抄録
Full balanced occlusion and lingualized occlusion of the upper and lower complete dentures were studied about deformation using a model programs of long term exercise of denture under similar conditions in vivo.
Deformation of the denture was analyzed by strain gauges placed on the middle line of the denture base after three hundred thousand times of lateral gliding movement in water at 37°C. The lateral gliding excursion was tested at three different distances (0, 0.5, 2.0mm).
This study showed that tensile strain in the centric occlusion and compressive strain during lateral gliding excursion occured at the central area of the dentures. The proportional increase of maxmum shear strain was brought about by the increase of lateral gliding excursions. The data suggested therefore that quality, thickness, and reinforcement of denture must be carefully designed if long lateral gliding excursion is needed.
With respect to two types of occlusions, lingualized occlusion was found to give less deformation and better distribution of stress as compared to full balanced occlusion at any length of duty time tested.
In conclusion, these results proved that the lingualized occlusion is superior to full balanced occlusion in terms of deformation and stress distribution.
