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J Dent Res 54(5): 921-925, 1975
© 1975 International and American Associations for Dental Research
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Composition and Mechanical Properties of Gutta-Percha Endodontic Points

CHARLES M. FRIEDMAN 1, JAMES L. SANDRIK 1, MICHAEL A. HEUER 1, and GUSTAV W. RAPP 1

1 School of Dentistry, Loyola University, Maywood, Illinois 60153, USA

Gutta-percha endodontic filling points were found to contain approximately 20% gutta-percha (matrix), 66% zinc oxide (filler), 11% heavy metal sulfates (radiopacifier), and 3% waxes and/or resins (plasticizer). The mechanical properties were indicative of a partially crystalline viscoelastic polymeric material. They were found to obey Hooke's law and displayed a prominent upper and lower yield point when stressed beyond the proportional limit. The essential differences in mechanical properties of individual brands were found to be a function of the gutta-percha and zinc oxide concentration.

Submitted on November 18, 1974
Accepted on April 15, 1975






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