Document Detail

Change in surface hardness of BisGMA/TEGDMA polymer due to enzymatic action.
MedLine Citation:
PMID:  1401451     Owner:  NLM     Status:  MEDLINE    
The surface microhardness of specimens made of a BisGMA/TEGDMA polymer was measured before and during treatment for 60 days with phosphate buffer or phosphate-buffered esterase solution with an activity corresponding to the mean hydrolase activity of human saliva. The hardness of the buffer-treated specimens was unchanged during the incubation period, while that of the esterase-treated specimens decreased gradually. After about five days of treatment, no further change in hardness was observed for up to 60 days. Based on the difference in the calculated hardness of the specimens as a function of the applied load during measurement, it was estimated that the mean microhardness of the outermost surface layer of the esterase-treated specimens was diminished by about 15%, compared with that of the buffer-treated specimens. From these results, it was concluded that the wear resistance of a BisGMA/TEGDMA polymer is most likely diminished by hydrolases in saliva.
I B Larsen; M Freund; E C Munksgaard
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dental research     Volume:  71     ISSN:  0022-0345     ISO Abbreviation:  J. Dent. Res.     Publication Date:  1992 Nov 
Date Detail:
Created Date:  1992-11-25     Completed Date:  1992-11-25     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0354343     Medline TA:  J Dent Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1851-3     Citation Subset:  D; IM    
Department of Dental Materials, School of Dentistry, Faculty of Health Sciences, University of Copenhagen, Denmark.
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MeSH Terms
Analysis of Variance
Bisphenol A-Glycidyl Methacrylate / chemistry*
Esterases / chemistry
Hardness Tests
Materials Testing
Polyethylene Glycols / chemistry*
Polymethacrylic Acids / chemistry*
Reg. No./Substance:
0/Polyethylene Glycols; 0/Polymethacrylic Acids; 109-16-0/triethylene glycol dimethacrylate; 1565-94-2/Bisphenol A-Glycidyl Methacrylate; EC 3.1.-/Esterases

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