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COMPARISON OF PREMOLAR EXTRACTION RATES BETWEEN ONE-PHASE
AND TWO-PHASE CLASS II MALOCCLUSION
by
Lindsey Hambleton MacFarlane
________________________________________________________________________
A Thesis Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fufillment of the
Requirements for the Degree
MASTER OF SCIENCE
(CRANIOFACIAL BIOLOGY)
May 2011
Copyright 2011 Lindsey Hambleton MacFarlane
Object Description
| Title | Comparison of premolar extraction rates between one-phase and two-phase class II malocclusion |
| Author | MacFarlane, Lindsey Hambleton |
| Author email | lhambleton@gmail.com; lmacfarlane@yahoo.com |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Dentistry |
| School | School of Dentistry |
| Date defended/completed | 2011-02-18 |
| Date submitted | 2011 |
| Restricted until | Unrestricted |
| Date published | 2011-03-09 |
| Advisor (committee chair) | Sameshima, Glenn |
| Advisor (committee member) |
Paine, Michael Moon, Holly |
| Abstract | Introduction: The pros and cons of early two-phase treatment of Class II malocclusion have been examined recently. This study examines how growth modification will affect premolar extraction rates as well as final cephalometric outcomes.; Methods: Patients (n=46; ages 7-17) from a private practice of an American Board of Orthodontics diplomat in Southern California were evaluated. 27 patients were treated in a single-phase, and 19 were treated in two-phases. Full records of each patient were examined to compare premolar extraction rates in the permanent dentitions and resulting cephalometric measurements in single- and two-phase treatment groups.; Results: Out of the 27 patients undergoing single-phase treatment, 13 out of 27 (48.1%) required premolar extractions. 6 out of the 19 (31.6%) two-phase treatment patients needed extractions. Extraction rate between the two groups proved not to be significant. (p=0.261) Final cephalometric changes show no significant changes between the two groups.; Conclusions: Early orthodontic intervention in Class II malocclusion does not provide reduced rates in premolar extraction and does not affect cephalometric outcomes. |
| Keyword | premolar; extraction |
| 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-m3686 |
| Rights | MacFarlane, Lindsey Hambleton |
| 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-MacFarlane-4382 |
| Archival file | uscthesesreloadpub_Volume48/etd-MacFarlane-4382.pdf |
Description
| Title | Page 1 |
| Full text | COMPARISON OF PREMOLAR EXTRACTION RATES BETWEEN ONE-PHASE AND TWO-PHASE CLASS II MALOCCLUSION by Lindsey Hambleton MacFarlane ________________________________________________________________________ A Thesis Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fufillment of the Requirements for the Degree MASTER OF SCIENCE (CRANIOFACIAL BIOLOGY) May 2011 Copyright 2011 Lindsey Hambleton MacFarlane |
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