1. 1) Y. Okazaki: J. Artif. Organs 15 (2012) 20–25.
2. 2) Ministry of Health, Labour and Welfare: Notification 0912 No. 2, Tokyo, Japan, September 12, 2014.
3. 3) Yakumukoho: No. 2489, Yakumukohosha, Tokyo, Japan, June 1, 2018, p. 385.
4. 4) JIS T 6121: Base metal materials for dental metal-ceramic restorations, (Japanese Standards Association, Tokyo, Japan, 2013).
5. 5) JIS T 6115: Dental casting cobalt chromium alloys, (Japanese Standards Association, Tokyo, Japan, 2013).