Show simple item record

dc.contributor.advisorFarella, Mauro
dc.contributor.advisorKieser, Jules
dc.contributor.authorKhayami, Shahrzad
dc.date.available2014-10-24T00:16:44Z
dc.date.copyright2014
dc.identifier.citationKhayami, S. (2014). The effect of occlusal vertical dimension on swallowing pattern (Thesis, Doctor of Clinical Dentistry). University of Otago. Retrieved from http://hdl.handle.net/10523/5065en
dc.identifier.urihttp://hdl.handle.net/10523/5065
dc.description.abstractAim: To determine the effect of an acute change in occlusal vertical dimension (OVD) on tongue and lip pressure during swallowing. Methods: Five male and five female volunteers (27-32 years) participated in this research. Intra-oral transducers were used to assess tongue and lip pressure, whereas surface electromyographic (EMG) electrodes were used to assess perioral muscle activity. The OVD was progressively increased using vacuum-formed trays of differing heights. Standardised swallowing tasks were performed repetitively with each tray in place. Individual swallowing waveforms were qualitatively and quantitatively analysed. Mean peak pressure, time to peak pressure, swallow duration and lip EMG peak activity were assessed for each swallow. Data were analysed using mixed-model analysis. Results: Swallowing waveforms varied markedly between-individuals, but within each individual, their shape was minimally affected by changes in OVD. When OVD was increased, swallow duration increased by 12.7 percent (160ms; p = 0.01). Upper lip peak pressure increased by 63.8 percent (p ≤ 0.001) and intraoral peak pressure increased by 12.0 percent (p = 0.001) When OVD was increased, perioral muscle activity during swallows increased by 43.7 percent (p ≤ 0.01) up to the OVD where resting lip seal was not attainable. Conclusion: An acute increase of OVD produces swallowing episodes that are slightly stronger and longer than those recorded at the habitual OVD. The waveforms of the swallows, however, remain remarkably similar. The adaptive response and the waveform similarities associated with OVD variation supports the existence of both peripheral and central mechanisms to control swallowing.
dc.language.isoen
dc.publisherUniversity of Otago
dc.rightsAll items in OUR Archive are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectvertical
dc.subjectdimension
dc.subjectanterior
dc.subjectopen
dc.subjectbite
dc.subjectmalocclusion
dc.subjectswallowing
dc.subjectwaveform
dc.subjectequilibrium
dc.subjectelectromyography
dc.subjectpressure
dc.subjecttransducer
dc.subjectorthodontic
dc.subjectocclusal
dc.subjectocclusion
dc.subjectperipheral
dc.subjectcentral
dc.titleThe effect of occlusal vertical dimension on swallowing pattern
dc.typeThesis
dc.date.updated2014-10-23T23:30:48Z
dc.language.rfc3066en
thesis.degree.disciplineOral Sciences - Orthodontics
thesis.degree.nameDoctor of Clinical Dentistry
thesis.degree.grantorUniversity of Otago
thesis.degree.levelDoctoral
otago.interloanyes
otago.openaccessAbstract Only
 Find in your library

Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item is not available in full-text via OUR Archive.

If you would like to read this item, please apply for an inter-library loan from the University of Otago via your local library.

If you are the author of this item, please contact us if you wish to discuss making the full text publicly available.

This item appears in the following Collection(s)

Show simple item record