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.
There are three main types of inlay/onlay material: Most inlays are now made of porcelain, as the desire for a more natural looking tooth increases and the ability to bond these restorations to your tooth improves. Gold is a truly fantastic material and has been used successfully for many years.