The terminology used here is largely based on UK standard terms but they have been modified in an effort to make them more explicit straightforward and convenient so that often the name of the view shows how it is taken. Thyroid collars as shown in Figure 6.3 should be used in the few cases where the thyroid gland may be in primary beam. A rntgenbegran if a oblique lateral must indicate the exact region of the jaws required. The approximate atomic number of soft tissue is 7 Z3 343 and for Bone is 12 Z3 172 hence their apparent difference in radio density and the contrast between the various tissue sets on X-rays see Ch. Main indications The main clinical indications are: it shows off Tooth decay monitoring of tooth decay assessment of existing restoration assessment of periodontal status. The terminology used here is based broadly on the British Standards terms but they have been modified in an attempt to make them more explicit straightforward and practical so that often the name of the view indicates how it is taken.Thyroid collars as shown in Figure 6.3 should be used in those few cases where the thyroid may be in primary beam.An X-ray request for an oblique lateral must specify the exact region of the jaws required.The approximate atomic number for soft tissue is 7 Z3 343 and for bone is 12 Z3 172 hence their obvious difference in radiodensity and the contrast between the different tissues seen on radiographs see Ch.Main indications The main clinical indications include: Detection of dental caries Monitoring the progression of dental caries Assessment of existing restorations Assessment of the periodontal status.