. The principles and practice of dental surgery. to admit the rivets of the teeth. After having punched one hole,a rivet is inserted; then, by moving the strip of gold plate twoor three times to the right and left, a mark will be left upon it,indicating the distance the rivets are apart. But previously tothis the rivets should be made parallel, (being very careful not ADJUSTMENT OF PORCELAIN TEETH. 691 to strain them in the tooth,) and the ends filed off level. Other-wise the pins will not go into the holes punched, and there willbe an uncertainty as to which side of the pin the mark on thepla
. The principles and practice of dental surgery. to admit the rivets of the teeth. After having punched one hole,a rivet is inserted; then, by moving the strip of gold plate twoor three times to the right and left, a mark will be left upon it,indicating the distance the rivets are apart. But previously tothis the rivets should be made parallel, (being very careful not ADJUSTMENT OF PORCELAIN TEETH. 691 to strain them in the tooth,) and the ends filed off level. Other-wise the pins will not go into the holes punched, and there willbe an uncertainty as to which side of the pin the mark on theplate corresponds. Dr. Samuel Mallet has very ingeniously invented a punch whichwill save much trouble in finding the proper position of the secondhole. (Fig. 231.) After straightening the pins, one is placed in Fig. the hole ^, at the head of the punch, the other pin pressing outthe movable punch e, (which works by the spring g,) until itslips into the slot h: the two punches /, e, then make the holesat the exact distances apart to receive the pins. The holes should be slightly countersunk on both sides, andafter placing the backing on the tooth, it is made fast by split-ting with a strong knife or a wedge-shaped excavator, the endsof the platina rivets, or pinching them together with pliers. Ifthe ends of the platina rivets are hammered so as completely tofill the holes in the backings, it will prevent the solder fromflowing in and uniting the two as firmly as it should do. Thebackings may be slightly hollowed before they are put on. Bydoing this they will fit up closely to every part of the back ofthe tooth After the backings have been made fast to the teeth, they areto be accurately fitted to the plaie, standing off from the plateenough for a very thin piece of watch-spring to be pas-ed under.
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Keywords: ., bookcentury1800, bookdecade1860, bookpublisherphiladelphialindsa
