For the anatomic term for part of a tooth, see Crown (tooth) and Dental anatomy#Crown and root. 1  A porcelain-fused-to-metal crown for tooth No. 29 on its stone model. It is now ready to be cemented into the patient's mouth. 2  The stone model die for the same PFM crown on tooth No. 29.
A licensed vaccine to prevent measles first became available in 1963, and an improved one in 1968. Vaccines for mumps and rubella became available in 1967 and 1969, respectively. The three vaccines (for mumps, measles, and rubella) were combined in 1971 to become the measles-mumps-rubella (MMR) vaccine. The MMR vaccine is generally administered to children around the age of one year, with a second dose before starting school (i.e. age 4/5).
Vaccination against measles was introduced in 1968. The measles antigen was combined with mumps and rubella with the introduction of the combined MMR vaccine in 1988. Increased incidence of measles in 1994 prompted mass school vaccination with measles and rubella (MR) vaccine for all children aged five to 16 years.A second dose of MMR was introduced for pre-school children in 1996, as a one dose programme would not support eventual measles elimination.ncreased incidence of measles in 1994 prompted mass school vaccination with measles and rubella (MR) vaccine for all children aged five to 16 years. A second dose of MMR was introduced for pre-school children in 1996, as a one dose programme would not support eventual measles elimination.