. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . the disto-lingual lobe, location of thefifth cusp on _6_ and shape of the angles. Indicate by lettersthe ridges, fossae, lobes and grooves. 14. The entrance to the canals on the floor of the pulpchambers of upper molars is situated at the corners of animaginary triangle known as the Molar Triangle (Fig. 23).Draw three triangles, one to represent each upper molar, rightside, showing the difference in the shape and size of the tri-angles, due to diminution in the size of the teeth and chang
. Operative and dental anatomy technics; a class-room and laboratory manual for freshmen dental students . the disto-lingual lobe, location of thefifth cusp on _6_ and shape of the angles. Indicate by lettersthe ridges, fossae, lobes and grooves. 14. The entrance to the canals on the floor of the pulpchambers of upper molars is situated at the corners of animaginary triangle known as the Molar Triangle (Fig. 23).Draw three triangles, one to represent each upper molar, rightside, showing the difference in the shape and size of the tri-angles, due to diminution in the size of the teeth and change oflocation of the disto-buccal canal. Indicate by letters on thedrawings the location of each individual canal. 15. Draw three cubical figures and place the mesial anddistal roots of a lower molar at their bases (Fig. 24). Indicate DRAWINGS 21 by letters the location of the surfaces, margins, line and pointangles of a lower molar. 16. Draw and shade the buccal surface of | 6 and | 7 , show-ing crown and roots (Figs. 25 and 26). 17. Draw and shade the mesial surface of crown and rootsof 6 (Fig. 27).. Fig. 24.—Diagrammatic drawing to show the surfaces and line and point angleson lower molars. First Diagram.—A, Mesial surface; B, buccal surface; C, occlusal surface. Second Diagram.—Line angles. A, Mesio-lingual angle; B, octiuso-lingual angle;C, disto-occlusal angle; D, bucco-occlusal angle; E, mesio-occlusal angle; F, disto-buccal angle; G, H, gingival line. Third Diagram.—Poi7it angles. A, Mesio-linguo-occlusal; B, mesio-bucco-occlusal; C, Disto-linguo-occlusal; D, dislo-bucco-occlusal; E, disto-bucco-gingival;F, mesio-bucco-gingival; G, mcsio-Hnguo-gingival point angles. 18. Draw a trapezoidal figure, Fig. 28, and outline occlusalsurface of I (i , indicating location of the ridges, grooves andlobes. 19. Draw a parallelogram, Fig. 29, and outline the oc-clusal surface of 7 |, indicating the location of the ridges,grooves and lobes. 22 DENTAL ANATOMY
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