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.
Contract modifications are of the following types: ( 1 a)Bilateral. A bilateral modification (supplemental agreement) is a contract modification that is signed by the contractor and the contracting officer. ( 2 b)Unilateral. A unilateral modification is a contract modification that is signed only by the contracting officer.