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Article: Effect of head posture on cephalometric sagittal angular measures

TitleEffect of head posture on cephalometric sagittal angular measures
Authors
Issue Date1993
PublisherMosby, Inc. The Journal's web site is located at http://www.elsevier.com/locate/ajodo
Citation
American Journal Of Orthodontics And Dentofacial Orthopedics, 1993, v. 104 n. 4, p. 337-341 How to Cite?
AbstractThe definitions of cephalometric landmarks include relative terms that are dependent on the orientation of the head (e.g., lowest, most posterior) and head orientation differ widely during cephalometry (e.g., Frankfort plane horizontal, natural head posture). The purpose of this study was to quantify the effect of head posture changes on the commonly used sagittal angular measures SNA, SNB, and SNPogonion (SNPg). The sample comprised 30 Chinese skulls. Cephalograms were taken in a purpose designed skull holder with the Frankfort plane horizontal and at +10°, +20°, +30°, -10°, -20°, and -30°. A geometric grid was used to locate the deepest landmarks, and the landmarks were digitized followed by computer superimposition on the S-N line. To compare the values of the SNA, SNB, and SNPg angles in the different head postures, t tests were used. Head (skull) posture changes produced significant effects on the cephalometric values even, at ±10° of tilting. Overall, the angles were underestimated by approximately 1°. In general, the angular differences and their standard deviations increased as the skull rotation increased with most of the differences for the SNB and the SNPg angles being clinically significant and also statistically significant at the 0.1% level. It was concluded that head posture needs to be standardized during cephalometry. Changes in posture significantly affect the location of some landmarks and the subsequent data obtained. © 1993 American Association of Orthodontists.
Persistent Identifierhttp://hdl.handle.net/10722/153837
ISSN
2015 Impact Factor: 1.69
2015 SCImago Journal Rankings: 1.249
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTng, TTHen_US
dc.contributor.authorChan, TCKen_US
dc.contributor.authorCooke, MSen_US
dc.contributor.authorHägg, Uen_US
dc.date.accessioned2012-08-08T08:21:50Z-
dc.date.available2012-08-08T08:21:50Z-
dc.date.issued1993en_US
dc.identifier.citationAmerican Journal Of Orthodontics And Dentofacial Orthopedics, 1993, v. 104 n. 4, p. 337-341en_US
dc.identifier.issn0889-5406en_US
dc.identifier.urihttp://hdl.handle.net/10722/153837-
dc.description.abstractThe definitions of cephalometric landmarks include relative terms that are dependent on the orientation of the head (e.g., lowest, most posterior) and head orientation differ widely during cephalometry (e.g., Frankfort plane horizontal, natural head posture). The purpose of this study was to quantify the effect of head posture changes on the commonly used sagittal angular measures SNA, SNB, and SNPogonion (SNPg). The sample comprised 30 Chinese skulls. Cephalograms were taken in a purpose designed skull holder with the Frankfort plane horizontal and at +10°, +20°, +30°, -10°, -20°, and -30°. A geometric grid was used to locate the deepest landmarks, and the landmarks were digitized followed by computer superimposition on the S-N line. To compare the values of the SNA, SNB, and SNPg angles in the different head postures, t tests were used. Head (skull) posture changes produced significant effects on the cephalometric values even, at ±10° of tilting. Overall, the angles were underestimated by approximately 1°. In general, the angular differences and their standard deviations increased as the skull rotation increased with most of the differences for the SNB and the SNPg angles being clinically significant and also statistically significant at the 0.1% level. It was concluded that head posture needs to be standardized during cephalometry. Changes in posture significantly affect the location of some landmarks and the subsequent data obtained. © 1993 American Association of Orthodontists.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 Orthopedicsen_US
dc.subject.meshAsian Continental Ancestry Groupen_US
dc.subject.meshCephalometry - Methodsen_US
dc.subject.meshChinaen_US
dc.subject.meshHeaden_US
dc.subject.meshHumansen_US
dc.subject.meshPostureen_US
dc.subject.meshReproducibility Of Resultsen_US
dc.titleEffect of head posture on cephalometric sagittal angular measuresen_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.pmid8213654-
dc.identifier.scopuseid_2-s2.0-0027685757en_US
dc.identifier.volume104en_US
dc.identifier.issue4en_US
dc.identifier.spage337en_US
dc.identifier.epage341en_US
dc.identifier.isiWOS:A1993MC62700009-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridTng, TTH=6507663848en_US
dc.identifier.scopusauthoridChan, TCK=7402687561en_US
dc.identifier.scopusauthoridCooke, MS=7202147454en_US
dc.identifier.scopusauthoridHägg, U=7006790279en_US

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