retention pin

retention pin,

a small metal pin that extends from a metal casting into the dentin of a tooth to improve the holding ability of a tooth restoration.

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pin,

n a small cylindrical piece of metal.

pin, cemented,

n a metal rod cemented into a hole drilled into dentin to enhance retention of a restoration.

pin, friction-retained,

n a metal rod driven or forced into a hole to enhance retention. It is retained solely by elasticity of dentin.

pin, incisal guide,

n a metal rod that is attached to the upper member of an articulator and that touches the incisal guide table. It maintains the established vertical separation of the upper and lower arms of the articulator.

pin, retention,

n the frictional grip of small metal projections extending from a metal casting into the dentin of the tooth.

pin, self-threading,

n a pin screwed into a hole prepared in dentin to enhance retention.

pin, sprue,

n 1. a solid or hollow length of metal used to attach a pattern to the crucible former.
n 2. a metal pin used to form the hole that provides the pathway through the refractory investment to permit the entry of metal into a mold.

pin, Steinmann,

n.pr a firm metal pin that is sharpened on one end; used for the fixation of fractures. It is sometimes passed through the maxilla or mandible to provide external points for attachment of upward-supporting devices.