The Dental cosmos . general malcondi-tion. He claims that he brushes his teethten minutes at a time twice daily, anduses a French preparation containing a fair amount of grit. Making all due al-lowance for exaggeration we may safelyestimate the total amount of time spentdaily as at least four minutes, which isquite sufficient. That which stamps thecase as undoubted wasting is the pro-nounced wearing of the gold fillings. Thefilling in a is very much rounded off andon a lower level than the enamel. In eand f both fillings are worn down untilthey are as thin as paper, and in f partic-ularly the
The Dental cosmos . general malcondi-tion. He claims that he brushes his teethten minutes at a time twice daily, anduses a French preparation containing a fair amount of grit. Making all due al-lowance for exaggeration we may safelyestimate the total amount of time spentdaily as at least four minutes, which isquite sufficient. That which stamps thecase as undoubted wasting is the pro-nounced wearing of the gold fillings. Thefilling in a is very much rounded off andon a lower level than the enamel. In eand f both fillings are worn down untilthey are as thin as paper, and in f partic-ularly the gold is worn quite through atone point near the center of the rilling,exposing the dentin on the floor of thecavity. A very similar condition can beproduced artificially, as in the case shownin Fig. 20 (page 112). where the teeth 22o 226 THE DENTAL COSMOS. were very much shortened by brushing foreighteen hours with a well-known Eng-lish tooth-paste. In another experimentthe teeth of both the upper and lower Fig. Shortening of the teeth and open bite pro-duced by immoderate use of brush and pow-der. jaws were brushed at the same time, imi-tating as nearly as possible the mannerof brushing practiced in the case shownin Fig. 31, fillings of porcelain, phosphatecement, silicate cement and gold havingbeen inserted. Brushing for thirty-fivehours with pumice not only producedwedge-shaped defects in all of the teethto the first molars, but shortened all ofthe incisors so as to produce a distinctlyopen bite, and at the same time removedthe greater part of the enamel from thelabial surfaces. The porcelain fillingwithstood the wear much better than theenamel, the cements less well. Experiments relating to the action ofcarbonic acid upon the teeth were re-ported upon in the February issue of thisjournal. In continuation of the same Ifound that when carbonic acid was madeto bubble through a shallow layer ofwater from a glass tube drawn out to afine point, and to impinge upon the sur-fa
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