Date of Award

Spring 1990

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)



First Advisor

Ferguson, Donald

Second Advisor

Meyer, Ralph


For most patients with moderate class Ill malocclusions, the clinician has to decide whether early treatment would be beneficial to the patient. If orthodontic treatment is rendered before growth is complete, many class Ill patients outgrow the treatment results and surgery is necessary once growth has been completed. The most common approach to early orthodontic therapy for class Ill malocclusions involves dentoalveolar movement alone. A new treatment approach to resolution of class Ill malocclusion involves using a combination of bonded rapid maxillary expansion with a reverse pull headgear. The intent is to move the maxilla forward orthopedically. Such therapy has been shown to be helpful in early treatment of class Ill patients, and may prevent some of these individuals from having to undergo surgery after growth has ceased. There is a lack of information concerning orthopedic forward movement of the maxilla utilizing a reverse pull headgear in combination with bonded rapid maxillary expansion. This approach is not widely used by clinicians, in part, because appropriate research data is not available. Eight subjects ages eight years six months to ten years eight months were analyzed using pretreatment and post-treatment lateral cephalograms. A total of thirteen angular and linear measurements were used to access maxillary displacement vertically and anteroposteriorly in response to treatment. Paired t-tests and Pearsons' correlation were computed using the Marquette University VaxNMS cluster and SPSS-X statistical package to identify statistically significant results. Results of the study indicated that the maxilla is displaced anteriorly and vertically to a significant degree, therefore, suggesting that this form of early treatment has a direct orthopedic effect on the maxilla and is a viable early treatment regimen for class Ill patients.



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