Principles and practice of operative dentistry . d bistoury, eight to ten millimetres in length, butnot going deeper than the capillary layer of the cutis. Almost immedi-ately there is produced an anaemic zone around the incision which enlargesoutwardly. If the spray is again made to play for a few seconds over thesurface which has become anaemic, the region becomes perfectly bloodlessand completely anaesthetic. The advantage of this method is that thetissues become anaesthetic much sooner than by the Eichardson method,and there is not the danger of so reducing the temperature as to freeze the
Principles and practice of operative dentistry . d bistoury, eight to ten millimetres in length, butnot going deeper than the capillary layer of the cutis. Almost immedi-ately there is produced an anaemic zone around the incision which enlargesoutwardly. If the spray is again made to play for a few seconds over thesurface which has become anaemic, the region becomes perfectly bloodlessand completely anaesthetic. The advantage of this method is that thetissues become anaesthetic much sooner than by the Eichardson method,and there is not the danger of so reducing the temperature as to freeze thepart and thus cause death of the tissue and sloughing. Dr. Letamendi offers the following theory to account for the effect ofthe slight incision made in the superficial structures of the skin.* Theabstraction of heat caused by the application of the ether spray causesrelaxation and consequently dilatation of the vessels. The incision pro-duces a sudden reaction, or stimulus, which converts the extreme dilatation * Archives de Physiologie, ANESTHETICS, LOCAL, AND GENERAL. 655 into an extreme contraction, which makes the anaemia and consequentlythe anaesthesia complete. Arnott suggested as a substitute for ether and rhigolene a freezing mix-ture composed of ice or snow and common table salt in the proportion oftwo parts of ice or snow to one of salt. To be most effective it should beenclosed in a bag, one side of which should be made of rubber sheetingand the other of a coarse meshed linen or cotton cloth, to permit the waterformed by the melting of the ice to drain away. In applying the bag to produce anaesthesia of the gums preparatory toextracting a tooth, the cloth side should be placed in contact with thegums and tooth, the rubber side being against the cheek, thus protectingit from injury which might result from a reduction of the briny fluid which accumulates in the mouth from the melting of theice may be removed by the use of the saliva ejector. The
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
