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Enzymatic degradation of BISGMA/TEGDMA‐polymers causing decreased microhardness and greater wear in vitro
Author(s) -
FREUND METTE,
MUNKSGAARD ERIK CHRISTIAN
Publication year - 1990
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.1600-0722.1990.tb00984.x
Subject(s) - polymer , abrasion (mechanical) , chemistry , abrasive , slurry , hydrolysis , softening , aqueous solution , indentation hardness , degradation (telecommunications) , composite material , materials science , biochemistry , organic chemistry , telecommunications , microstructure , computer science
– The microhardness of the surfaces of BISGMA/TEGDMA‐polymers decreased after treatment with pork liver esterase for 48 h in concentrations 0.05 U/ml. This softening effect on BISGMA/TEGDMA‐polymer surfaces was also shown as an increased wear rate of the polymers in the presence of esterase measured by a laboratory abrasion method. In this method, polymer cylinders were vigorously shaken in an aqueous slurry containing abrasive particles. The shaking was performed for 3 s followed by a rest period of either 100 or 200 s. This was repeated for 24 h. A greater mean loss of weight of the cylinders was measured when esterase was present in the slurry and the loss of weight increased significantly from 6.7% to 23.8% (P<0.001) when the rest period was increased from 100 s to 200 s. The results indicate that enzymatic hydrolytic activity in the mouth will contribute to a breakdown of composite resin fillings.