The
bisecting angle technique is used when the sensor cannot be placed parallel to the long axis of the tooth. The sensor is positioned at an angle behind the tooth in question. An imaginary line bisects the angle formed by the long axis of the tooth and the film. The x-ray beam is aimed at a right angle to that imaginary line.The bisecting technique refers to the placement of the film and the location of the x-ray head in relation to the bisecting angle which is
half way between the angle of the x-ray film and the long axis of the tooth.
The bisecting angle technique is accomplished by placing the receptor as close to the tooth as possible. The central ray of the x-ray beam should be directed perpendicular to an imaginary line that bisects or divides the angle formed by the long axis of the tooth and the plane of the image receptor.
The
bisecting angle minimizes distortions of the teeth. The bisecting angle is used for the anterior teeth, maxilla, and mandible, the posterior maxilla teeth. In this technique, the beam is aimed at the imaginary line bisecting the plane of the tooth and the plane of the film.Using this technique, a true image of the tooth length and width is obtained. Principle In any
90-degree arc, there is one angle that will allow an x-ray beam to cast an accurate shadow of the tooth on the film.
