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KMID : 0354619950070010151
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Journal Dankook Dental Research Institute
1995 Volume.7 No. 1 p.151 ~ p.166
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The cephalometric study of skeletal types in Cl Ⅲ malocclusion with reduced lower anterior face height
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Abstract
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A given facial type can be considered as a syndrome in which various features are aggregated, so a single parameter is not sufficient to accurately identify a given facial type. This study was designed to identyfy & characterize the skeletal types that blend under the headline-´Cl Ⅲ,deepbite´.
Cephalograms of thirty-four untreated mixed dentition patients, selected mainly on the basis of clinical impression of Cl Ⅲ with reduced lower fair heights were studied. The following conclusion can be drawn.
1. Cl Ⅲ malocclusion with reduced lower face height could be cTassified into three types.
2. Subtype 1 was identified by the following features strong ramus, more anteriorly positioned upper molars without alveolar hypoplasia, acutely reduced Mn. plane angle.
3. Subtype 2 was characterized by a short ramus, sharply reduced postrior alveolar height, and mormal Mn plane angle. In general, this type had hypoplasia tendency in the vertical dimension.
4. In subtype 3, the AUFH occupying more percentage than ALFH was a outstanding feature. Ramal height was in normal range, alveolar hypoplasia and slightly reduced Mn. plane angte was observed.
5. The features of the subtypes were reflected in certain indices, which can be regarded as discriminative index.
LAFH: if reduced, regardless of subtypes, indicates reduced lower ant. fact height consistently.
FHR: when this ratio is increased, it indicates subtype 1.
FHI: when this ratio is in normal range, it indicates subtype 2.
FPI: if reduced greatll·, it intfcates subtype 3.
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KEYWORD
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