Abstract
In order to clarify various aspects of bearing stress due to change of buccolingual arrangement at centric occlusion, distribution and mobility of bearing stress applied on the basal seat of the complete upper denture were comparatively studied.
The results were as follows:
1. Bearing stress distribution
1) Bearing stress on bone was low compared with that of mucosa in all of C, B and P arrangements.
2) Bearing stress on the ridge, border and buccal was increased in B compared with C, while it was decreased in P. The stress on the palate and postdam was decreased in B, while it was increased in P.
2. Bearing stress mobility
1) Duration of bearing stress on bone was shorter compared with that of mucosa in all arrangements. It was remarkably shorter on the palate and tuberosity in B as well as on the buccal and tuberosity in P.
2) Duration of bearing stress on the ridge, border and buccal in B was approximately equal to that of C, while it was shorter on the border and buccal in P. The stress on the palate and postdam in B was reduced, while it was extended in P.
3) Load reaching time was approximately equal in all arrangements.
4) Duration of bearing stress was approximately equal to load reaching time in all arrangements. It was shorter on the palate, postdam and tuberosity of bone in B as well as on the border, buccal, postdam and tuberosity of bone in P.
