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.
Selecting a Dentist for an Inlay or Onlay. There is no formal training offered for porcelain inlays and onlays in dental school and the number of continuing education courses is limited. As a result, there are a relatively small number of dentists who perform this type of inlay and onlay procedure.