| Budget Amount *help |
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1993: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1992: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1991: ¥700,000 (Direct Cost: ¥700,000)
|
|---|
| Research Abstract |
As a hydrophilic denture base resin has been compared with a ordinary hydrophobic resin. It has become apparent that some faults does existed in hydrophilic resin on its mechanical properties and water sorption, regardless to the lower contact angle indicating the favorable wettability with saliva. to decrease the water sorption and to improve the mechanical properties, and preserve the favorable wettability with saliva, only used hydrophilic resin onto the tissue side upper full denture was made hydrophobic resin, and its physical properties were measured. The results was obtained that contact angle of specimen was similar to prepare from the hydrophilic resin only. And then water sorption, transversebending strength and transverse-defliction value of specimens cluld be decreased nearly at th hydeophobic resin only. From the facts mentioned above, it could be obtained that using these procedures, manintained favorable wettability with saliva, the water sorption and mechanical properti
… More
es of resultant was similar to hydrophobic resin only.
In addition to, thus far the study an devaluation of physical factor affecting retention of complate denture are almost impossible inside mouth. If this test were performed outside mouth and umder condition resembling those of oral cavity, conclusions would be much closer to reality. And then, an attempt was to evaluate these finding, retentive force was determined by measuring dislodging load required to separate denture base from used silicon impression material instead of edentulous upper jaw palate soft tissue with a film of artificial saliva interposed. Also, the retentive force on hydrophilic and ordinary hydrophobic resin were compared. It became clear, in case with hydrophilic resin, force required to separate was grater than used hydrophobic resin. It seens to be a good possibility, this test were performed outside mouth, with the method of measuring force required to separate upper full denture form instead of edentulous upper jaw soft tissue. Less
|
