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A COMPARISON OF EXTRACTION RATES IN TWO-PHASE VERSUS ONE-PHASE
CLASS II MALOCCLUSION PATIENTS
by
April Jalene Lee
____________________________________________________________________
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 2008
Copyright 2008 April Jalene Lee
Object Description
| Title | A comparison of extraction rates in two-phase versus one-phase class II malocclusion patients |
| Author | Lee, April Jalene |
| Author email | aprillee@usc.edu |
| Degree | Master of Science |
| Document type | Thesis |
| Degree program | Dentistry |
| School | School of Dentistry |
| Date defended/completed | 2008-03-10 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-04-15 |
| Advisor (committee chair) | Sameshima, Glenn T. |
| Advisor (committee member) |
Paine, Michael Moon, Holly |
| Abstract | Introduction: Although the pros and cons of early two-phase treatment to correct Class II malocclusions have been examined, there is no study to date relating early growth modification techniques to final extraction rates and tooth position outcomes. Methods: Patients (n=61; age 6-17) were evaluated from a private orthodontic practice in Southern California; 41 patients were treated in a single phase, and 20 patients in two-phases. Full records were examined to compare (1) extraction rates in the permanent dentition and (2) final cephalometric numbers. Results: There was a 20% rate of premolar extraction in the two-phase group versus a 43.90% extraction rate in the single phase group (p=0.07). Final cephalometric numbers showed a significant difference in IMPA (p=0.05) with more flaring in the early treatment group, and no differences in ANB change. Conclusion: Early orthodontic intervention of Class II malocclusion resulted in reduced rates of premolar extractions with similar skeletal outcomes. |
| Keyword | class II; malocclusion; extraction rates |
| 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 |
| Type | texts |
| Legacy record ID | usctheses-m1122 |
| Contributing entity | University of Southern California |
| Rights | Lee, April Jalene |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | cisadmin@dots.usc.edu |
| Filename | etd-Lee-20080415 |
| Archival file | uscthesesreloadpub_Volume40/etd-Lee-20080415.pdf |
Description
| Title | Page 1 |
| Contributing entity | University of Southern California |
| Repository email | cisadmin@dots.usc.edu |
| Full text | A COMPARISON OF EXTRACTION RATES IN TWO-PHASE VERSUS ONE-PHASE CLASS II MALOCCLUSION PATIENTS by April Jalene Lee ____________________________________________________________________ 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 2008 Copyright 2008 April Jalene Lee |
