1. A thin metal rod used to provide fixation for bones in the treatment of fractures.
2. A thin metal rod used in dentistry as an aid to retention. Pins used to retain a restoration or core may be cemented, friction-retained by the elasticity of the dentine, or self-threaded utilizing a pre-drilled hole. Dentine pin See dentine. An incisal guide pin is a vertical metal rod which maintains the vertical dimension on an articulator; it is attached to the upper part of the articulator and rests on the incisal guide table.