Abstract
For objective comparison of dentail reproduction of impressions, test blocks are required to prove that widths and angles of the carved lines are all in the defined range, and they should be available to researchers when necessary to get the same fine blocks. The authors, in the present studies, conducted to product test blocks satsifying these requirements. First of all, original pattern of the test block was prepared with lines carved in accrdance with ISO1563, and the accuracy in cross-sectional shapes of lines were confirmed by means of Surface Roughness Analying System*. Next, ruled test blocks were duplicated by electroforming from original pattern, and their accuracy is also confirmed by the same method. As a result, it proves that all the duplicated lines are almost the same as the original pattern ones. Conseqently, it proves that by the present method, test blocks satisfying the above-mentioned requirements can be mass-produced, and another merit is that by using the present method, original pattern can scathelessly be reserved for future use. Again, it proves that the test block prepared by the present method show satisfying efficiency as those for specification test. (*Surflyzer-Surfcom 703 B, Tokyo Seimitsu Co, Ltd., Tokyo)
