Porcelain is fused to an underlying metal structure to provide strength to a filling, crown or bridge. Alloy of gold, copper and other metals resulting in a strong, effective filling, crown or bridge. Alloys of non-noble metals with silver appearance resulting in high strength crowns and bridges.orcelain is fused to an underlying metal structure to provide strength to a filling, crown or bridge. Alloy of gold, copper and other metals resulting in a strong, effective filling, crown or bridge. Alloys of non-noble metals with silver appearance resulting in high strength crowns and bridges.
Limit refers principally to the establishment of a maximum beyond which a person or thing cannot or may not go: The Constitution limits the president's term of office to four years. To restrict is to keep within prescribed limits, as of choice or action: The sale of alcohol is restricted to people who are 21 and older.
Webster Dictionary(0.00 / 0 votes)Rate this definition: Boundary(noun) that which indicates or fixes a limit or extent, or marks a bound, as of a territory; a bounding or separating line; a real or imaginary limit.