OBSERVATIONS ON ELECTRICAL PULP TESTING

¹ School of Dental and Oral Surgery, Columbia University, New York City

1. Physiological aspects of pulp vitality were studied by electrical means which disclosed: (a) that tooth impedance varied inversely with stimulating frequency, (b) that threshold of stimulation varies directly with frequency of stimulating current, (c) that frequencies between 1,000 and 5,000 cycles seemingly separate the pulpal and peridental membrane responses in some instances. 2. Thermionic tube oscillators were constructed for clinic use, the outputs of which are measured with a voltmeter and microameter. 3. Voltage and current readings were evaluated and compared. 4. A series of tests were conducted on questionable and control teeth with apparently significant statistical results.