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A CONE BEAM-CT EVALUATION OF THE AVAILABILITY OF SPACE FOR COMPLETE ARCH RETRACTION IN THE MANDIBLE WITH TADs
by
Daniel Han
A Thesis Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF SCIENCE
(CRANIOFACIAL BIOLOGY)
May 2009
Copyright 2009 Daniel Han
Object Description
| Title | A cone beam-CT evaluation of the availability of space for complete arch retraction in the mandible with TADs |
| Author | Han, Woo Daniel |
| Author email | danielhandds@gmail.com; whan@usc.edu |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Cranio-Facial Biology |
| School | School of Dentistry |
| Date defended/completed | 2009-03-02 |
| Date submitted | 2009 |
| Restricted until | Unrestricted |
| Date published | 2009-04-27 |
| Advisor (committee chair) | Sameshima, Glenn |
| Advisor (committee member) |
Paine, Michael Moon, Holly |
| Abstract | The purpose of this study was to determine the amount of space available distal to the most posterior tooth in the mandibular arch for complete arch distalization. Methods: CBCT scans from 146 (110 after exclusion criteria) patients were rendered using InVivo DentalTM Software. A 1:1 ratio panoramic image was reconstructed from each scan. A horizontal measurement, parallel to the functional occlusal plane, was recorded from the distal height of contour of the most posterior tooth to the ascending ramus. The advantages of using a CBCT reconstruction are: (1) A traditional panoramic radiograph uses an arbitrary focal trough; (2) There is inherent error and distortion due to the magnification in the traditional panoramic radiograph; (3) The magnification from traditional radiographs makes measurements very unreliable; (4) Contrast is improved with CBCT and blurring and overlapping is eliminated. Results: There was an average of 7.27 mm [7.24 mm (left) and 7.29 mm (right)] distal to lower second molars and 2.80 mm [2.75 mm (left) and 2.85 mm (right)] distal to lower third molars. Overall, males averaged more space: distal to mandibular second molars: (1) males: 7.32 mm (right), 7.41 mm (left); (2) females: 7.26 mm (right), 7.08 mm (left); Distal to mandibular third molars: (1) males: 3.08 mm (right), 3.05 mm (left); (2) females: 2.59 mm (right), 2.34 mm (left). Conclusion: The space available for retraction distal to the second molars in the mandibular arch was 7.27 mm; however, the thickness of the soft tissue must be accounted for. With the average mucosal depth of 3.02 mm in the retromolar region, the available space for retraction is reduced to 4.25 mm per side. This amount would be enough to correct 8.5 mm of anterior crowding barring curve of spee, correct half step class III, or possibly a change from extraction to non-extraction treatment plan. The space distal to the third molars was 2.80 mm which leaves no space for retraction on account of the soft tissue. |
| Keyword | TAD; mandible; retraction; distalization; CT; class III |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m2115 |
| Rights | Han, Woo Daniel |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Han-2765 |
| Archival file | uscthesesreloadpub_Volume17/etd-Han-2765.pdf |
Description
| Title | Page 1 |
| Full text | A CONE BEAM-CT EVALUATION OF THE AVAILABILITY OF SPACE FOR COMPLETE ARCH RETRACTION IN THE MANDIBLE WITH TADs by Daniel Han A Thesis Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE (CRANIOFACIAL BIOLOGY) May 2009 Copyright 2009 Daniel Han |
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