Date of Award

Spring 2002

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)



First Advisor

Bradley, Thomas

Second Advisor

Kittleson, Russell

Third Advisor

Schuckit, William


Treatment of deep overbite is one of the most common clinical procedures in an orthodontic office throughout the world and its post-treatment tendency to return toward its initial relationship is, unfortunately, well documented. Deep overbite can be corrected by different mechanics and by different methods. The purpose of this long-term study was to evaluate, by means of analysis of angular and linear measurements of cephalograms to determine where the vertical relapse occurs after a deep overbite is corrected. A control group was utilized to investigate the effect of growth upon the treatment and the stability of deep overbite correction. Forty-three patients, thirty-four out of treatment for at least ten years and nine patients out of treatment for at least 5 years, showed a mean overbite reduction of 3.8 mm and a mean relapse of 1.6 mm. During treatment, the lower molars showed the biggest variation in vertical change, which accounted for the overbite correction. The lower incisor angulation changes during the post-treatment period demonstrated a high correlation with the relapse of the deep overbite correction. It was concluded that the deep overbite correction by extrusion of molars is stable when there was compensatory ramus growth and it is the post-treatment lower incisor labio-linguo changes that are significantly correlated with the lack of stability of deep overbite correction.



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