A practical treatise on mechanical dentistry . e impression is then thoroughly coated with sandarac varnish,after which it is dipped for a moment in water and filled with a wetmixture of one part marble-dust with two parts of plaster, usinggreat care to perfectly fill the caps and molds of the teeth. Waituntil this mixture has become quite hard, remove the cup, and witha suitable knife clip off the plaster without marring the cast; securea good articulating impression, and transfer it to the cast to obtainan exact reproduction of the relative occlusions of all the teethinvolved. With such an a
A practical treatise on mechanical dentistry . e impression is then thoroughly coated with sandarac varnish,after which it is dipped for a moment in water and filled with a wetmixture of one part marble-dust with two parts of plaster, usinggreat care to perfectly fill the caps and molds of the teeth. Waituntil this mixture has become quite hard, remove the cup, and witha suitable knife clip off the plaster without marring the cast; securea good articulating impression, and transfer it to the cast to obtainan exact reproduction of the relative occlusions of all the teethinvolved. With such an articulation in hand, and with the meansalready described for swaging gold or platinum plate to fit thecusps and articulating surfaces of either the natural or artificialteeth, it should be within the capacity of any competent dentist tocomplete a suitable bridge, although there are practical points thatcan only be imparted by clinical instruction and actual demonstra-tion in the mouth. Such a bridge is shown in position in Fig. 562. Fig. The Mandrel System.—The following description of A Sys-tem of Crown- and Bridge-work is given by the experts of theS. S. White Manufacturing Co., who have designated it as TheMandrel System : An examination of a large number of human teeth shows that,no matter how great differences may exist in the apparent shapesof the crowns of individual teeth of a given class, there is a remark-able uniformity in the configuration of their necks. That is, thenecks of upper cuspids, for instance, were found to have a fixedtype, from which the variations were very slight as to shape, thoughthere appeared to be no exact standard of size. So of the otherclasses, with the single exception of the superior molars, in whichtwo distinct forms were found, the first being those in whichthe buccal roots were wider than the palatal; the second, those inwhich the reverse condition was found, the single palatal root beingwider at its junction with the crown than t
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
