Abstract:The purpose of our study was to develop a computer aided system for designing and fabricating removable dentures (CAD/CAM system). In our newly developed system, anatomical and morphological information of denture space including edentulous residual alveolar ridges and surrounding tissues were obtained from a maxillomandibular double impression mounted on a high speed 3-D laser scanning machine. Artificial teeth arrangements, outline of polished surface, and denture border location were determined at a work station by means of the database of a standard denture fabrication. Then 3-D data established at the work station was transferred to a 3-D laser lithography machine and a mandibular complete denture was fabricated with photo-cured resin material.
The Japanese Committee for the National Registry of Subacute Sclerosing Panencephalitis (SSPE) confirmed that 215 cases of SSPE occurred in the 20 years from 1966 to 1985, as discovered in the 10-year surveillance from April 1976 through March 1986. The annual incidence in recent years has been between 10 and 23 cases. Among cases with a certain history of measles illness or measles vaccination, 184 (90.2%) had a history of measles illness without receiving measles vaccine. There were 11 probable measles vaccine-associated cases (5.4%), three (1.5%) being vaccinated with a combined use of killed and live vaccine and eight (3.9%) with further attenuated live vaccine. There were nine cases (4.4%) without a history of either measles illness or measles vaccination. Intervals between measles illness and the onset of SSPE varied from 1 to 16 years (mean, 7.0 years). The periods following measles vaccination with further attenuated live vaccine were 2 to 11 years (mean, 4.6 years). Annual incidence rates of SSPE per million cases of measles ranged between 6.1 and 40.9 (mean, 16.1) in the 10 measles epidemic years 1968-1977, and those following vaccination with further attenuated live vaccine were zero in most years and at the highest 3.08 (mean, 0.9) per million doses of distributed vaccine.
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