The "Wits" appraisal of jaw disharmony.

American Journal of Orthodontics 03/1975; 67(2):125-38. DOI: 10.1016/S0889-5406(03)00540-7
Source: PubMed

ABSTRACT The "Wits" appraisal of jaw disharmony is a simple method whereby the severity or degree of anteroposterior jaw dysplasia may be measured on a lateral cephalometic head film. The method entails drawing perpendiculars from points A and B on the maxilla and mandible, respectively, onto the occlusal plane. The points of contact of the perpendiculars onto the occlusal plane are labeled AO and BO, respectively. In a sample of twenty-one male and twenty-five female adults selected on the basis of excellence of occlusion, it was found, on the average, that in females points AO and BO coincided and in males point BO was located 1 mm. ahead of point AO. In skeltal Class II jaw dysplasias, point BO would be positioned well behind point AO (positive reading), whereas in Class III skeltal jaw disharmonies, the "Wits" reading would be negative, that is, with point BO ahead of point AO. The advantages of the "Wits" appraisal over that of the conventional ANB angle reading are illustrated and discussed.

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    ABSTRACT: Objectives: To check the predictability and variability of Mount Vernon Index (MVI) with other four sagittal discrepancy parameter and to examine and discuss the correlation existing between. Methods: Lateral Cephalograms of 100 Class I Indian subjects with the age range of 17-24 years were obtained. Cephalograms were traced using sharp 3H pencil on lead acetate paper for four different AP parameters like ANB, Wits appraisal, Facial convexity and Beta angle. For all Cephalograms, Mount Vernon Index was calculated. Results: The measurements with most homogenous distribution in group was BETA angle (C.V=5.63) followed by MVI (C.V.=13.6), ANB, Rickett's analysis and Wit's analysis. Among all five analyses, statistically significant highest positive correlation was found between Mount Vernon Index and BETA angle. Other angles like, Rickett's facial convexity angle and ANB angle showed significant positive correlation with Mount Vernon Index. Conclusions: MVI is a quick and reliable method for evaluation of a patient's AP skeletal patterns. It can be one of the useful diagnostic tools to identify the skeletal pattern of an individual.
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