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. 1975 Sep-Oct;54(5):921-5.
doi: 10.1177/00220345750540052901.

Composition and mechanical properties of gutta-percha endodontic points

C M Friedman, J L Sandrik, M A Heuer, G W Rapp

Composition and mechanical properties of gutta-percha endodontic points

C M Friedman et al. J Dent Res. 1975 Sep-Oct.

Abstract

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.

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