Dental review; devoted to the advancement of dentistry. . ay of packing in the moldine is to employ amatrix of polished steel which must fit accurately at the cervix, andmust not be too high for the bite. This I hold in position by meansof a wooden wedge or a special metal clamp. I then oppose on theside facing the cavity a strip of rubber band measuring about 1 thickness. This strip I select from my stock, so that it will fitsnugly to the floor and side walls of the cavity. I oil the rubber and ORIGINAL COMMUNICATIONS. 129 when the moldine has been put in as described above in the remai
Dental review; devoted to the advancement of dentistry. . ay of packing in the moldine is to employ amatrix of polished steel which must fit accurately at the cervix, andmust not be too high for the bite. This I hold in position by meansof a wooden wedge or a special metal clamp. I then oppose on theside facing the cavity a strip of rubber band measuring about 1 thickness. This strip I select from my stock, so that it will fitsnugly to the floor and side walls of the cavity. I oil the rubber and ORIGINAL COMMUNICATIONS. 129 when the moldine has been put in as described above in the remain-ing space, I remove the rubber strip, making sure that the wall edgesare free; slightly oil all the parts, not omitting the occluding teeth,and now I am ready to pour. This is best accomplished with a hot spatula, or perhaps betterstill by means of a specially constructed wax syringe possessing a thinand flattened nozzle, which in the case of an upper tooth, will allowthe wax to be forced straight home to the highest point in the cavity, Fig. i Fig. d. thus expelling all the air. If, however, some bubbles should stillappear on the surfaces these are easily punctured with the hot metalnozzle and filled up. The wax is kept melted in readiness in a specialswinging twin-trough over a gas or spirit flame, which also holdsthe syringe, allowing it to be kept hot at the same time. While the wax mass in the tooth is still soft, I request the patientto bite. I then trim in the usual way, taking care, however, not to 130 THE DENTAL REVIEW. displace the matrix, otherwise the moisture will penetrate and dis-order the moldine lying underneath. Now we reach an interesting point in our work. The sprue wire,with which you are all acquainted, instead of only just penetratingthe layer of wax, is selected long enough and pointed so that we canpush it, when hot, through the moldine as high up and in the direc-tion of the axis of the tooth as the cavity will allow. I then thor-oughly cool the mode
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