The crown protects the tooth or filling while a permanent crown is made from another material. For children, a stainless steel crown is commonly used to fit over a primary tooth that's been prepared to fit it. The crown covers the entire tooth and protects it from further decay.
Articulation, or more specifically course articulation, is the process of comparing the content of courses that are transferred between postsecondary institutions such as TAFE institutes, colleges or universities.
An executed agreement is essentially a legal document that has been signed by the people necessary for it to be made effective. If there is a contract between two people, for example, that indicates a service that needs to be provided by one party to the other, then it usually needs to be signed by both people.