. Elementary and dental radiography / by Howard Riley Raper . 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 Fig. 416. Showing how the angle of the X-rays may make the buccal roots of uppermolars seem much shorter than the lingual. olars seem much shorter than the Ungual. The thickness of the tooth, bucco-lingually, governs to a great degreethe possibility of distortion in such a manner as to cause a canal fillingwhich reaches the end of the root to have the appearance of failing todo so. Thus the mesio-
. Elementary and dental radiography / by Howard Riley Raper . 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 Fig. 416. Showing how the angle of the X-rays may make the buccal roots of uppermolars seem much shorter than the lingual. olars seem much shorter than the Ungual. The thickness of the tooth, bucco-lingually, governs to a great degreethe possibility of distortion in such a manner as to cause a canal fillingwhich reaches the end of the root to have the appearance of failing todo so. Thus the mesio-buccal canal of lower molars as well as the buccalcanal in upper bicuspids is especially liable to this distortion (Fig. 415). READING RADIOGRAPHS 373 while the more cone-shaped roots (roots narrow from facial to lingual attheir apices) are almost free from the liability of such distortion. 16. Without Taking Into Account the Angle at Which theX-rays Were Directed Toward the Tooth and Film, to AssumeThat the Buccal Roots of Upper Bicuspids and Molars Are MuchShorter Than the Lingual Roots of the Same Teeth. Figure 416 diagrammatically illustrates why the buccal roots some-times appear so much
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