Dental review; devoted to the advancement of dentistry. . Fig. 10. that material is not so great. The amount of stress on these portionsof the teeth must be borne in mind. In the formation of the gingi- 24 THE DENTAL REVIEW. val border of the cavity, the direction of the prisms is frequentlyoverlooked, and a square base, or possibly a ragged one, is left, onlyto result in dislodging the short ends of the rods by the packingof gold, with the consequent result of gingival decay. The nearerwe approach the gingival the greater must be the angle of bevelwith the cavity wall. There is one class of c
Dental review; devoted to the advancement of dentistry. . Fig. 10. that material is not so great. The amount of stress on these portionsof the teeth must be borne in mind. In the formation of the gingi- 24 THE DENTAL REVIEW. val border of the cavity, the direction of the prisms is frequentlyoverlooked, and a square base, or possibly a ragged one, is left, onlyto result in dislodging the short ends of the rods by the packingof gold, with the consequent result of gingival decay. The nearerwe approach the gingival the greater must be the angle of bevelwith the cavity wall. There is one class of cavities where the lack of. Fig. 11. respect to enamel cleavage is felt most disastrously. I refer to theproximal cavities in the anterior teeth. In these teeth the platesof enamel are thin and the amount of dentine between them ne labial and gingival borders of these cavities are not often faulty,but the incisal and lingual are so frequently found defective that Ifed that the errand of my paper shall not be amiss if, in drawing ORIGINAL COMMUNICA TIOXS. 25 your attention to the histological features of the enamel, any newideas in the preparation of these cavities may be imparted. (Fig. n.) From this longitudinal section of an incisor, note the directionof the prisms in the incisive one-third. The enamel will cleave atsix to twelve centigrades from the perpendicular. Where the lin-gual plate of enamel is frail, with no supporting dentine, it shouldalways be cut away, and the margins so beveled as to cut off anyshort rods and permit the ends of those adjacent to the cavity to beprotected by the gold. Too
Size: 1460px × 1711px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
