Magister Scientiae Dentium - MSc(Dent) / The aim of this research project was to assess the accuracy of four different types of VTO [Steyn (1979), Jacobson and Sadowsky (1980), Ricketts (1982) and Holdaway (1984)], in predicting the final result of the incisor and soft tissue response to orthodontic treatment in bimaxillary protrusive patients. / South Africa

Deformation of the orthodontic bracket upon wire engagement may result in torque dissipation within the bracket rather than transmission to the tooth and its supporting structures. The purpose of this study was: 1) quantify the amount of torque expression and 2) quantify any deformation as a result of such increasing torque expression. Digital image correlation is an accurate means of analyzing an orthodontic bracket's structural response to an applied moment of force created through archwire rotation in vitro. A sample of 30 Orthos and 30 OrthosTi brackets were tested with custom software using a novel application of digital image correlation. OrthosTi brackets produce significantly greater amounts of torque from 48 to 24 returning to a neutral position. Titanium brackets exhibit greater variance in torque expression but less variance in deformation. Orthos stainless steel brackets exhibit significantly greater amounts of bracket slot deformation in comparison to the OrthosTi. / Orthodontics

<p>The aim of this research project was to assess the accuracy of four different types of VTO&rsquo / s, [Steyn (1979), Jacobson and Sadowsky (1980), Ricketts (1982) and Holdaway (1984)], in predicting the final result of the incisor and soft tissue response to orthodontic treatment in bimaxillary protrusive patients.</p>

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<p>The aim of this research project was to assess the accuracy of four different types of VTO&rsquo / s, [Steyn (1979), Jacobson and Sadowsky (1980), Ricketts (1982) and Holdaway (1984)], in predicting the final result of the incisor and soft tissue response to orthodontic treatment in bimaxillary protrusive patients.</p>

Many of the undesirable side effects that occur during orthodontic treatment can be attributed directly to a lack of understanding of the physics involved in a given adjustment of an orthodontic appliance. A large number of variables in orthodontic treatment are not within our control, such as growth and tissue response to appliances. However, the force placed on the tooth should be a controllable variable (1), and careful study of the physics underlying our clinical application, can help in reducing those undesirable side effects. If researchers and clinicians can quantify the force systems applied to the teeth, they can better understand clinical and histologic responses. Orthodontic force systems used in everyday orthodontic mechanics are considered indeterminate force systems, in other words, there are too many unknowns to determine the different components of these force systems. Until recently, much of the literature was restricted to experimental two-dimensional analyses of the biomechanical aspects of orthodontic force systems, and computer modeling of three-dimensional analyses. Very little evidence exists in the literature regarding three dimensional experimental measurement and analysis of orthodontic force systems (2). Force system measurements were made on one or two tooth models, however in order for us to understand the orthodontic force systems we need to simultaneously, measure in 3D, the forces being applied on every tooth in the dental arch. With the very recent technological advances in force/torque sensors technology, data acquisition and data representation, it became possible to measure those forces and reveal the force systems we are applying to the dentition. The purpose of this PhD research study is the design and construction of an experimental device that is capable of revealing the details of the force systems used in modern day orthodontic mechano-therapy of continuous arch technique. / Orthodontics

Thesis--Malmö University, 2008. / Includes two papers on which the thesis is based: Extraoral versus intraoral appliance for distal movement of maxillary first molars : a randomized controlled trial / Lars Bondemark, Ingela Karlsson; and, Intraoral maxillary molar distalization : movement before and after eruption of second molars / Ingela Karlsson, Lars Bondemark. Both papers were published in Angle orthodontist. Online version available via MUEP, Malmö University Electronic Publishing.

Thesis (doctoral)--Karolinska Institutet, Stockholm, 1983. / Extra t.p. with thesis statement inserted. Includes the author's six articles published in various journals. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.