Date of Award

Spring 1991

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Dentistry

First Advisor

Ferguson, Donald J.

Second Advisor

Schlamer, Robert B.

Third Advisor

Pincsak, John J.

Abstract

We live in an age of precise measurements powerfully applied. Cephalometric radiography has made it possible for the orthodontist to evaluate problems and results of treatment effectively. Although the concept of comparing the patients cephalometric values to "ideal" norms is not new, no study has presented a strong argument favoring a correlation between subjective perceptions of idealized beauty and the inexorable rigidity of quantitative measurement. The purpose of this study was to determine if orthodontic cases finished to excellent clinical results compared favorably with ideal norms of the Bolton Standards. The sample used in this study consisted of patients who had excellent clinical results. Each patient was evaluated cephalometrically and skeletal measurements were compared to Bolton Standards. Several statistical comparisons were made using the pre and post-treatment lateral cephalometric radiographs. There were some significant differences (P<.05), among the ten cephalometric measurements in each comparison study. Five of the ten mean Z-scores were significantly different when comparing the pretreatment values to Bolton Standards. Four of the ten mean Z-score values had significant differences from pre to post-treatment, determined by the paired t-test. These measurements were ANB, NAP, SNA, and SNB. When post-treatment values were compared to Bolton Standards, NAP, Wits, SNA, and SNB were significantly different, (P<.05). Thus, values representing the Bolton standards were not achieved in all skeletal measurements by orthodontic therapy. The idea that excellent quality in orthodontic outcomes can be appropriatlely assessed using a set of cephalometric ideals is not supported by this research.

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