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. 1999 Feb;2(1):34-41.
doi: 10.1111/ocr.1999.2.1.34.

The Use of Linear and Angular Measurements of Maxillo-Mandibular Anteroposterior Discrepancies

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The Use of Linear and Angular Measurements of Maxillo-Mandibular Anteroposterior Discrepancies

V F Ferrario et al. Clin Orthod Res. .

Abstract

Objectives: To extend the assessment of the clinical significance of the measurement of the anteroposterior discrepancy between maxilla and mandible on the bisector of the palatal plane to mandibular plane angle to a large group of randomly selected patients of both sexes, and to verify the correlation of this measurement to well established angular and linear assessments of anteroposterior discrepancy.

Design: Retrospective analysis of pre-treatment lateral cephalometric radiographs.

Setting and sample population: The Laboratory of Functional Anatomy of the Stomatognathic Apparatus at Milan University, Italy. Three hundred and six orthodontic patients (165 males, 141 females) aged between 6 and 50 years.

Experimental variable: ANB angle; corrected ANB* angle which compensates for the position of the maxilla and rotation of the mandible relative to the cranial base; Wits appraisal; MM-Wits: linear distance between the projections of A and B points on the bisector of the palatal plane to mandibular plane angle.

Results: The MM-Wits distance was significantly correlated to two angles (ANB and ANB*), as well as to the Wits appraisal. All the correlations performed did not show sex- or age-characteristic patterns. The correlation to the corrected ANB* was the best among the three, with a correlation coefficient of 0.915, MM-Wits (mm) = 1.497 x ANB* (degrees) -6.784. From the correlation, reference values for the new measurement have also been estimated, and found to be between -0.65 and -6.85 mm for skeletal Class I individuals.

Conclusion: It is recommended that the diagnosis of orthodontic anomalies should be performed taking into consideration more than a single anteroposterior appraisal.

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