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LONG-TERM DENTAL STABILITY OF CASES WITH AN UNCORRECTED ANTERIOR TOOTH-SIZE DISCREPANCY
by
Elaine N. Chow
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
MASTER OF SCIENCE
(CRANIOFACIAL BIOLOGY)
May 2011
Copyright 2011 Elaine N. Chow
Object Description
| Title | Long-term dental stability of cases with an uncorrected anterior tooth-size discrepancy |
| Author | Chow, Elaine Nicole |
| Author email | enchow@gmail.com; echow79@hotmail.com |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Cranio-Facial Biology |
| School | School of Dentistry |
| Date defended/completed | 2011-03-22 |
| Date submitted | 2011 |
| Restricted until | Unrestricted |
| Date published | 2011-04-05 |
| Advisor (committee chair) | Keim, Robert G. |
| Advisor (committee member) |
Paine, Michael Sinclair, Peter Moon, Holly |
| Abstract | Background: Little et al performed a long-term stability study of cases with four premolar extractions 10 and 20 years post-retention. It was found that less than 30% have a satisfactory anterior occlusion, regardless of how well the case finished. About 30% of the general population has an anterior tooth-size discrepancy, yet no stability studies have been conducted on these types of cases.; Purpose: This study aimed to assess the long-term stability of cases with an untreated anterior tooth-size discrepancy.; Methods: We evaluated the existing cases from the original long-term stability study and separated them into two groups: no anterior tooth-size discrepancy and anterior tooth-size discrepancy. The included cases were measured with digital calipers accurate to 0.01 mm for intercanine width, intermolar width, arch length, overjet, overbite, the Irregularity Index, and seven ABO cast grading criteria at 3 time points: pre-treatment (T1), post-treatment (T2), and post-retention (T3). The measurements were averaged and compared within themselves and between groups.; Results: Cases with anterior tooth-size discrepancy at T2 had worse occlusal relationship, higher Irregularity Index, and the alignment was not as good as those without an anterior tooth-size discrepancy. Most of the differences between the two groups disappeared by T3. The exception was the occlusal relationship and occlusal contact measurements, which stayed significantly worse for the anterior tooth-size discrepancy group.; Conclusion: According to the occlusal relationship measurement, it appears more difficult to fit the teeth together ideally in those with an anterior tooth-size discrepancy, and this does not self-correct over time. In most other factors, an anterior tooth-size discrepancy does not greatly affect long-term stability. |
| Keyword | Bolton Tooth-size discrepancy; long-term stability |
| 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-m3714 |
| Contributing entity | University of Southern California |
| Rights | Chow, Elaine Nicole |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@dots.usc.edu |
| Filename | etd-Chow-4475 |
| Archival file | uscthesesreloadpub_Volume17/etd-Chow-4475.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@dots.usc.edu |
| Full text | LONG-TERM DENTAL STABILITY OF CASES WITH AN UNCORRECTED ANTERIOR TOOTH-SIZE DISCREPANCY by Elaine N. Chow A Thesis Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree MASTER OF SCIENCE (CRANIOFACIAL BIOLOGY) May 2011 Copyright 2011 Elaine N. Chow |
