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COMPARISON OF PREMOLAR EXTRACTION RATES BETWEEN ONE-PHASE AND
Copyright 2012
TWO-PHASE CLASS II MALOCCLUSION
by
Laura Harshbarger
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
(CRANIO-FACIAL BIOLOGY)
May 2012
Laura Harshbarger
Object Description
| Title | Comparison of premolar extraction rates between one-phase and two-phase class II malocclusion |
| Author | Harshbarger, Laura T. |
| Author email | lharshba@usc.edu |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Cranio-Facial Biology |
| School | School of Dentistry |
| Date defended/completed | 2012-02-06 |
| Date submitted | 2012-04-29 |
| Date approved | 2012-04-30 |
| Restricted until | 2012-04-30 |
| Date published | 2012-04-30 |
| Advisor (committee chair) | Sameshima, Glenn |
| Advisor (committee member) |
Paine, Michael Enciso, Reyes |
| Abstract | INTRODUCTION: The timing of treatment for Class II malocclusion has been heavily studied yet still remains to be a controversial clinical issue. This study specifically evaluates the ability of Class II growth modification to prevent the need for premolar extraction and the effect it has on cephalometric measurements. ❧ MATERIALS AND METHODS: Patient records from the private practice office of an American Board of Orthodontics diplomate in Southern California were evaluated for this study. A total of 106 patient records were examined, 36 were treated in two-phases and 70 were treated in a single-phase. The complete records of each patient were analyzed to compare premolar extraction rates between the two treatment groups and their resulting cephalometric measurements. ❧ RESULTS: There was no significant difference in extraction rate between two-phase and single-phase treatment. The single-phase treatment group had an extraction rate of 18.6% (13 out of 70 patients) while the extraction rate for the two-phase group was 13.9% (5 of the 36 patients)(p-value 0.543). The change in ANB was the only significant cephalometric difference between two-phase and single-phase treatment with more change occurring in two-phase treatment. ❧ CONCLUSION: The results of this study conclude that two-phase Class II treatment does not reduce the rate of premolar extraction by a significant amount. In addition, early orthodontic treatment does not affect cephalometric outcomes, with the exception of ANB. |
| Keyword | Class II; extraction rate; two-phase treatment |
| 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-m |
| Contributing entity | University of Southern California |
| Rights | Harshbarger, Laura T. |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume4/etd-Harshbarge-677-0.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Full text | COMPARISON OF PREMOLAR EXTRACTION RATES BETWEEN ONE-PHASE AND Copyright 2012 TWO-PHASE CLASS II MALOCCLUSION by Laura Harshbarger 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 (CRANIO-FACIAL BIOLOGY) May 2012 Laura Harshbarger |
