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.
What is the difference between a dental inlay and a dental onlay? Inlays and onlays are essentially the same kind of restoration. Where they differ is in which portion of the tooth they cover. Dental inlays are effective in covering the space between cusps located at the center of the tooth.