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.
Cosmetic dentistry treatments currently in use include: 1  Inlays/Onlays: Also known as indirect fillings, inlays and onlays made from porcelain or composite materials are a long-lasting yet aesthetically pleasing way to provide a filling to teeth with tooth decay or similar structural damage.