. The science and practice of dental surgery. ?C ing only applies to the molar band, the caninenot requiring it (see Fig. 772). The sweatingof the edges together instead of soldering isdesirable, and may be described here. Theend of the band A (see Fig. 773), after beingbent roughly round the plaster root, is chamferedat B, to about the extent of the thickness ofthe gold. At C it is also chamfered, but on Fig. 771. hardness as coin gold rolled into plate form jiji^inch thick is the best to use (about size 4, Ash);it is hard and a good colour, and, as will be seenlater, solders that work well w
. The science and practice of dental surgery. ?C ing only applies to the molar band, the caninenot requiring it (see Fig. 772). The sweatingof the edges together instead of soldering isdesirable, and may be described here. Theend of the band A (see Fig. 773), after beingbent roughly round the plaster root, is chamferedat B, to about the extent of the thickness ofthe gold. At C it is also chamfered, but on Fig. 771. hardness as coin gold rolled into plate form jiji^inch thick is the best to use (about size 4, Ash);it is hard and a good colour, and, as will be seenlater, solders that work well with it can be madewith the scrap. A piece of the right lengthhaving been cut off, and of sufficient depth toallow for fitting, it is annealed, bent round themodel, and either soldered or sweated, and then. the reverse side. These ends are then sprung against each other into perfect contact all along ;to do this only requires a little knack, straightends to the band, and perfectly flat bevels ofthe same width, made by a flat fine-cut file. 61i A small amount of liquid flux (sorosis isone of the best varieties) is then run betweenthe ends, and the point of the blowpipe appliedto the gold at the edge that is not going to befitted to the root (see Fig. 774), and as soon as thegold sweats at this point the flame is runfirmly along the line of junction, just as ifthere were solder there, until the metal fusesall along. A small pointed blue flame {and nodraught of any sort to divert it) is necessary,and the gold must be well fused at the point ofcommencement, and the whole thing donewith one sweep of the flame; otherwise oxida-tion takes place and the band has to be carefullypickled and refluxed before the edges can befurther united. The ends need not be cham-fered , but it gives a much better
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
