Intra-oral Parallel
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- Similar to conventional radiography
- Target teeth situated parallel to film with x-ray beam at 90
degrees to film
- Film focal distance 15-20 mm
- Used for mandibular cheek teeth.
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Intra-oral Bisecting Angle
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- Requires three angles
- Angle of film
- Angle of long axis of tooth
- Angle that bisects a) and b) = Bisecting Angle
- Used for all incisors, canines and maxillary cheek teeth.
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Extra-oral Near Parallel Technique
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- Techniques with the film outside the mouth as close to parallel
to the target teeth as possible
- Beam direction aims to be close to vertical, but to avoid superimposition
of upper tooth roots and zygomatic arch.
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Other Extra-oral Techniques
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- Uses either DV, VD or lateral oblique views with mouth held
open and head held at approximately 45 degrees to film
- Used when large lesions require to be imaged
- Useful to image TMJ's.
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