Paralleling Technique Dental radigraphy advantages and disadvantages

Paralleling Technique Dental radiography advantages and disadvantages

Paralleling  Technique (Advantages)

There  are two techniques for  taking periapical films,  the paralleling and  the bisecting angle  techniques. When comparing  the two techniques,  the advantages of the  paralleling technique are:

1. Better dimensional accuracy: the paralleling technique results in less distortion of the image of the teeth. (The shape of the teeth and the relationship of the teeth to surrounding structures is more accurate).

2. When using the paralleling instrument with the aiming ring, the alignment of the x-ray beam is simplified.

3.  It is easier to standardize films. Because you are using the positioning instrument, it is easier to position the film in approximately the same position at different appointments. This can be helpful if you are trying to compare the appearance of a periapical lesion from one visit to the next.

4. Head position is not as critical. Because of the paralleling instrument, with its aiming ring, it is easy to properly align the x-ray beam no matter how the head is positioned.

When  the long axis of  the film is parallel  with the long axis  of the tooth, the  image of the tooth  on the film looks  the same as the  tooth itself (no distortion).  The image will be  slightly larger than  the actual tooth (magnification),  but the shape is  the same.

Paralleling  Technique (Disadvantages)

When  comparing the paralleling  and bisecting angle  techniques, the paralleling  technique is:

1. Less comfortable. Because the film is usually more upright when using the paralleling technique, it impinges more on the palate or floor of the mouth, thus making it more uncomfortable.

2. More limited by the anatomy of the patient’s mouth. A shallow palate or floor of the mouth makes it harder to position the film using the
paralleling technique.

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Category: Endodontics