. The science and practice of dental surgery. to make some edges of the fresh piece «eld sothat it will not curl up when the condenser isapplied to the middle. Sucii a condenser asNo. 7 is excellent in building contour, wliiie aform like No. 5 has an advantage along wallsor margins. The direction of f(nve in condensing goldshould mostly be nearly, but not tiuite, parallelwith the long axis of the tooth. Force shouldalways be directed so as to drive the gold intothe cavity, and no force should at any time be Fig. -4 44. : against the walls and in the angles, whileannealed or fully cohesive gold
. The science and practice of dental surgery. to make some edges of the fresh piece «eld sothat it will not curl up when the condenser isapplied to the middle. Sucii a condenser asNo. 7 is excellent in building contour, wliiie aform like No. 5 has an advantage along wallsor margins. The direction of f(nve in condensing goldshould mostly be nearly, but not tiuite, parallelwith the long axis of the tooth. Force shouldalways be directed so as to drive the gold intothe cavity, and no force should at any time be Fig. -4 44. : against the walls and in the angles, whileannealed or fully cohesive gold forins the mainbody of the tilling. In all cases the cohesivegold should be tlirust firmly into the semi-cohesive with small pluggers where an angleor an undercut is to be filled. In buildingcontour larger pieces of gold may l)e used thanare permissible elsewhere. Such an instrumentas No. 8, or the Varney foot-plugger, is con-venient to pack or mould frcsii pieces to theform desired. Enough pressure should be used. used tending to loosen or move the filling fromthe cavity. This should be especially borne inmind when malleting upon the periphery of acontour, where a blow in the wrong direction,though unnoticed at the tinu, will move thefilling, causing it to leak and impart a stainedappearance to the tootii afterwards. Huildingalong the lingual wall should be kept in advance,as indicated in the lateral. Fig. 445. When tiioincisal undercut is reached, the small right-anglefor the lateral, or the No. 2 point for the central,will be suitable. Small jiellets of semi-cohesivegold followed by small pellets of coiiesive shouldbe forced in the lingual direction to wedgethe gold in the cavity and ct)nipletely till theretentive undercut. The last i)art of tiu cavityto be filled is indicated in the central, Fig. 445.[Previous to this stage the incisal )indere\it isentirely filled, the filling being tinis tinallylocked, and a cohesive surface being left toreceive further additions of gold
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
