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).
The CDC says most adults born in 1957 or later should get at least one dose of the MMR vaccine. Because of the risk of birth defects, all women of childbearing age should have the MMR vaccine unless they're pregnant or have proof of immunity, or proof of already being vaccinated for rubella.