Principles and practice of operative dentistry . ups or thin soft rubber wheelscharged with fine pumice. Approximal fillings in bicuspids and molars, because of the difficulties ofapcess which are presented by their position, make them the most trouble-some of all fillings to finish. It therefore is necessary that the greatestcare be exercised in this process, and that the cervical border receive par-ticular attention. Fillings which have been placed in those locations with-out the aid of a close-fitting matrix usually present a considerable over-lapping of the gold at the cervical border. The
Principles and practice of operative dentistry . ups or thin soft rubber wheelscharged with fine pumice. Approximal fillings in bicuspids and molars, because of the difficulties ofapcess which are presented by their position, make them the most trouble-some of all fillings to finish. It therefore is necessary that the greatestcare be exercised in this process, and that the cervical border receive par-ticular attention. Fillings which have been placed in those locations with-out the aid of a close-fitting matrix usually present a considerable over-lapping of the gold at the cervical border. The success of the filling,other things being equal, will depend largely upon the perfection withwhich the cervical margin is trimmed and finished. In those cases where a properly adjusted matrix has been used, thelabor of trimming the margins and finishing the surface will be found tobe greatly lessened. The pointed, right and left, curved files of Dr. Meriam, shown in , will greatly facilitate the work of removing the overlapping edges of. Fig. 446. gold at the cervical margin, and, supplemented with the trimmers justmentioned, will enable the operator to give the desired form to the surfaceof the filling. The final finishing can be accomplished with emery tape,sand-paper strips, etc., after the manner de-scribed above, or with emery cloth or sand-paper and cuttle-fish disks mounted uponsuitable mandrels for use with the dentalengine. These disks are made of varioussizes, some of them having only a narrow rimof grit, the balance of the disk being plain(Fig. 446). The latter are valuable for polish-ing the cervical margin of contour approximalfillings, as it enables the operator to do this without cutting away the con-tour of the filling at the morsal border. Fig. 447 shows two of the popularforms of mandrels for carrying these disks.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1901
