Principles and practice of operative dentistry . lingual wall, for the sake of the cosmetic eifect, shouldbe sacrificed in preference to the labial, as gold fillings upon the labial sur-faces are at the best blemishes which seriously mar the beauty of thenatural tooth. On the other hand, if the cavity is large and the labialwall is much weakened, the success of the filling, and perhaps the salva-tion of the tooth, will depend upon the thoroughness with which thisweakened wall is removed ; but, nevertheless, care should be exercised notto remove more than is necessary to obtain strong margins.
Principles and practice of operative dentistry . lingual wall, for the sake of the cosmetic eifect, shouldbe sacrificed in preference to the labial, as gold fillings upon the labial sur-faces are at the best blemishes which seriously mar the beauty of thenatural tooth. On the other hand, if the cavity is large and the labialwall is much weakened, the success of the filling, and perhaps the salva-tion of the tooth, will depend upon the thoroughness with which thisweakened wall is removed ; but, nevertheless, care should be exercised notto remove more than is necessary to obtain strong margins. Large cavities often come dangerously near to the pulp ; great careful-ness should therefore characterize the work of their preparation, that thisorgan may not be exposed by an unneccessary sacrifice of sound dentin. Small chisels will be found most useful in opening all simple proximalcavities, while small hatchet excavators having bayonet-shaped shanks, andcow-horn spoons, as shown in Figs. 345 and 346, will, as a rule, gain access Fig. to all parts of the cavity and permit the ready removal of the decayeddentin. Bound burs of suitable sizes will be best adapted for trimming andshaping the cervical margin of the cavity, which should be so prepared asto leave a strong and but slightly under-cut or perfectly flat wall, carebeing taken, if the cavity reaches the cervix, not to leave a narrow rimof enamel which would be likely to be fractured in condensing the goldagainst it. The enamel margins should always be carefully bevelled withsmall chisels and polished with file-cut burs and Arkansas stones. All THE CLASSIFICATION OF CAVITIES. 275 Fig angles should be rounded with chisels, burs, or stones. Fig. 347 and Plate XI,D, E, represent the prepared cavity. Retentive shaping of these triangular-formed cavities requires that threepoints of anchorage be obtained, two at the base of the triangle in the anglesand one at the apex. These may be formed by deepening theangles at the
Size: 1840px × 1358px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
