The Dental cosmos . th numbered 1(bicuspid), 2 (canine), 3 (molar), 4 (ca-nine), treated with 5 per cent, oxalic acidfor 32 hours, brushed quarter-hourly for tenseconds with 10 per cent, pumice, then for47£ hours brushed quarter-hourly for twenty-five seconds, and for 7 hours brushed quarter-hourly for forty-five seconds. Comparativelyshallow extensive cavities were produced, in-volving in Xos. 1 and 3 nearly the whole ofthe buccal surface. The surface of the cav-ities is traversed by numerous ridges. Mar-gins are not very sharp; there is a distinctwearing down of the remaining enamel: the sur
The Dental cosmos . th numbered 1(bicuspid), 2 (canine), 3 (molar), 4 (ca-nine), treated with 5 per cent, oxalic acidfor 32 hours, brushed quarter-hourly for tenseconds with 10 per cent, pumice, then for47£ hours brushed quarter-hourly for twenty-five seconds, and for 7 hours brushed quarter-hourly for forty-five seconds. Comparativelyshallow extensive cavities were produced, in-volving in Xos. 1 and 3 nearly the whole ofthe buccal surface. The surface of the cav-ities is traversed by numerous ridges. Mar-gins are not very sharp; there is a distinctwearing down of the remaining enamel: the surface is fairly polished, but under the mag-nifier presents a pitted appearance, with stria?faint or invisible. Experiment 17. Six teeth—central, lateral,canine, bicuspid, first and second molars—placed in a curve to reproduce the naturalarch, were bathed with 5 per cent, phos-phoric acid for 13 hours, brushed hourly fortwo minutes with 50 per cent, pumice; thenfor 11 hours brushed hourly three minutes. Fig. Beautiful case of wasting (chemico-abra-sion) produced by the action of phosphoricacid in conjunction with friction appliedhorizontally; 3. gold: 4, gutta-percha filling. and for 73 hours four minutes hourly. InXo. 1 is seen a beautiful case of wasting, be-ginning at the neck and extending alony thedisto-labial margin to the cutting edge (). and then spreading laterally. Xo. 3was filled with gold. Xo. 4 with gutta-perchaat the neck. Both of the fillings stand higherthan the surrounding dentin. The enamelof all the teeth is very thin; the polish fair,that of the dentin high. The cavities at theneck are not so deep as would be produced inthe same time without the action of are distinctly visible under glass. Du-ration of experiment 97 hours: total amountof brushing G hours. Experiment 18. The teeth of the right halfof a mandible were treated separately fromthe third molar forward with 5 per cent, so-lutions of hydrochloric, phosphoric, oxalic,lactic
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