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.
Porcelain inlays/onlays are hard custom manufactured inserts that are usually placed in larger cavities and areas where there is less tooth structure. They are cemented in place to stop further decay, make the surrounding tooth/teeth structure more stable, and look like your natural teeth.