BISECTING ANGLE The film is placed as close as possible to the surface. Central ray is directed perpendicular to the imaginary bisector. Advantage – shorter exposure time, more patient acceptance cos we don’t need a beam aligner ring. Disadvatage – image distortion/ magnification is possible. Angulation problems maybe, coz beam aligner right.PARALELLING BEAM It is easy to place using a film holder. Central ray is perpendicular to both recptor & long axis of the tooth. To maintain the parallelism between the object & the film, - INCREASE TARGET TO OBJECT DISTANCE * Advantage – more accurate & Simplicity (no extra calculations required) Disadvantages – patient discomfort.

Ver todos los episodios