Dental review; devoted to the advancement of dentistry. . practically the same at the dentinal ends as at the periphery. Theouter circumference of the enamel being greater than the innernecessitates a filling in at the surface with shorter conically shapedrods. A point of some clinical importance. The direction of the rods will be found to vary in the differentpartfl of tin- tooth. (Fig. 3.) In the middle third of the crown theirdirection is nearly perpendicular to the surface; but passing out- ORIGINAL COMMUNICA TIONS. 17 wardly they diverge in both directions from the middle of the cr
Dental review; devoted to the advancement of dentistry. . practically the same at the dentinal ends as at the periphery. Theouter circumference of the enamel being greater than the innernecessitates a filling in at the surface with shorter conically shapedrods. A point of some clinical importance. The direction of the rods will be found to vary in the differentpartfl of tin- tooth. (Fig. 3.) In the middle third of the crown theirdirection is nearly perpendicular to the surface; but passing out- ORIGINAL COMMUNICA TIONS. 17 wardly they diverge in both directions from the middle of the is, in approaching the gingival the rods are directed apically(Fig. 4), and as they pass occlussally the angle of their directionwith the perpendicular becomes greater, until at the crest of thecusp they have assumed the direction of the long axis of the Fig. 2. These observations must be noted with care in preparing cavities onthe buccal surfaces of the teeth. Passing over the crest of the cusptoward the median groove the direction of the rods on the occlussalslope of the cusps reaches again the perpendicular to the enamelsurface. The question arises, how are we to determine their direction 18 THE DENTAL REVIEW.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
