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Treatment changes and effects, and follow-up changes with Headgear-activator and Herbst appliance /Phan, Kok-leong. January 2005 (has links)
Thesis (M. Orth.)--University of Hong Kong, 2005.
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Effects of the headgear-activator appliance: a prospective study彭莉, Peng, Li, Jasmine. January 2003 (has links)
published_or_final_version / Children's Dentistry and Orthodontics / Doctoral / Doctor of Philosophy
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Guidelines for the use of wrought wire clasps for removable partial denturesNaidoo, Lushen Manickum 23 September 2010 (has links)
MDent, Faculty of Haelth Sciences, University of the Witwatersrand
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The load exerted by removable partial denture clasps conforming to average tooth curvatures, in clinically encountered undercutsNaidoo, Noland 12 May 2016 (has links)
Purpose: The aim of this study was to establish clinically relevant guidelines for the selection of clasps for removable partial dentures (RPDs) by adapting RPD clasp arms of differing materials and diameter to a three-dimensional model based on the average curvature of premolars and molars.
Method: Randomly selected discarded casts were collected that had intact first premolars and first molars. The normal clasp position for the buccal surfaces of these teeth was drawn on the cast and the teeth were then sectioned to this line, and scanned using a flatbed scanner. The average curvature and length for each group was determined using a graphics-drawing programme and a 3D model was printed using these data. Clasp materials were then be adapted to these models using the wrought wires: Leowire (Leone, Fiorentino, Italy) (stainless steel); Remanium Hard (Dentaurum, Pforzheim, Germany) (stellite alloy of chromium and cobalt); Noninium (Dentaurum, Pforzheim, Germany) (stainless steel, nickel free); and cast clasps cast in the stellite alloy Vitallium (Dentsply, Ontario, Canada). Two diameters of the wrought wire clasp groups were used (0.9mm and 1.0mm). Ten samples for each diameter and material were adapted to the 3D models as they would in a clinical case. Each clasp was then randomly deformed beyond its proportional limit in a tensile testing machine (Instron Corporation, High Wycombe, United Kingdom) and the forces exerted at that limit and at deflections of 0.25 mm, 0.5 mm, and 0.75 mm were measured, as these are the clinically encountered undercuts. Statistical analysis was carried out to determine if the forces exerted at these deflections were within the proportional limit of the clasp, but also significantly within the realistic limit (defined as two standard deviations from the proportional limit) to allow for variations in manufacture and application of the clasp arms.
Results: The results confirmed the effect of material, length, and diameter on flexibility for the wrought wires. A table was produced with guidelines for those clasps which could be used safely within their realistic limits and therefore should provide longevity of service. The greatest force exerted on premolar clasp length arms was provided by Leowire at 0.25mm undercut (606g); although it was 2% greater than its realistic limit, this was considered sufficiently within the safety factor to
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recommend its clinical use. The greatest force exerted on molar clasp length arms was provided by Remanium Hard at a deflection of 0.5 mm (417g). Cast clasps for premolars should not be prescribed as they were all well above their realistic limits. Cast clasps should only be selected for molars if the clasp arm is longer than 14.5mm. At a deflection of 0.25 mm the cast arm exerted a force of 773g but whilst this was below its proportional limit, it was higher than its realistic limit.
Conclusions: The results of this study provide valid guidelines for the clinical application of clasp arms in removable partial dentures. It is recommended that clinical studies be carried out to confirm the longevity of clasp arms based on these data. / MT2016
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From Kurzweil-Henstock integration to charges in Euclidean spacesMoonens, Laurent 11 April 2008 (has links)
An m charge in the n dimensional Euclidean space is a linear functional acting on m dimensional polyhedral chains and satisfying the following continuity condition. The value of the linear functional approaches zero on chains whose normal masses are bounded and whose flat norms asymptotically vanish. Our main theorem relates m charges to pairs of continuous differential forms.
Luzin's theorem states that every measurable function on the line is the derivative of a continuous, almost everywhere differentiable function. We show this can be improved in several dimensions.
Finally we prove that a compact subset C of the n dimensional Euclidean space does not support the distributional divergence of a bounded measurable vector field if and only if C has vanishing (n-1) dimensional Hausdorff measure.
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Treatment changes and effects, and follow-up changes with Headgear-activator and Herbst appliancePhan, Kok-leong., 彭國良. January 2005 (has links)
published_or_final_version / Dentistry / Master / Master of Orthodontics
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Three-dimensional photoelastic stress analysis of a distal extension removable partial denture with and without proximal guide platesBressler, Douglas S. January 1977 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1977. / Typescript (photocopy). Includes bibliographical references (leaves 45-50). Also issued in print.
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An evaluation of wear of prosthetic tooth materialsJohnson, Gary William. January 1973 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1973. / Typescript (photocopy). Includes bibliographical references (leaves 53-55). Also issued in print.
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An evaluation of wear of prosthetic tooth materialsJohnson, Gary William. January 1973 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1973. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 53-55).
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Three-dimensional photoelastic stress analysis of a distal extension removable partial denture with and without proximal guide platesBressler, Douglas S. January 1977 (has links)
Thesis (M.S.)--University of Michigan, Ann Arbor, 1977. / Typescript (photocopy). eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 45-50).
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