Yazdanie, Nazia; (1990) Responses of partially edentulous subjects to variations in denture forms as determined by intra-oral force measurements. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

The purpose of this investigation was to study patients' responses to changes in denture forms as determined by intra oral force measurements. A group of subjects was selected requiring treatment with complete upper and partial lower Kennedy class 1 dentures. In addition to recording medical and dental histories, tests of oral stereognostic and motor ability were employed, together with a Clinical Interview Schedule, so as to exclude those with characteristics reported as reducing oral adaptability. An impression procedure was evolved, assessed and used to record the neutral zone in the test subjects. A complete upper and two lower dentures were made, the second being the test prosthesis. Its flanges were initially contoured to fill the neutral zone, and it was capable of being altered both buccally and lingually to fill more of the available space in the mouth. A miniature force transducer was developed, such that eight devices could be inserted into the test prosthesis to record simultaneously forces on the anterior and posterior aspects of the buccal and lingual flanges with a computer-based system. A regimen of tests was developed to examine the forces exerted on the varied shapes of the denture. The magnitude and the nature of the forces were analysed in relation to activity, location, head-angulation, time-interval and thickness. Marked differences in force patterns were observed. Swallowing forces were predominantly higher than those when speaking, chewing, sucking and resting. Forces related to location were significantly different. No correlation was found between force value and head-angulation. Forces recorded when contours were changed were found to be reduced significantly a fortnight later. Forces recorded on the original contours, at the beginning and end of the experiment, showed no significant difference. It was found that the inclusion of eight transducers made possible a more accurate record of oral muscular activity than has been possible previously and it is confirmed that the subjects selected showed considerable ability to adapt to changes in denture profile.

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