On the measurement of cranial thickness at nasion on cephalographs

Abstract
Cranial bone thickness at nasion is difficult to measure by the conventional method of drawing a line at right angles to the tangent at nasion on the outer table. The difficulty arises from a lack of uniformity of the arc in this region. The proposed use of a constructed line, drawn at 30° to the anterior projection of the Frankfort horizontal plane, provides an accurate, easily reproduceable, and compatible alternative method of measurement.

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