Phencyclidine (PCP) was originally developed as an anesthetic, but the adverse side effects prevented its use except as a large animal tranquilizer. PCP acts as both a depress â¦ ant and a hallucinogen,and sometimes as a stimulant. It is abused primarily for its variety of mood-altering effects.
1 An inlay- As the name suggests, this restoration sits inside the tooth.  An onlay- In contrast is bonded on top of the tooth, replacing some or all of the cusps of the tooth.
Inlays are made from porcelain or gold, and help to hold the rest of the tooth together so that it can be used to bite and chew normally. Onlays. Dental onlays repair not only the chewing surfaces of back teeth, but also one or more of the cusps. The cusps are the raised points of the tooth located on the outer edges.