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).
In one in 6,000 cases it can lead to inflammation of the brain; in one in 3,000 cases it can affect blood clotting. The incubation period for rubella is 14 to 21 days, with most people developing a rash between 14 and 17 days after exposure.