The stiffness tester and torque meter were found to yield nearly the same measurements of bending deformation for orthodontic wires as small as .007 inch diameter, provided the different bending apparatus are calibrated to each other. Although frictional losses in the test apparatus did not appear to be significant, the test span length does significantly affect measured values of Young's modulus and flexural yield strength, in a manner similar to that previously found for larger-diameter wires.
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References
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New American Dental Association Specification No. 32 for Orthodontic Wires Not Containing Precious Metals, JADA95 :1169-1171,1977.
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Brantley, W.A. ; Augat, W.S.; Myers, C.L.; and Winders, R.V.: Bending Deformation Studies of Orthodontic Wires, J Dent Res (to be published).
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Craig, R.G.; McIlwain, E.D.; and Peyton, F.A.: Bending and Torsion Properties of Endodontic Instruments, Oral Surg, Oral Med and Oral Path25:239-254, 1968.
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Nie, N.H. ; Hull, C.H.; Jenkins, J.G.; Steinbrenner , K.; and Bent, D.H.: Statistical Package for the Social Sciences, Ch. 18, 2nd ed, New York: McGraw-Hill Book Co., 1975.
