Effects of mastication on the distribution of molecular weights and on the mechanical properties of native and commercial dental gutta percha (trans‐polyisoprene) | Zendy

Arvanitoyannis Ioannis | Zendy; Blanshard John M. V. | Zendy; Kolokuris Ioannis | Zendy

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Effects of mastication on the distribution of molecular weights and on the mechanical properties of native and commercial dental gutta percha (trans‐polyisoprene)

Author(s) -

Arvanitoyannis Ioannis,

Blanshard John M. V.,

Kolokuris Ioannis

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.4990270103

Subject(s) - mastication , materials science , atmosphere (unit) , gutta percha , molecule , molecular mass , molar mass distribution , composite material , chemistry , dentistry , organic chemistry , polymer , root canal , thermodynamics , medicine , enzyme , physics

Mastication of gutta percha (trans‐polyisoprene) resulted in the selective scission of molecules, producing a narrower distribution of lower molecular weights. The mechanical properties of the samples also underwent a significant change due to mastication. The greater the content of incompatible substances (salts and oxides) in commercial gutta percha. the more substantial were these effects. The atmosphere (air, N 2 , O 2 ) in which the experiments were conducted yielded significantly different results. The decrease in molecular weight was far greater in an O 2 atmosphere than under a current of nitrogen or air, owing to the combination of double bonds with O 2 .

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