CAD/CAM MILLING CAD/CAM Milling Systems offer greater accuracy and increased productivity. Dry milling systems create very fine dust and debris which must be adressed, by selecting a proper Dust Collector. Not doing so will create an unhealthy and un-safe environment. OSHA has established permissible exposure limits for zirconium and zirconium compounds for both an 8-hour time-weighted average and a 15-minute short-term limit. Exposure to zirconium and zirconium compounds can occur via inhalation, ingestion, and eye or skin contact. In humans, contact of the skin with zirconium or zirconium compounds has caused skin granulomas in the form of linear streaks of small papules; the granulomas occurred after the application of deodorants containing sodium zirconium lactate or of cream containing zirconium oxide [Clayton and Clayton 1981, p. 2055]. Zirconium workers have also developed pulmonary granulomas after exposure to zirconium [Gosselin, Smith, and Hodge 1984, p. II-149]. One chemical engineer who had 7 years of zirconium exposure developed a pulmonary granulomatous disease; examination of all other employees in the same plant revealed no pulmonary granulomas, and the engineer's condition was attributed to prior beryllium exposure [Parmeggiani 1983, p. 2343]. Clinical examination of 22 zirconium reduction processing workers exposed for 1 to 5 years to an unspecified concentration of zirconium fumes revealed no exposure-related abnormalities [Clayton and Clayton 1981, p. 2058
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