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Article: Effect of different advancement positions on the maximum retrusive force of the mandible

TitleEffect of different advancement positions on the maximum retrusive force of the mandible
Authors
KeywordsMandibular advancement
Muscle strength
Orthodontic appliances
Functional
Orthodontics
Issue Date2013
PublisherWiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1601-6335&site=1
Citation
Orthodontics & Craniofacial Research, 2013, v. 16 n. 1, p. 56-64 How to Cite?
AbstractINTRODUCTION: Functional appliances lead, in different degrees, to loss of anchorage in the lower arch. By anchoring them to the mandibular bone, any dental side effects may be avoided and the skeletal effect enhanced. Stability of bone-borne fixation would be affected by forces created by the pull of the masticatory muscles. We aimed to identify mean maximum forces produced by mandibular retrusive muscles, at different degrees of advancement. SUBJECTS AND METHODS: Eighteen healthy adult volunteers participated in the study. Maximum retrusive force was measured using a splint/load cell system. Readings of the maximum forces of retrusion were taken from five mandibular positions: unstrained retruded position, and 4, 5, 6, and 7 mm anterior to the unstrained position. Data were presented as means +/- SD and anova was performed to examine statistical significant differences between means of the maximum retrusion force. RESULTS: Mean maximum retrusion force ranged between 63.3 and 198.2 newtons at the unstrained and 7 mm positions, respectively. It increased as the distance of advancement increased, being statistically significantly (p < 0.05) less at unstrained position compared with all advancement distances, 4 mm of advancement than 6 and 7 mm advancement, 5 mm of advancement than at 7 mm advancement. CONCLUSION: Magnitude of the forces exerted by muscles during voluntary maximum retrusion movement from different advancement positions increased proportionately as the retrusion distance increased up to 7 mm. Such range of high forces might be important to consider when designing a bone-borne functional appliance.
Persistent Identifierhttp://hdl.handle.net/10722/177330
ISSN
2015 Impact Factor: 1.64
2015 SCImago Journal Rankings: 0.881
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorAl-kalaly, AAen_US
dc.contributor.authorDyson, JEen_US
dc.contributor.authorWong, RWKen_US
dc.contributor.authorSchatzle, Men_US
dc.contributor.authorCheung, LKen_US
dc.contributor.authorRabie, ABM-
dc.date.accessioned2012-12-18T05:01:08Z-
dc.date.available2012-12-18T05:01:08Z-
dc.date.issued2013en_US
dc.identifier.citationOrthodontics & Craniofacial Research, 2013, v. 16 n. 1, p. 56-64en_US
dc.identifier.issn1601-6335-
dc.identifier.urihttp://hdl.handle.net/10722/177330-
dc.description.abstractINTRODUCTION: Functional appliances lead, in different degrees, to loss of anchorage in the lower arch. By anchoring them to the mandibular bone, any dental side effects may be avoided and the skeletal effect enhanced. Stability of bone-borne fixation would be affected by forces created by the pull of the masticatory muscles. We aimed to identify mean maximum forces produced by mandibular retrusive muscles, at different degrees of advancement. SUBJECTS AND METHODS: Eighteen healthy adult volunteers participated in the study. Maximum retrusive force was measured using a splint/load cell system. Readings of the maximum forces of retrusion were taken from five mandibular positions: unstrained retruded position, and 4, 5, 6, and 7 mm anterior to the unstrained position. Data were presented as means +/- SD and anova was performed to examine statistical significant differences between means of the maximum retrusion force. RESULTS: Mean maximum retrusion force ranged between 63.3 and 198.2 newtons at the unstrained and 7 mm positions, respectively. It increased as the distance of advancement increased, being statistically significantly (p < 0.05) less at unstrained position compared with all advancement distances, 4 mm of advancement than 6 and 7 mm advancement, 5 mm of advancement than at 7 mm advancement. CONCLUSION: Magnitude of the forces exerted by muscles during voluntary maximum retrusion movement from different advancement positions increased proportionately as the retrusion distance increased up to 7 mm. Such range of high forces might be important to consider when designing a bone-borne functional appliance.-
dc.languageengen_US
dc.publisherWiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=1601-6335&site=1-
dc.relation.ispartofOrthodontics & Craniofacial Researchen_US
dc.rightsThe definitive version is available at www3.interscience.wiley.com-
dc.subjectMandibular advancement-
dc.subjectMuscle strength-
dc.subjectOrthodontic appliances-
dc.subjectFunctional-
dc.subjectOrthodontics-
dc.titleEffect of different advancement positions on the maximum retrusive force of the mandibleen_US
dc.typeArticleen_US
dc.identifier.emailDyson, JE: jdyson@hkucc.hku.hken_US
dc.identifier.emailWong, RWK: fyoung@hku.hken_US
dc.identifier.emailCheung, LK: lkcheung@hkucc.hku.hken_US
dc.identifier.emailRabie, ABM: rabie@hku.hk-
dc.identifier.authorityWong, RWK=rp00038en_US
dc.identifier.authorityCheung, LK=rp00013en_US
dc.identifier.authorityRabie, ABM=rp00029en_US
dc.identifier.doi10.1111/ocr.12004-
dc.identifier.pmid23311660-
dc.identifier.scopuseid_2-s2.0-84872397665-
dc.identifier.hkuros212645en_US
dc.identifier.volume16en_US
dc.identifier.issue1-
dc.identifier.spage56en_US
dc.identifier.epage64en_US
dc.identifier.isiWOS:000313726700006-
dc.publisher.placeUnited States-

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