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Ageing effects on mechanical properties of gutta‐percha (trans‐polyisoprene)
Author(s) -
Arvanitoyannis Ioannis,
Blanshard John M. V.,
Kolokuris Ioanniis
Publication year - 1992
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990280307
Subject(s) - materials science , gutta percha , ageing , wax , composite material , brittleness , toughening , dentistry , root canal , toughness , medicine , genetics , biology
This study examined both the effect of chemical composition and of storage (ageing), for periods up to 28 weeks, and at temperatures from ‐ 15 to 50°C on the mechanical properties. The presence of high contents of barium sulphate, zinc oxide and colouring agent in commercial dental gutta‐percha has the same effect on the mechanical properties of gutta‐percha as prolonged storage time, i.e. increase in brittleness. On the contrary, the presence of Thermoplast or Wax (75%) has an accentuated plasticising effect on gutta‐percha improving thus, to a certain extent, its clinical characteristics.