Forty cases demonstrating at least 3 mm of lingual movement of the upper incisors were analyzed to determine the soft-tissue prediction accuracy of the Holdaway and the Ricketts methods. Initial analysis was performed by comparing predictions based on pre-treatment cephalometric tracings to post-treatment tracings. Lack of congruency was considered error and statistical analysis followed. The Ricketts method was shown to be superior for upper lip prediction on the combined 40 cases. Neither method proved superior in predicting the lower lip.
Further analysis involved segregating the cases according to individual functional lip abnormalities and again comparing the two methods for accuracy. The Holdaway method was found to be superior for lower lip predictions in cases of "lip sucking" and "lower eversion". The Ricketts method proved superior in predicting the lower lip in cases of "upper proversion". A chart was composed to indicate the varying degrees of superiority of each method, and alterations of the two methods to improve accuracy were suggested.
Lloyd E. Gauntt
Robert J. Schulhof
Virgil V. Heinrich
Clelan G. Ehrler
Logan W. Barnard
Master of Science (MS)
Year Degree Awarded
Date (Title Page)
Library of Congress/MESH Subject Headings
Sulfhydryl Compounds -- pharmacology; Drug Hypersensitivity; Escherichia coli -- physiology.
1 vii; 25
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Zierenberg, Roger H. Jr., "Soft Tissue Profile Prediction: An Evaluation of Methods" (1976). Loma Linda University Electronic Theses, Dissertations & Projects. 1848.
Loma Linda University Electronic Theses and Dissertations
Loma Linda University. Del E. Webb Memorial Library. University Archives