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perpendicular bisector

The perpendicular bisector of a line segment AB is the straight line perpendicular to AB through the midpoint of AB.

angle

angle n.   Quick reference

A Dictionary of Dentistry

Reference type:
Subject Reference
Current Version:
2010
Subject:
Medicine and health, Dentistry
Length:
141 words

...in relation to the x-ray beam and x-ray film when taking extra-oral radiographs. The cavosurface angle in a prepared cavity is formed by the junction of the cavity wall with the surface of the tooth. The cusp angle is made by the slope of the cusp of a tooth with a perpendicular line bisecting the cusp. A line angle is formed at the junction of two tooth surfaces or two cavity walls; it is designated by the names of the walls forming the angle e.g. disto-buccal line angle. The angle of the mandible is formed by the junction of the ramus and the body....

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