Axis of Rotation Related to Vertical Displacement of a Lower Unilateral Distal Extension Removable Partial Denture
Purpose: The purpose of this study was to analyze the effect of indirect retainers on the vertical displacement of lower unilateral distal extension removable partial dentures (U-RPD). Methods: An available jaw tracking system (TMJAWGRAPH (R)) was modified to measure the jaw movement and the motion...
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Veröffentlicht in: | Nihon Hotetsu Shika Gakkai Zasshi 2002/12/10, Vol.46(5), pp.655-664 |
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Format: | Artikel |
Sprache: | eng ; jpn |
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Zusammenfassung: | Purpose: The purpose of this study was to analyze the effect of indirect retainers on the vertical displacement of lower unilateral distal extension removable partial dentures (U-RPD). Methods: An available jaw tracking system (TMJAWGRAPH (R)) was modified to measure the jaw movement and the motion of aremovable partial denture, at the same time. Three markers were fixed in the U-RPD, mandible, and head, and allowed simultaneous 6 degree-of-freedom recording of their movements. The experimental denture could separate from direct retainersand indirect retainers. So, we could change denture form without changing occlusal contidion. Results: 1. The vertical denture displacement in the most posterior point in the flange (MPFP) was different with the design of indirectretainers. Without indirect retainer, vertical denture displacement increased. There was no relationship between range of motion and the vertical denture displacement. 2. The vertical denture displacement in MPFP was not influenced by the indirect retainer rest position. There was a relationship between the indirect retainer rest position and the vertical denture displacement. Conclusions: The vertical denture displacement during mouth opening was able to classify, as a whole, upper movement and rotation movement. The rotational movement had anaxis, which existed in direct retainer rest and in premolar. In this case, however, the axis had not related to the fulcrum line. |
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ISSN: | 0389-5386 1883-177X |
DOI: | 10.2186/jjps.46.655 |