A practical treatise on mechanical dentistry . which are being pressed down upon the collar, F, by the broad-surfaced and serratedFig. 403. instrument, K. This being accomplished, re-move the several pieces from the mouth, care-fully cement the collar in its proper positionrelative to the base-plate, which will now forma sort of matrix for it, again place in the mouth,readjust, harden the cement, remove from themouth, invest as before, and solder the collarand base-plate together, using a considerablePressing the base-plate f w f covering, so that the collar over the collar. fe may be still fu
A practical treatise on mechanical dentistry . which are being pressed down upon the collar, F, by the broad-surfaced and serratedFig. 403. instrument, K. This being accomplished, re-move the several pieces from the mouth, care-fully cement the collar in its proper positionrelative to the base-plate, which will now forma sort of matrix for it, again place in the mouth,readjust, harden the cement, remove from themouth, invest as before, and solder the collarand base-plate together, using a considerablePressing the base-plate f w f covering, so that the collar over the collar. fe may be still further strengthened and itssurface be made uniform. In cementing the collar to the base-plate one precaution isimperative—namely, not to allow a film of cement to get betweenthe collar and the tooth. If this is done and the investment pouredin upon this film of cement, the latter will immediately burn out assoon as heat is applied, leaving a space between the collar and theinvestment into which the gold solder will flow, and thus interfere. 5 l6 MECHANICAL DENTISTRY. with that perfect adaptation of the appliance to the tooth which isnecessary to a successful result. The mounting of the facing next demands attention. Asalready stated, a plain plate porcelain tooth is used. This musthave what are technically known as cross-pins; that is, pins placedat right angles with the long axis of the tooth. They must alsobe placed well up toward the cutting edge. If they are too nearthe neck they will inevitably be cut out in fitting the tooth to theslope of the base-plate on which it must be mounted. Fig. 404 shows the form of the facing and indicates the slopegiven it in fitting. The fitting process does not differ from thatordinarily employed with porcelain teeth; an impression may betaken and the work done on a cast, or the facing may be fitted tothe mouth. In either case it is in the mouth that the finer and finaladjustments as to height, contour, alignment, etc., must be perfected. T
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
