental landmarks (1.8° to 2.8°). © 1994 American Association of Orthodontists.en_HK
dc.languageengen_HK
dc.publisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodoen_HK
dc.relation.ispartofAmerican Journal of Orthodontics and Dentofacial Orthopedicsen_HK
dc.subject.meshAdulten_HK
dc.subject.meshCephalometry - standardsen_HK
dc.subject.meshHumansen_HK
dc.subject.meshIncisor - radiographyen_HK
dc.subject.meshMiddle Ageden_HK
dc.subject.meshObserver Variationen_HK
dc.subject.meshRadiographic Image Enhancement - standardsen_HK
dc.subject.meshReference Standardsen_HK
dc.subject.meshReproducibility of Resultsen_HK
dc.titleEffects of cephalometric landmark validity on incisor angulationen_HK
dc.typeArticleen_HK
dc.identifier.emailHägg, U:euohagg@hkusua.hku.hken_HK
dc.identifier.authorityHägg, U=rp00020en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.pmid7977189en_HK
dc.identifier.scopuseid_2-s2.0-0028535438en_HK
dc.identifier.hkuros5136en_HK
dc.identifier.volume106en_HK
dc.identifier.issue5en_HK
dc.identifier.spage487en_HK
dc.identifier.epage495en_HK
dc.identifier.isiWOS:A1994PR32300008-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridChan, CK=7404814370en_HK
dc.identifier.scopusauthoridTng, TH=6507663846en_HK
dc.identifier.scopusauthoridHägg, U=7006790279en_HK
dc.identifier.scopusauthoridCooke, MS=7202147454en_HK

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