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.
Both inlays and onlays are pre-formed in a lab before being bonded to the damaged or decayed tooth. The difference of use depends on the amount of tooth structure that has been lost to wear or decay. Your dentist will help you decide which is most appropriate for you. An inlay fits within the grooves that are within the cusps of your teeth. An onlay, the larger of the two, fits within the grooves but wraps up and over the cusps covering more of the tooth's surface.