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Is the WITs assessment of the sagittal jaw relation according to A. Jacobson a useful diagnostic aid?


The present study shows the variations to which points A and B as well as the occlusal plane are subject when determined by seven tracers. In addition, two of theJacobson [3, 4] compared the methods given for determining the occlusal plane.

The angles SNA, SNB and ANB differ little in the seven tracers. The results that were found by the two methods for determining the occlusal plane differ significantly. For this reason, the WITs assessment appears questionable. In this context, the individualized ANB angle is referred toPanagioditis u.Witt [5] referenced.


This paper shows the variations produced when seven persons draw the points A and B and the occlusal plane. Two methods ofJacobson [3, 4] for fixing the occlusal plane are compared.

SNA, SNB and ANB-angles show slight differences when being drawn by seven persons. The results of the two methods of fixing the occlusal plane show significant differences. Thus the “WITs” appraisal ofJacobson does not seem to be very helpful but the individualized ANB angle ofPanagioditis otherWitt [5] seems to be helpful in solving this problem.


Ce travail montre les variations observées sur les tracés de sept personnes qui avaient dessiné les points A et B et le plan occlusal. On compare also deux méthodes deJacobson [3, 4] Servant à tracer le plan d'occlusion.

On a note qu'une petite différence entre les angles SNA, SNB et ANB. Par contre les results des deux méthodes deJacobson varient de manière significative. C'est pourquoi the evaluation of "WITs" nous semble être douteuse. Dans cet ordre d'idées, nous renvoyons le lecteur au travail dePanagiotidis etWitt [5]: L'angle ANB individualisé.


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  1. Dr. E. Stapf-Fiedler

    Present address: Department of Orthodontics of the Dental and Maxillofacial Clinic of the University of Cologne, Kerpener Straße 32, D-5000, Cologne 41


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Stapf-Fiedler, E. Is the WITs assessment of the sagittal jaw relation according to A. Jacobson a useful diagnostic aid? Advances in Orthodontics42, 64-70 (1981). https://doi.org/10.1007/BF02163465

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