A practical treatise on mechanical dentistry . of the this hardens sufficiently, the wax or shellac is removed,which permits the sections of the plate to be taken up line of the fracture is now cut out or enlarged upon eitherside with a large bur revolved by the dental engine, or it may be RUBBER OR VULCANITE BASE. 321 accomplished with a file or saw. Dovetails are then cut on eitherside with a jewelers saw, and the sections replaced upon the work at this stage is shown in Fig. 138. The opening between the two halves and the dovetailed spacesare then covered
A practical treatise on mechanical dentistry . of the this hardens sufficiently, the wax or shellac is removed,which permits the sections of the plate to be taken up line of the fracture is now cut out or enlarged upon eitherside with a large bur revolved by the dental engine, or it may be RUBBER OR VULCANITE BASE. 321 accomplished with a file or saw. Dovetails are then cut on eitherside with a jewelers saw, and the sections replaced upon the work at this stage is shown in Fig. 138. The opening between the two halves and the dovetailed spacesare then covered with wax, the case invested in a flask in theusual way, the flask reopened, and wax removed. The spacebetween the two halves, with the dovetailed spaces, are then care-fully packed with rubber, when it is vulcanized and finished in theusual way. The whole subject of repairing rubber plates is so fully andclearly described by Dr. George B. Snow, in an article entitled, Repairing Vulcanite Plates, that his processes are here given in Fig. detail. The writer would premise that he has long since abandonedthe older method of under cutting in repairing rubber plates,and would emphasize what is stated by Dr. Snow, that perfectunion can be obtained in such cases if the surfaces of contact arefreshly cut, absolutely clean, and properly roughened. It is not unusual to see vulcanite plates which have been crackedor broken, and repaired by what may be termed the hole andplaster system. Holes are drilled through the plate along theedges of the crack, and a new thickness of rubber superimposedupon a mass which, possibly, is already too thick for comfort orconvenience, the old crack still remaining as a weak point to occa-sion further breakage. No advantage was taken of any possibility 322 MECHANICAL DENTISTRY. of union between the old and new material, the dentist having beenobviously ignorant of the fact that perfect union can be obtained insuch cases if the surfaces of contact are f
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
