Abstract
The purpose of the present cephalometric investigation was to establish a link in the series of morphological researches discriminating vertical patterns by the following means.
1. Developing an algorithm to discriminate vertical patterns of Class II malocclusions.
2. Clearly defining disparity of algorithms to discriminate vertical patterns between Class II and Class III.
3. Clinically applying the algorithm and examining its validity.
The subjects for this investigation were 117 female patients aged 15 years and over with the chief complaint of maxillary protrusion. The maxillary protrusions of 61 patients were accompanied by open bite, and those of 56 patients by deep bite. All the data were derived from initial lateral cephalometric radiographs.
The results of this investigation were as follows:
1. The value indicated by vertical indicator (VI) for Class II was y=-0.41(Lower facial height)+0.35(W its appraisal)+ 19.78.
2. The primary factor, when applied to vertical patterns, is less complicated in Class II than Class III.
3. Diagnosis of vertical patterns with VI for orthgnathic surgery was accomplished, the degree of treatment effect accompanying it was understood, and an index of stability for post treatment was obtained.
