A practical treatise on mechanical dentistry . adraw-plate, a vise, and a pair of flat-nosed pliers. A draw-plate(Fig. 45) is an oblong piece of steel, pierced with a regular grada-tion of holes, or a series of progressively diminishing apertures,through which the gold bar, reduced to a rod, is forced and madeto assume the form and dimensions of the hole through which it 96 MECHANICAL DENTISTRY. is last drawn. The holes are formed with a steel punch, and areenlarged on the side where the wire enters and diminish with agradual taper to the other side. A draw-bench is sometimes em-ployed in exte
A practical treatise on mechanical dentistry . adraw-plate, a vise, and a pair of flat-nosed pliers. A draw-plate(Fig. 45) is an oblong piece of steel, pierced with a regular grada-tion of holes, or a series of progressively diminishing apertures,through which the gold bar, reduced to a rod, is forced and madeto assume the form and dimensions of the hole through which it 96 MECHANICAL DENTISTRY. is last drawn. The holes are formed with a steel punch, and areenlarged on the side where the wire enters and diminish with agradual taper to the other side. A draw-bench is sometimes em-ployed in extending the wire, the power being applied by atoothed-wheel, pinion, and rack-work, and is moved by the handsof one or two persons. For the purposes of the dentist, however,it will be sufficient to fix the draw-plate securely between the jawsof a bench-vise, and, by seizing hold of one end of the gold rodwith a strong pair of clamps or flat-nosed pliers, serrated or cutlike a file on the inside of the jaws, the wire may be drawn stead- FlG. ily through the plate, passing from the larger to the smaller holesuntil a wire of the required size is obtained. In drawing the wire, the motion should be steady and uniform,for if drawn interruptedly or by jerks, the wire will be marked bycorresponding inequalities. The gold rod should also be annealedfrom time to time, and the holes kept well greased or waxed. The process described above will answer equally well in reduc-ing any of the ductile metals to wire, as silver, copper, platinum,etc., so that any further description of the method, in connectionwith these metals, will be unnecessary. Method of Constructing Spiral Springs. — Inasmuch as spiralsprings have been, to a great extent, superseded by more ap-proved agencies employed in the retention of artificial teeth in FORMING GOLD ALLOYS FOR DENTAL USE. 97 the mouth, and as all the principal dental furnishing houses aresupplied with these appliances already prepared for use, it do
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
