. The principles and practice of dental surgery. the platina may keep the teeth from shifting their whole time occupied in heating and backing a tooth isabout half an hour, and when several are done at once, a littlelonger. 604 SOLDERING PORCELAIN TEETH. Instead of using the strip of platina plate to prevent the teethfrom becoming displaced, in case the plaster cracks, thin sheetiron or iron wire may be used; but platina is undoubtedly theneatest and has the advantage of being indestructible; it may benarrow and thin, so that its cost would form no objection to itsuse. Mr. Wilsons m
. The principles and practice of dental surgery. the platina may keep the teeth from shifting their whole time occupied in heating and backing a tooth isabout half an hour, and when several are done at once, a littlelonger. 604 SOLDERING PORCELAIN TEETH. Instead of using the strip of platina plate to prevent the teethfrom becoming displaced, in case the plaster cracks, thin sheetiron or iron wire may be used; but platina is undoubtedly theneatest and has the advantage of being indestructible; it may benarrow and thin, so that its cost would form no objection to itsuse. Mr. Wilsons method might be improved, first, by com-pletely fitting the tooth before backing; secondly, by runningthe thin platina slip, one eighth of an inch down on the plate, toany irregularities of which it can be quickly burnished down bymaking several slits in the edge. This would secure a very per-fect and strong attachment to the plate. A piece invested preparatory for soldering and placed upon alump of solid charcoal, is seen in Fig. 232. Fig. Directions for aj)plying and solder have already beengiven. Some cut the solder into very small pieces; others useone piece to each tooth at its , and a second for the pins un-less previously soldered. If the backinjrs are soldered to the FINISHING PROCESS. 695 teeth beforehand, a more fusible grade of solder should be usedat the second soldering. The work, as before stated, must be gradually and thoroughlyheated up before directing the flame upon the plate or backings. The last point to be touched with the flame is the solder, andthis not before a slight melting of the edge shows that it is juston the point of flowing. If every preparation for soldering hasbeen properly made, the actual flowing of the solder on a fullpiece will take less than a minute, and will be so smooth as to re-quire no other finish than the Scotch-stone, and polishing soldering being completed, the cover should be placed uponthe soldering p
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