A text-book of dental histology and embryology, including laboratory directions . Diagram of enamel rod directions, from a photograph of a buccolingual section ofan upper bicuspid. occlusally from this point, they incline more and moreocclusally until in the occlusal third they reach an inclina-tion of 18 to 20 centigrades occlusally from the horizontal. The rods which form the tip of the buccal cusps do notreach the tip of the dentine cusp, but the buccal slope of 68 DIRECTION OF ENAMEL RODS IN TOOTH CROWN the dentine. This becomes important, as will be seen the tip of the dentine
A text-book of dental histology and embryology, including laboratory directions . Diagram of enamel rod directions, from a photograph of a buccolingual section ofan upper bicuspid. occlusally from this point, they incline more and moreocclusally until in the occlusal third they reach an inclina-tion of 18 to 20 centigrades occlusally from the horizontal. The rods which form the tip of the buccal cusps do notreach the tip of the dentine cusp, but the buccal slope of 68 DIRECTION OF ENAMEL RODS IN TOOTH CROWN the dentine. This becomes important, as will be seen the tip of the dentine cusp the rods are in the axialplane, but in this position they are usually very muchtwisted. Passing down the lingual slope, they become moreand more inclined lingually from the mesiodistal axial plane, Fig. 30. Diagram of enamel rod directions, drawn from a mesiodistal section of a bicuspid. and the degree of inclination is related to the height ofthe cusp—the taller the cusp the greater the inclination. Atthe developmental groove or pit they meet the rods of thelingual cusp, which are inclined in the opposite direction. In a mesiodistal section (Fig. 30) the plan of arrangementwill be seen to be the same, the tip of the marginal ridgecorresponding to the tip of the cusp. In an incisor the THE GENERAL DIRECTION OF ENAMEL RODS Fig. 31
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectteeth, bookyear1912
