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Intra-oral Parallel Technique - Mandible

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Introduction

This technique is commonly used for other parts of the body such as limbs and body cavities.

Principle

The film is located between the tongue and the lingual aspect of the target teeth. The beam is angled at 90 degrees to the film and the target. The target tooth/teeth should be in the middle of the film and the surrounding structures included, when important - for example, the ventral border of the mandible.

Comments

  • Very accurate but use is limited to mandibular molars and premolars 2, 3 and 4. An extra-oral technique is possible for the maxillary cheek teeth and mandibular premolar 1.
  • If the angle between the tooth and the film is more than 15 degrees, use the bisecting angle technique to prevent gross distortion of the image caused by increasing the Object Film Distance.
 

Parallel technique in mandible
Parallel technique in mandible

 
Position of dental film for parallel technique of lower carnassial
Position of dental film for parallel technique of lower carnassial
 

Radiograph of mandibular cheek teeth using parallel technique
Radiograph of mandibular cheek teeth using parallel technique

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