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The International Journal of Adult Orthodontics & Orthogathic Surgery
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International Journal of Adult Orthodontics and Orthognathic Surgery

Year 1997
Volume 12 , Issue 3

Pages: 189 - 195

A diagnostic index of vertical problems for Class III malocclusions

Miyajima/McNamara, Jr/Murata

A cephalometric investigation was undertaken to derive a vertical indicator--a single value derived from a series of cephalometric variables that can be used in the differential diagnosis of Class III patients. The subjects consisted of 76 Japanese female patients whose chief complaint was anterior crossbite and who presented with either open bite or anterior deep overbite. All the data were derived from the initial lateral cephalometric radiographs. The main skeletal measurements that characterize vertical problems were selected using cluster analysis, principal component analysis, and discriminant analy sis. As a result, a Class III vertical indicator was derived. The vertical indicator score for deep overbite was -2.5 +- 2.2, whereas the vertical indicator score for open bite was +2.5 +- 2.3. This vertical indicator may be used in diagnosing the nature of vertical problems and determining the appropriate treatment and prognosis for the individual Class III female patient.


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