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Laboratory evaluation of the reversible/irreversible hydrocolloid impression technique
Author(s) -
Thomasz F. G. V.,
Chong M. P.,
Tyas M. J.
Publication year - 1988
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/j.1834-7819.1988.tb05856.x
Subject(s) - impression , agar , ultimate tensile strength , bond strength , materials science , tension (geology) , composite material , dentistry , medicine , computer science , biology , adhesive , genetics , layer (electronics) , world wide web , bacteria
The bond strength of reversible hydrocolloid (agar) to irreversible hydrocolloid (alginate), using three agars and eight alginates, was measured in tension. The dimensional stability of three agars with three alginates was measured using a standard dimensional stability die. Tensile bond strength values ranged from 0 kPa to 16.6 kPa, with one agar having consistently the lowest bond strength to all alginates. The dimensional change of the combination impression was up to 1 per cent, and was within acceptable limits under the conditions of the experiment. Selective use of agar and alginate is required to produce a clinically useful impression, and recommendations are given on such selection.