下顎後方運動誘導部の変化が習慣性開閉口運動の閉口終末位に及ぼす影響

抄録

Influences of tooth contact patterns during mandibular retrusion on the terminal jaw relation (TJR) of habitual closures were investigated on five subjects.
A maxillary stabilization splint with steep retrusive contacts was fabricated and applied to each subject for one week in the first series of this experiment.
In the second series, steepness of the retrusive contacts was reduced and the splint with flat occlusal surface was applied.
After each series, subjects were asked to perform habitual closures with an intraoral central bearing device and their TJR was recorded.
The results were as follows:
1. TJR was influenced by the tooth contact pattern during mandibular retrusion.
2. TJR recorded after the second series tended to be more posterior than that after the first series.
3. It was suggested that the position of the condyle might change posteriorly with flatter retrusive contacts.
4. These results suggest the necessity of appropriate tooth guidance during mandibular retrusive movements for the dentulous subjects.