Dental forceps with spherical pivot surfaces - which enable jaws of forceps to align themselves with tooth

摘要

The forceps is used for extracting a tooth consists of two arms (8,13) pivoted together with jaws formed at one end of each arm and with the other ends of the arms forming the handle. The pivot is formed by a bolt (7) which passes through a hemispherical boss (16) in one of the arms. This hemispherical boss fits in a hemispherical recess formed in the other arm. The underside of the bolt head has a concave spherical surface (18) which abuts against a matching convex spherical surface (17). These spherical surfaces (17,18) are concentric with the other spherical surfaces (15,16) so that one arm can swing about the centre (22) of these surfaces, relative to the other arm. This feature enables the jaws of the forceps to align themselves with the contours of the tooth being extracted. USE - Dentistry. Tooth extraction forceps.