I work 3 days a week. Non-exposure side of receptors on the top row with exposure side on the bottom row.
If the receptor is too large for the area, bending can also occur. In other words, for the maxillary arch, the positive angulation must be increased PID pointing down ; for the mandibular arch, the negative angulation must be increased PID pointing up. Round Cone Cut.
Foreshortening Foreshortening or shortening of the teeth and surrounding structures can also result from improper vertical angulation. The principles and technique are the same except for preparing the sensor.
If the patient, film or x-ray tube is moving during the exposure, blurring of the image may result. I place the film on the first molar and ask the pt to close all the way together. When assembling these devices, make certain that the entire receptor can be seen while looking through the indicator ring. As with anything the more you do it the easier it will be.
The unexposed portion of the film is clear and follows the shape of the outline of the PID, so that a clear semi-circular image is seen on a portion of the film. This error can also occur if the receptor is not placed parallel to the long axis of the teeth.
X-rays are electro-magnetic waves, a type of radiation beyond the visible spectrum that can penetrate living tissue. The central ray should be aligned over the center of the receptor with the x-ray beam directed perpendicular to the receptor.
Usually the mandibular canine is more mesial unless a class II occlusion so make sure you use the most mesial canine as the judge. Authored by:. Placing the receptor more lingual to the teeth where the palate and floor are deeper will make placement easier and more comfortable for the patient.
This method assures that I will get all the molars including the 3rds if they are there. If your film is placed correctly this is the last step to avoid overlap. When this occurs, the occlusal plane will appear crooked. Backwards placement is less likely with rigid digital receptors because of the wire attachment on the non-exposure side of the sensor. Longer intervals between bitewing x-ray examinations are indicated when the risk of caries tooth decay and periodontal disease is low.
Dear Doctor, its employees and its Editorial Advisory Board do not endorse any of the procedures or technologies presented on this site. Elongation Elongation or lengthening of the teeth and surrounding structures results from underangulation of the x-ray beam.