[Influences of tooth contact patterns during mandibular retrusion on the terminal jaw relation of habitual closures].
Influence 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 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.
1st Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University.
K
K
Miyoshi
D000328:Adult; D006801:Humans; D008297:Male; D008334:Mandible / Q000502:physiology*; D009055:Mouth / Q000502:physiology*; D014070:Tooth / Q000502:physiology*