Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . aked limiounces f commercial alcohol. HYPERSENSITIVE DENTIN 95 at all exact, and they are therefore liable to produce more or lesspain in the act of dehydration. A better plan is to employ asyringe in which a coil of fine platinum wire is contained withinthe orifice; this coil is connected by wires through the body ofthe syringe with a source of electric current; in operation theresistance encountered by the current of electricity passing throughthe platinum coil heats it and maintain
Diseases of the soft structures of the teeth and their treatment; a text-book for students and practitioners . aked limiounces f commercial alcohol. HYPERSENSITIVE DENTIN 95 at all exact, and they are therefore liable to produce more or lesspain in the act of dehydration. A better plan is to employ asyringe in which a coil of fine platinum wire is contained withinthe orifice; this coil is connected by wires through the body ofthe syringe with a source of electric current; in operation theresistance encountered by the current of electricity passing throughthe platinum coil heats it and maintains a steady forced over this coil and through the nozzle, especially airsupplied from a receiver and under pressure that can be controlled,may be heated to a temperature that will approximate very closelythat of the tooth, and therefore produce little or no pain. Ifthe air passing from the nozzle of the syringe should be too warmit can be modified by holding it a little farther away from thetooth, or if not warm enough, more heat will be delivered whenit is held in closer Fig. 56.—Electric warm-air syringe. (Guilford.) An instrument of this character with a compressible blub insteadof an air supply from a receiver is represented in Fig. 56. Theoperation of desiccation should not be hurried; time must beallowed for raising the air to a suitable temperature, so as to causeas little pain as possible. In addition, the operation should becontinued until the dentinal walls of the cavity have becomeperceptibly lighter in color, indicating that they have been robbedof their moisture. If desiccation is not carried to this point it willfail in its effectiveness; but, if the moisture has been removed fromthe dentin to a considerable depth, as it may be if desiccation besufficiently continued, sensitiveness will have become nearly orentirely obliterated. Whether we depend entirely upon drynessto relieve hypersensation of dentin or not, it should always beresort
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