Three-dimensional applications in orthodontics Public Deposited

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Last Modified
  • June 7, 2019
Creator
  • Grauer, Dan
    • Affiliation: School of Dentistry, Oral and Craniofacial Biomedicine PhD Program
Abstract
  • Orthodontics as a specialty is going through a technological revolution. During the last 10 years there were more new developments in orthodontics than in the whole history of the specialty. One of the areas undergoing rapid progress is three-dimensional (3D) imaging. 3D Imaging allows for more precise evaluation of the airway. Patients displaying a Skeletal Class II had smaller airway volume while controlling for age, gender and size of face. The shape of the airway was different among individual with different antero-posterior jaw relationship. Airway volume among patients with different vertical jaw relationship displayed great variability. A good understanding of imaging concepts is important for the contemporary clinician. Most of the three-dimensional visual information is not liked yet to a clear diagnosis and prognosis classification. Visualization, measurement, creation of two-dimensional (2D) radiographs, segmentation, registration, superimposition and other quantitative analysis require specific training and specialized software in order to manipulate 3D files. In order to compare the newer 3D images with our current and historical databases, it is necessary to emulate 2D radiographs from 3D data. When we compared homologous landmark coordinates in digital and synthetic cephalograms, there was no systematic error. However when both modalities are used in the same individual the error of the method could produce clinically significant differences. A second area undergoing rapid progress is orthodontic digital models. These are qualitatively and quantitatively similar to conventional dental casts, but offer some advantages. One of these advantages is the possibility of register and superimpose them in space. The registration of digital orthodontic models to represent the patients' occlusion, as well as registration of final orthodontic models to the planned setup models was reliable. Finally, CAD/CAM technology allows for fabricating orthodontic appliances on a setup model of the planned correction. Based on a three-dimensional comparison of the planned tooth positions with the final ones, A fully customized lingual technique was very accurate in achieving the planned tooth positions in terms of translation and rotation. Digital orthodontics and digital dentistry have arrived: be part of it
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  • In Copyright
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  • "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Oral Biology at the School of Dentistry."
Advisor
  • Cevidanes, Lucia Helena Soares
Degree granting institution
  • University of North Carolina at Chapel Hill
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Place of publication
  • Chapel Hill, NC
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  • Open access
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