Abstract
Results of experimental examinations are reported on the surface roughness measurement of replicas, using a new surface tester. The touching force of the stylus of this tester is only 4 mg. The force of 4 mg is equal to the opening force of a break switch used as a sensor of a servomechanism in the tester. The opening force presumably contains some adhesion force. The results of measurement show that the adhesion force is about 10% of the touching force. Now, surface roughness of a sample piece and its replicas are measured by this tester. For replica materials, two kinds of plastics are used; one is a new dental impression plastics, and the other, a laminated plastic plate composed of three layers. Both of them are presumed to be superior to conventional replica materials in copying accuracy. The sample piece has a roughness about 3 μm of peak-to-peak value. Roughness values of it and its replicas measured by this tester, are well agreed with the results measured by light interference photomicrographs.
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