. Local and regional anesthesia : with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and on other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. of 1 : 2000 it prevents the developments ofbacteria, and in more concentrated solution, 1 : 200 it is destructiveto most organisms. Dentists frequently make use of this quality aswell as its anesthetic effect by applying solutions to sensitive pulpcavities; this anesthetic property is quite decided. Experiments uponanimals show that 1 : 1000 solutions will
. Local and regional anesthesia : with chapters on spinal, epidural, paravertebral, and parasacral analgesia, and on other applications of local and regional anesthesia to the surgery of the eye, ear, nose and throat, and to dental practice. of 1 : 2000 it prevents the developments ofbacteria, and in more concentrated solution, 1 : 200 it is destructiveto most organisms. Dentists frequently make use of this quality aswell as its anesthetic effect by applying solutions to sensitive pulpcavities; this anesthetic property is quite decided. Experiments uponanimals show that 1 : 1000 solutions will paralyze the cutaneous nerve-endings of frogs immersed in it for a short time. As recommendedby Fischer, the proportion in anesthetic mixtures should be about1 : 5000. He prefers the following formula, which he recommends forinfiltration purposes: THE ORGANS OF SPECIAL SENSE WITH DENTAL ANESTHESIA 599Novocain : ^ Naci ..;.;;.;;;. 0;92 Thymol 0 025 Distilled water I00 0 For all practical purposes our solution No. 2 (1 and 2 per cent,novocain), with 5 drops of adrenalin to the ounce, will be found amplysufficient, much cheaper, and more satisfactory than the many pro-prietaries now on the market, or the solution recommended by Fischer. Fig. -Injection syringe of glass and metal, designed by Dr. Guido for explanation of lettering.) (See Fig. may be used. For injection into the gums specially constructedsyringes with short, stout needles, often directed at an angle, are neces-sary, as the ordinary syringe and needle will not stand the pressureneeded to infiltrate such dense tissue. The syringe and needlesshown in Figs. 248 and 249 have, after a thorough experience, beenfound to fill all requirements, and have been adopted by Fischer. 6oo LOCAL ANESTHESIA The dental nerves and their areas of distribution are seen in , 160, 161, 162, and 163, and a more thorough description is givenin the chapter on the Head. It should be remembered that dental anesthesia,
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