1993 Volume 31 Issue 3 Pages 485-495
The purpose of this study was to evaluate by "Occlusogram" the forced cross-bites of primary dentition before and after occlusal adjustment.
The subjects examined in the study were 10 children with forced cross-bites (FCB). These FCB children who showed premature contacts during the mouth closing pathway from the muscle position were given occlusal adjustment treatment by grinding. The cast models of the dentitions and the bite checks were obtained before and after treatment with the black silicon paste in the intercuspal position. The occlusal changes were then examined by a computerized image detection system designated as "Occlusogram" which was a newly developed measure in our department. An outline of each tooth of the upper and lower jaw, and occlusal contacts input by CCD camera to a computer were superimposed on the occlusal plane.
The following results were obtained;
1. Significant increase of the coronal arch length of the upper jaw and decrease of that of the lower jaw were found, after occlusal adjustment.
2. Over jet and terminal plane changed significantly after treatment.
3. After treatment, the mandible of the FCB children shifted backward with rotation of the lower dentition as compared to the upper jaw. In conclusion FCB children show not merely functional mandibule protrusion but accompanied rotation of the mandible as well.
