Date of Award

Spring 1998

Document Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Dentistry

First Advisor

Ferfuson, Donald J.

Second Advisor

Kittleson, Russell T.

Third Advisor

Schuckit, William I.

Abstract

The purpose of the study was to determine if a maxillary axis, as defined by either M point or CR point, could be used to accurately predict the horizontal and vertical changes in maxillary position during growth. M point was used to represent the anterior maxilla in a lateral cephalometric radiograph and was defined as the midpoint of the circle that was tangent to the superior, anterior, and palatal outlines of the maxilla. CR point represented the center of resistance of the maxilla in the sagittal plane and was located one-half the distance between the inferior border of the orbit and the functional occlusal plane on a line that was perpendicular to the functional occlusal plane at the most distal contact of the maxillary first molars. The sample consisted of 39 untreated subjects from the Mooseheart Growth Study that had lateral cephalometric radiographs taken annually between the ages of 8 and 18. Twelve landmarks were identified on each cephalogram and a combination of three linear and three angular measurements were recorded. Pearson correlation testing was performed to assess each measurement variable as a function of age. The future position of the maxilla could not be predicted at a clinically significant level (r<0.8) from an early age with measurements that used either M point or CR point. The measurement variables were also correlated with each other to ascertain the strength of the relationship among them. Both the angular and linear measurements that utilized M point and the linear measurements that used CR point were clinically predictive (r>0.8) of maxillary growth when correlated with mandibular growth under the conditions of the study.

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