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dc.contributor.author Goldade, Kent Douglas en_US
dc.date.accessioned 2007-05-15T15:18:27Z
dc.date.available 2007-05-15T15:18:27Z
dc.date.issued 1997-05-01T00:00:00Z en_US
dc.identifier.uri http://hdl.handle.net/1993/831
dc.description.abstract Differences in the physical characteristics of the lips of different individuals could account for differences in the lip response to tooth movement between individuals. This study was designed to address this possibility. The hypothesis tested was that lip profile changes in response to orthodontic tooth movement are not predictably associated with the physical properties of the upper lip measured during simulated tooth movement. This laboratory and cephalometric study involved seven adult subjects whose maxillary incisors were retracted during previous treatment at the University of Manitoba. An experimental apparatus was constructed to record the forces associated with the displacement of the relaxed upper lip. The physical properties of the upper lip were quantified by the slope of the stress:strain and horizontal flange displacement:horizontal lip displacement (flange$\sp{\rm H}$:lip$\sp{\rm H})$ linear regression relationships, as determined using the video data. The area of tooth retraction (ATR) was determined by superimposing pre- and post-treatment occlusograms. Regression analysis showed a high level of statistical significance for both the stress:strain and flange$\sp{\rm H}$:lip$\sp{\rm H}$ relationships (p $<$ 0.001), but these relationships were not found to be related. Both prediction models had a strong correlation to the cephalometric results (r = 0.95), with the most important variable being the ATR. (Abstract shortened by UMI.) en_US
dc.format.extent 8927338 bytes
dc.format.extent 184 bytes
dc.format.mimetype application/pdf
dc.format.mimetype text/plain
dc.language en en_US
dc.language.iso en_US
dc.title Physical properties of the upper lip measured during simulated tooth movement en_US
dc.degree.discipline Dental Diagnostic and Surgical Sciences
dc.degree.level Master of Science (M.Sc.) en_US


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