Medicine, Dentistry & Health Sciences Collected Works - Theses

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    Premolar extraction and non-extraction : effects on buccal corridor widths and areas and frontal facial attractiveness
    Meyer, Anna Ho. (University of Melbourne, 2011)
    AIMS: This retrospective study was designed to compare and examine the pre-treatment and post-treatment arch widths and buccal corridor changes in subjects who had received orthodontic treatment either with or without four premolar extractions. The influence that the buccal corridor might have on the frontal facial attractiveness of these subjects was also assessed. MATERIALS AND METHODS: Pre-treatment and post-treatment casts, frontal smiling photographs and lateral cephalograms of 30 premolar extraction and 27 nonextraction patients were analysed to determine any significant differences in the arch width, anterior and posterior bucco-palatal inclinations of the teeth and buccal corridor widths and areas; both within and between the two study groups. Relationships between the buccal corridor measurements and the corresponding the arch widths and bucco-palatal inclinations of teeth were also examined. The post-treatment full-faced frontal smiling photographs of this sample were then evaluated in random order by 20 orthodontists, 20 dentists and 20 laypeople using a visual analogue scale (VAS). The ratings were analysed according to rater group, rater gender and number of years in practice for orthodontists and dentists to search for any statistically significant differences in the ratings on the basis of treatment groups, subject gender or buccal corridor widths and areas. RESULTS: There was a significant increase in the post-treatment maxillary inter-canine width seen in the extraction group but not in the non-extraction group. When measured at a constant arch depth in relation to the rugae, there was a significant increase in anterior arch width in the non-extraction group, but not in the extraction group. There were no significant differences in any of the buccal corridor widths or areas measured between extraction and nonextraction subjects. Consistent positive correlations were found between the measured buccal corridor width with reference to the last visible maxillary teeth with several pretreatment and post-treatment arch widths. There was a positive correlation between the post-treatment canine inclinations and the corresponding buccal corridor widths. Orthodontists and dentists gave higher mean overall frontal facial attractiveness scores than laypeople. There were no significant differences in the subject ratings of males and females raters. The number of years in practice did not seem to affect the way in which orthodontists were rating, but it did affect the ratings of dentists. Female subjects were consistently rated as being significantly more attractive than male subjects. There was no difference in ratings for extraction and non-extraction subject groups. The buccal corridor widths and areas did not affect frontal facial attractiveness ratings. CONCLUSIONS: There are likely to be significant differences in average upper anterior and posterior posttreatment arch widths in those treated either with or without premolar extractions. However, these arch width differences are not likely to be discernable in extraction and non-extraction subjects in relation to the buccal corridor widths and areas. Although there is a relationship between arch widths and buccal corridor widths when measured in relation to the last visible maxillary teeth, neither the choice of extraction or non-extraction treatment, nor the buccal corridor widths or areas appear to affect the frontal facial attractiveness of subjects.
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    Studies of balance in older people
    Hill, Keith, Ph. D. (University of Melbourne, 1997)
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    Genetic strategies to improve islet graft function
    Mysore, Tharun Bharath. (University of Melbourne, 2010)
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    Biomarkers in diabetic retinopathy : genetic and proteomic profiling
    McAuley, Annie K. (University of Melbourne, 2014)
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    Health economics, simulation modelling and Type 1 diabetes mellitus
    Lung, Thomas Wai-Chun (University of Melbourne, 2015)
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    Animal models of inherited human epilepsies
    Chiu, Cindy Hsin-Yi. (University of Melbourne, 2008)
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