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Distortion of impression materials used in the double‐mix technique
Author(s) -
PETERSEN GERT FORUM,
ASMUSSEN ERIK
Publication year - 1991
Publication title -
european journal of oral sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.802
H-Index - 93
eISSN - 1600-0722
pISSN - 0909-8836
DOI - 10.1111/j.1600-0722.1991.tb01039.x
Subject(s) - impression , viscosity , distortion (music) , materials science , swelling , composite material , diffusion , thermodynamics , computer science , physics , optoelectronics , amplifier , cmos , world wide web
— According to the so‐called double‐mix technique for impression taking, a material of high and one of low viscosity set against each other. We found that a distortion of the joined materials occurred which may compromise the precision of the impression. The distortion of such combinations of materials of high and low viscosity was measured on beam‐like specimens. Significant differences between materials were observed. The phenomenon may be explained by a swelling of the material of low viscosity. The swelling may be associated with a diffusion of unreacted compounds from the material of high viscosity into the material of low viscosity. Measurements of the swelling of specimens immersed in the catalyst component of unset material showed an increase in length of 2‐5%.