. The Dental cosmos. hen bedirected to the perforation. It is herethat the advantages of copper amalgamover any other material are made evident,as owing to its plasticity it can be readilyand easily adapted to the tissues under-lying the lesion without danger of dis-placing them; besides, it is non-irri-tant, insoluble, antiseptic, and becomeshard and resistant within a reasonabletime, and capable of bearing considerablepressure without being readily displaced. If the canal is not already sufficiently large, it should be further reamed out,care being taken not to encroach uponthe perforation,
. The Dental cosmos. hen bedirected to the perforation. It is herethat the advantages of copper amalgamover any other material are made evident,as owing to its plasticity it can be readilyand easily adapted to the tissues under-lying the lesion without danger of dis-placing them; besides, it is non-irri-tant, insoluble, antiseptic, and becomeshard and resistant within a reasonabletime, and capable of bearing considerablepressure without being readily displaced. If the canal is not already sufficiently large, it should be further reamed out,care being taken not to encroach uponthe perforation, and the enlargementshould be increased at the proximal endof the root, with the object of obtainingas good a view of the perforation as pos-sible without unduly weakening the apex having been filled, a smallquantity of thin copper amalgam shouldbe carried to the end of it, and a taperedsteel instrument gently pushed throughthe soft amalgam till it reaches the seal-ing material. This should be worked Fig. Steel pin in canal with copper amalgamaround about and filling false canal toperforation in side of root. with an even rotary motion, so as tospread the copper amalgam evenlyaround the interior of the canal, whenit can be withdrawn, and a steel or Ger-man-silver dowel, slightly coated withwax and sufficiently long to project alittle way from the canal, should be car-ried to the apex, and then copper amal-gam gently tamped around between thedowel and the walls of the canal, so asto fill it up completely, care being takennot to use sufficient pressure to push thecopper amalgam beyond the perforation(Fig. 51). The case may now be leftfrom twenty-four to forty-eight hours,to allow the copper amalgam to becomethoroughly hard, when the temporarydowel may be easily withdrawn afterslight heating by means of a hot instru-ment applied to it. Should nothing more than slight dis- GIRDWOOD.—TUBE TEETH AND PORCELAIN RODS. 819 comfort follow—and there ought to benone if the
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