. The science and practice of dental surgery. tion, and form necessary for resistingstress (3). Gold alloyed with five per cent of platinumor coin silver, or reinforced with platino-iridium wire, and under high pressure, isstronger in all ^^•ays than a foil filling of like sizeand form. The interior dimensions of a cavitymay, so far as the strength of the filling itselfis concerned, be smaller for an inlay than forfoil. Certain interior dimensions and form ofcavity that are not necessary for the insertionof an iiday are necessary for the insertion offoil. 425 To withstand masticatory str
. The science and practice of dental surgery. tion, and form necessary for resistingstress (3). Gold alloyed with five per cent of platinumor coin silver, or reinforced with platino-iridium wire, and under high pressure, isstronger in all ^^•ays than a foil filling of like sizeand form. The interior dimensions of a cavitymay, so far as the strength of the filling itselfis concerned, be smaller for an inlay than forfoil. Certain interior dimensions and form ofcavity that are not necessary for the insertionof an iiday are necessary for the insertion offoil. 425 To withstand masticatory stress approximo-occlusal foil fillings require as a foundation abroad flat gingival ^^?all at right angles ^\ith thetooths axis, and need a dovetailed step, orocclusal portion, as a brace. An inlay, on theother hand, being a single rigid piece, is supportedby the whole area covered by it; its hook-likehold in the occlusal portion of the cavity ismuch stronger than that of a foil filling, so thatunless much dentine is lost by caries, little. Fig. 492. gingival wall is needed to supjaort the inlayagainst occlusal stress. \Vlien the dentineunderlying a marginal ridge is not destroyed bycaries, it is obvious that broad or deep cutting
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
