. Elementary and dental radiography / by Howard Riley Raper . ic appearanceof doing so. Figure 413 diagramatically illustrates how, byTi8$. 413 and 414. changing the angle at which the X-rays are directed through the parts onto the film, a canal filling whichreaches the end of the root may appear to reach the end or to fall shortof reaching the end. With the X-rays directed as lines A and B indicate,the canal filling, as it appears on the radiograph, will not reach the endof the root; with the rays directed as indicated by the unmarked lines, the 37^ APPENDIX resulting radiograph will show the
. Elementary and dental radiography / by Howard Riley Raper . ic appearanceof doing so. Figure 413 diagramatically illustrates how, byTi8$. 413 and 414. changing the angle at which the X-rays are directed through the parts onto the film, a canal filling whichreaches the end of the root may appear to reach the end or to fall shortof reaching the end. With the X-rays directed as lines A and B indicate,the canal filling, as it appears on the radiograph, will not reach the endof the root; with the rays directed as indicated by the unmarked lines, the 37^ APPENDIX resulting radiograph will show the canal filling reaching to the end ofthe root. The lines marked A and B then may be considered to represent anincorrect angle for the X-rays, while the unmarked lines represent thecorrect angle. However, when the apical foramen happens not to be inthe bucco-lingual center of the root, but stands somewhat to the buccal,what would ordinarily be the correct angle for the rays will cast the shad-ow of the canal filling short of the extreme apical end. Fig. Fig. 415. Showing how the canal filling in the mesio-buccal root of a lower molar mayseem not to reach the end of the root when it does.
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