. Electro-radiographic diagnosis; a book on the electric test for pulp vitality, giving the technic of its use in detail and submitting clinical evidence of its absolute necessity to dental diagnosis . ined. If the switch- PULP TESTIXG IMACHIXES 31 board lias been built witli the idea of giving tlie operatora pulp testing current, doubtless such a current is avail-able, for dentistr^^ is fortunate in having such reliablemanufacturers of electric equipment. But certainly it isrisky business to tap somewhere into a switch-board, not built especially to deliver a pulp testing orionization current
. Electro-radiographic diagnosis; a book on the electric test for pulp vitality, giving the technic of its use in detail and submitting clinical evidence of its absolute necessity to dental diagnosis . ined. If the switch- PULP TESTIXG IMACHIXES 31 board lias been built witli the idea of giving tlie operatora pulp testing current, doubtless such a current is avail-able, for dentistr^^ is fortunate in having such reliablemanufacturers of electric equipment. But certainly it isrisky business to tap somewhere into a switch-board, not built especially to deliver a pulp testing orionization current in the hoioe that the current attainedwill be of the right character. As always, when using the dental switchboard as apulp tester, one must use the right kind of dental elec-trode, or failure will result no matter how joerfect thecurrent supplied may be. The Choke Coil, Rheostat or Transformer The machine I designate as a choke coil, rheostat, ortransformer (Fig. 6) operates from a lamjD socket. Asthe name implies, the commercial current taken from thelight socket is choked back or altered by means of atransformer coil and delivered by the machine for use inthe correct strength to test Fig. 6.—Pulp tester of the type which operates from a lamp socket. The necessity of connecting this little machine to alight socket is disadvantageous and sometimes , these things are not vital to the efficiency ofthe machine as an adequate iDulp tester. 32 ELECTEO-EADIOGRAPHIC DIAGNOSIS The High-Frequency Machine (Also known as the Tesla Coil and Violet Ray Machine) The high-frequency machine (Fig. 7) is used by someas a pulj) tester. Perhaps the best wa,y to express itsstatus as a pulp tester is to say it has undeveloped possi-bilities. The fact that the high-frequency current maybe applied to metal fillings and crowns without extremepain is an advantage but the following shortcomings areserious disadvantages: (1) Ordinary insulation does notsuffice; the current pene
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdiagnos, bookyear1921
