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6 Cards in this Set
- Front
- Back
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Parralleling technique |
The paralleling technique is also known as the extension-cone paralleling (xcp) right-angle or long cone technique |
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Five basic rules |
1. Film placement- The film must be positioned so that it will cover the correct tooth to be examined 2. Film position - film must be postioned parrallel to the long axis of the tooth. Film in the film holder must be placed away from the teeth and towards the middle of the mouth. 3. Vertical angulation - central of the beam must be perpendicular to the film and the long axis of the tooth 4. Horizontal angulation - central must be directed through the contact area between the teeth 5. Central ray - x-ray beam must be centered on the film to ensure that all areas of the film are exposed |
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Guidelines for film placement when using paralleling technique |
White side of the film alaways faces the teeth Anterior films are alaways placed vertically. Posterior films are always placed horizontally Id dot on the the film is always placed in the slot of the film holder. Film holder is always positioned away from the teeth and towards the midline of the mouth. Film is always parallel to the long axis of the tooth. |
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Discuss exposure sequence when exposing films using a parallel technique |
Anterior exposure sequence Assemble anterior xcp instrument Begin with maxillary Right canine Expose all maxillary anterior teeth from right to left end with maxillary left canine move to the mandibular arch Begin with the mandibular left canine expose all mandibular anterior teeth from left to right Finish with the mandibular right canine |
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Posterior exposure sequence |
Begin with the maxillary right quadrant Assemble the post xcp instrument Expose premolar film, then molar film Without reassembling the xcp instrument, move to the mandibular left quadrant Expose the premolar then molar Move to to maxillary quadrant and reassemble xcp instrument Expose premolar then molar Finish mandibular right quadrant Expose premolar then molar film
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Discuss FMX |
Contains both periapical and bitewing radiographs average adult fmx constains 18-20 films 14 PA 4-6 BW |
