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Conference Paper: Jaw Muscle Morphology at Jaw-opened Position in Skeletal Mandibular Asymmetry

TitleJaw Muscle Morphology at Jaw-opened Position in Skeletal Mandibular Asymmetry
Authors
KeywordsDiagnosis
Human
Magnetic Resonance Imaging
Radiology and TMJ and masticatory muscles
Issue Date2013
PublisherSage Publications, Inc.. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925
Citation
The 91st General Session & Exhibition of the International Association for Dental Research (IADR), Seattle, Washington, USA, 20-23 March 2014. In Journal of Dental Research, 2013, v. 92 n. Special issue A: abstract no. 3444 How to Cite?
AbstractObjective: The objective of this study was to investigate the size and orientation of the masticatory muscles at jaw-opened position in patients with mandibular asymmetry. We hypothesized the differences of muscle morphology between deviated side and non-deviated side of each patient would be smaller at jaw opened-position than those at jaw-closed position. Method: The study was carried out in 20 patients with skeletal mandibular asymmetry without congenital diseases: 10 females and 10 males (16‑28 yrs). The deviation between the midline of upper and lower incisors ranged from 3 to 11 mm at jaw closed-position. Controls were 10 participants: 5 females and 5 males (20‑30 yrs). Both side of the masseter (MS), medial (MP) and lateral pterygoid (LP) muscles were evaluated by three-dimensional volume data of MRI at jaw closed- and opened-positions. The contours of muscles were traced and were then reconstructed using imaging software, showing the individual jaw muscles in any desired plane. Maximum cross-sectional-area (CSA), length, and orientation were examined. It should be noted that CSAs were measured at an angle perpendicular to the actual muscle’s long axis. Lengths were investigated along the actual muscle’s long axis. To know the orientation of muslces, the frontal angles of MS and MP relative to the Frankfort horizontal plane; and axial angle of LP were measured. Result: CSAs and frontal angles significantly changed after jaw-opening both in patients and controls (p<0.0001-0.0038, paired t-test). At at jaw-closed position, length of MS, frontal angles of MS and MP showed differences between deviated side and non-deviated side (p<0.0001-0.0012). However, at jaw-opened position, difference was shown only on length of MS (p=0.002). Further, most parameters showed no significant difference between patients and controls (t-tests with Bonferroni). Conclusion: The morphology of masticatory muscles in patients tend to be less asymmetry and close to controls at jaw-opened position.
DescriptionPoster Presentation
Session 394: Motor Function and Motor Control
Persistent Identifierhttp://hdl.handle.net/10722/189660
ISSN
2015 Impact Factor: 4.602
2015 SCImago Journal Rankings: 1.714

 

DC FieldValueLanguage
dc.contributor.authorGoto, Ten_US
dc.date.accessioned2013-09-17T14:52:43Z-
dc.date.available2013-09-17T14:52:43Z-
dc.date.issued2013en_US
dc.identifier.citationThe 91st General Session & Exhibition of the International Association for Dental Research (IADR), Seattle, Washington, USA, 20-23 March 2014. In Journal of Dental Research, 2013, v. 92 n. Special issue A: abstract no. 3444en_US
dc.identifier.issn0022-0345-
dc.identifier.urihttp://hdl.handle.net/10722/189660-
dc.descriptionPoster Presentation-
dc.descriptionSession 394: Motor Function and Motor Control-
dc.description.abstractObjective: The objective of this study was to investigate the size and orientation of the masticatory muscles at jaw-opened position in patients with mandibular asymmetry. We hypothesized the differences of muscle morphology between deviated side and non-deviated side of each patient would be smaller at jaw opened-position than those at jaw-closed position. Method: The study was carried out in 20 patients with skeletal mandibular asymmetry without congenital diseases: 10 females and 10 males (16‑28 yrs). The deviation between the midline of upper and lower incisors ranged from 3 to 11 mm at jaw closed-position. Controls were 10 participants: 5 females and 5 males (20‑30 yrs). Both side of the masseter (MS), medial (MP) and lateral pterygoid (LP) muscles were evaluated by three-dimensional volume data of MRI at jaw closed- and opened-positions. The contours of muscles were traced and were then reconstructed using imaging software, showing the individual jaw muscles in any desired plane. Maximum cross-sectional-area (CSA), length, and orientation were examined. It should be noted that CSAs were measured at an angle perpendicular to the actual muscle’s long axis. Lengths were investigated along the actual muscle’s long axis. To know the orientation of muslces, the frontal angles of MS and MP relative to the Frankfort horizontal plane; and axial angle of LP were measured. Result: CSAs and frontal angles significantly changed after jaw-opening both in patients and controls (p<0.0001-0.0038, paired t-test). At at jaw-closed position, length of MS, frontal angles of MS and MP showed differences between deviated side and non-deviated side (p<0.0001-0.0012). However, at jaw-opened position, difference was shown only on length of MS (p=0.002). Further, most parameters showed no significant difference between patients and controls (t-tests with Bonferroni). Conclusion: The morphology of masticatory muscles in patients tend to be less asymmetry and close to controls at jaw-opened position.-
dc.languageengen_US
dc.publisherSage Publications, Inc.. The Journal's web site is located at http://www.sagepub.com/journalsProdDesc.nav?prodId=Journal201925-
dc.relation.ispartofJournal of Dental Researchen_US
dc.rightsJournal of Dental Research. Copyright © Sage Publications, Inc..-
dc.subjectDiagnosis-
dc.subjectHuman-
dc.subjectMagnetic Resonance Imaging-
dc.subjectRadiology and TMJ and masticatory muscles-
dc.titleJaw Muscle Morphology at Jaw-opened Position in Skeletal Mandibular Asymmetryen_US
dc.typeConference_Paperen_US
dc.identifier.emailGoto, T: gototk@hku.hken_US
dc.identifier.authorityGoto, T=rp01434en_US
dc.identifier.hkuros222770en_US
dc.identifier.volume92-
dc.identifier.issueSpecial issue A: abstract no. 3444-
dc.publisher.placeUnited States-

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