Abstract ▼ AI-Helper

The maxillofacial patterns are important for proper treatment planning of Class Ⅲ malocclusion. Especially, precise and simple method of differential diagnosis is necessary between maxillary undergrowth and mandibular overgrowth which are most frequent causes in Class Ⅲ malocclusion. This study was ...

The maxillofacial patterns are important for proper treatment planning of Class Ⅲ malocclusion. Especially, precise and simple method of differential diagnosis is necessary between maxillary undergrowth and mandibular overgrowth which are most frequent causes in Class Ⅲ malocclusion. This study was undertaken to make differential diagnosis of Class Ⅲ malocclusion using routine cephalometric radiograms. Some angular measurements for differential diagnosis were developed as follows. 1. The angular measurement that could differentiate maxillary undergrowth was obtained, and this measurement(FH-OP + Cranial base angle) was designated as MUI(Maxillary Undergrowth Index). 2. The patient could be diagnosed as maxillary undergrowth, if the MUI was above 36˚ in Class Ⅲ malocclusion. 3. The angular measurement that could differentiate mandibular overgrowth was obtained, and this measurement(SNB + Facial angle + Or-C- Vertical plane) was designated as MOI(Mandibular Overgrowth Index). 4. The patient could be diagnosed as mandibular overgrowth, if the MOI was above 182˚ in Class Ⅲ malocclusion.

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