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.
Advantages of Porcelain Inlays/Onlays. 1  The porcelain restoration can be colored perfectly to match the existing tooth and look completely natural. 2  Done correctly, porcelain inlays/onlays feel and function just like your natural teeth. 3  Porcelain inlays/onlays are stain resistant.