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


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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    • "The average value was taken of any double features not present on the mid-sagittal plane. A cephalometric analysis of the cranial base including angular measurements (NSBa and SBaFH) and linear measurements (SN, SBa, NBa, Wits) was carried out [23]. Jaw base length and relationship was assessed in the sagittal and vertical dimensions. "
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    ABSTRACT: Introduction The cranial base plays an important role in determining how the mandible and maxilla relate to each other. This study assessed the relationship between the cranial base and jaw base in a Chinese population. Methods This study involved 83 subjects (male: 27; female: 56; age: 18.4 ± 4.2 SD years) from Hong Kong, who were classified into 3 sagittal discrepancy groups on the basis of their ANB angle. A cephalometric analysis of the angular and linear measurements of their cranial and jaw bases was carried out. The morphological characteristics of the cranial and jaw bases in the three groups were compared and assessments were made as to whether a relationship existed between the cranial base and the jaw base discrepancy. Results Significant differences were found in the cranial base angles of the three groups. Skeletal Class II cases presented with a larger NSBa, whereas skeletal Class III cases presented with a smaller NSBa (P < 0.001). In the linear measurement, skeletal Class III cases presented with a shorter NBa than skeletal Class I and II cases (P < 0.01). There was a correlation between the cranial base angle NSBa and the SNB for the whole sample, (r = -0.523, P < 0.001). Furthermore, correlations between SBaFH and Wits (r = -0.594, P < 0.001) and SBaFH and maxillary length (r = -0.616, P < 0.001) were more obvious in the skeletal Class III cases. Conclusions The cranial base appears to have a certain correlation with the jaw base relationship in a southern Chinese population. The correlation between cranial base and jaw base tends to be closer in skeletal Class III cases.
    Head & Face Medicine 08/2014; 10(1):31. DOI:10.1186/1746-160X-10-31 · 0.85 Impact Factor
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    • "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 (1959), McNamara (1984), Downs (1956), Jarabak (1972), and Wits appraisal, Jacobson (2003). "
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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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    • "All the cephalograms were taken with the same equipment and magnification factor of 8%. Cephalometric variables from many other analyses20,21,22,23 were used to generate 28 (10 angular and 18 linear) measurements per tracing. "
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    ABSTRACT: Objective To evaluate the active-treatment effects of the Forsus fatigue resistant device (Forsus) during comprehensive correction of Class II malocclusion in growing patients. Methods Fifty-four patients (mean age, 12.5 ± 1.2 years) with Class II division 1 malocclusion were consecutively treated with fixed app-liances in combination with Forsus. Lateral cephalograms were analyzed at the beginning of the fixed treatment (T1), Forsus insertion (T2), its removal (T3), and end of the comprehensive therapy (T4). Statistical comparisons were carried out by repeated-measures ANOVA with Tukey's post-hoc test (p < 0.05). Results The overall therapeutic effects were mainly dentoalveolar and occurred mostly during the active treatment with Forsus (T2-T3, mean duration = 0.5 ± 0.1 years). The overjet and overbite decreased significantly (-3.5 and -1.5 mm, respectively) and the molar relationship improved by 4.3 mm. These changes were associated with significant retroclination of the maxillary incisors (-3.1°), proclination and intrusion of the mandibular incisors (+5.0° and -1.5 mm, respectively), and mesialization of the mandibular molars (+2.0 mm). Conclusions Forsus had mainly dentoalveolar effects and contributed largely to the overall therapeutic outcome.
    Korean Journal of Orthodontics 05/2014; 44(3):136-42. DOI:10.4041/kjod.2014.44.3.136 · 1.17 Impact Factor
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