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: Background: Knowledge of craniofacial features of Class III malocclusion is important for treatment plane and predication of treatment outcome. The aim of this study was to compare the dento-skeletal features of untreated Class III and Class I maloc-clusions in Malay female subjects. Materials and Methods: The total number of x-rays consisted of 140 pre-treatment laterals cephalometric (70 for each group) with aged ranged 18 and 24 years of age (mean age 21.10 ± 1.90) years. Assisted Simulation System for Orthognathic Surgery (CASSOS) software was used to trace all cephalometric x-rays. The 28 angular and linear measurements chosen were derived, in part, from the analysis of Steiner, McNamara, Downs, Jarabak, and Wits appraisal, Jacobson analysis. Results: Midfacial length was shorter in Class III than Class I malocclusion. Mandibular length was larger in Class III mal-occlusion. The maxillomandibular differential was increased in Class III malocclusion. Class III malocclusion shows increased of the lower anterior facial height than Class I malocclusion. The FAº showed a larger value in Class III malocclusion. The sad-dle angle of Class III malocclusion females showed more acute than Class I malocclusion females. The position of upper incisor to N-A plane shows more proclination in Class III malocclusion. Conclusion: The clinical implication of this study is a knowledge of the normal dentoskeletal patterns of Malay females with Class III and class I malocclusion for clinical and research purposes.
    International Medical Journal (1994) 07/2014; 21(3):283-286. · 0.09 Impact Factor
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    ABSTRACT: The Wits appraisal is a common linear cephalometric analytic tool established by Jacobson. It has been reported to be superior to angular cephalometric measures as it is not dependent on pericranial structures and their variations both during growth and orthodontic treatment. AIM: To obtain reference values for the Wits appraisal among Nigerians and assess the effect of the dental base geometry on it. METHODS: Lateral cephalometric radiographs of 100 Nigerian subjects with normal occlusion were analyzed to obtain the Wits appraisal, and the effect of the vertical distance from subspinale to supramentale, length of the palatal and mandibular planes, the mandibular plane angle as well as the palatal plane angle were assessed using the ANOVA and linear regression analysis. RESULTS: The mean age was 20.69 ± 4.9 years. Thirty-four (34%) were males and 66(66%) were females. Mean Wits value of -3.43 ± 3.24 mm was obtained based on the functional occlusal plane (FOP). Linear regression analysis showed that the vertical height from subspinale (A point) to supramentale (B point) caused a significant change in the Wits appraisal reading in participants still undergoing active growth process (less than 16 years of age) (p=0.02). CONCLUSIONS: It is advocated that the Wits appraisal be used as a moderator to the ANB angle among Nigerians. However, as a result of dental height variations its use in growing Nigerian children requires caution.
    Brazilian Journal of Oral Sciences 12/2013; 12(4):275-279. DOI:10.1590/S1677-32252013000400001
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    ABSTRACT: Objectives: To establish cephalometric norms of Malaysian adult Chinese. Study Design: A cross sectional study of Malaysian Chinese without any interracial marriage for two generations. Materials and Methods: Ninety eight participants aged 18-25 were selected based on Class I incisor relationship with minimal crowding, no skeletal abnormality, have not undergone any orthodontic treatment and had at least second molar to second molar dentition. Lateral cephalometric radiographs were taken, traced and digitised to produce the values to assess the skeletal, dental, soft tissue, nose and chin positions. Results: There was a significant difference between the genders on most values. Generally both the maxilla and mandible were positioned forward. There were also dentoalveolar prognathism with protrusive lips, nose and chin. Conclusion: The cephalometric norms are specific for race and gender. The values provided here would aid in the diagnosis and treatment planning of orthodontic/orthognathic patients of Chinese origin in Malaysia.
    International Medical Journal (1994) 02/2013; 20(1):87-91. · 0.09 Impact Factor