1989 Volume 35 Issue 1 Pages 16-30
The postoperative prediction by the paper surgery was made on 36 cases operated by sagittal splitting osteotomy of the mandibular ramus. The new technique was planned and carried out as follows: In the oral cavity, the plaster cast of the mandibular dental arch (after application of a solution of barium sulfate) was positioned against the maxillary dental arch in three dimensions, using the occlusal splint of the model operation as a guide. Under this state, tt lateral head film was taken and the trace of mandibular teeth crowns was positioned, adjusting them to the intermaxillary relationship of teeth crowns on the film. Comparing this modified method with the present method on the amount of aberration of the prediction in all measuring points, the following results were obtained:
1. Postoperative prediction of each case by the modified method was remarkably correct in comparison with the conventional method, and was statistically significant. In Japan mandibular deformities could be most frequently seen in jaw deformities, and various orthognathic surgeries had be done. This modified method could apply to these operations and was considered to be very useful because of its simplicity.
2. As the mandibular occlusal plane was rotated on the paper surgery in the frontal plane or the horizontal plane in the range of general clinical cases, the trace of teeth crowns of the mandibular rest position was not in conformity with the trace of teeth crowns of the mandibular model. But exact prediction was gained by this modified method.
3. The occlusal splint was considered to be significant to many purposes.
