Document Detail

Degradation and formation of bisphenol A in polycarbonate used in dentistry.
MedLine Citation:
PMID:  15137459     Owner:  NLM     Status:  MEDLINE    
To study long-term degradation of polycarbonate (PC) and the formation and the release of bisphenol A (BPA) in vivo and in vitro, PC brackets placed in the oral cavity for 18-40 months as well as bracket, denture plate, and temporary crown placed in water at 37 degrees C for 34 months were examined for the changes of BPA content and molecular weight in PC using high performance liquid chromatography and size exclusion chromatography. BPA release in vitro was also monitored. The BPA content and molecular weight for the brackets in vivo showed a tendency to increase from 38-60 microg/g to 324-697 microg/g and to decrease from 49 x 10(3) - 54 x 10(3) to 43 x 10(3) - 45 x 10(3) during 18-40 months, respectively. The content and total release of BPA in vitro after 34 months were 472 and 37.4 microg/g for bracket, 130 and 2.2 microg/g for denture plate, and 50 and 2.8 microg/g for temporary crown, respectively. BPA appeared to be released more in saliva than that expected from the in vitro data. Additives contained in the PC materials were suggested to influence the formation of BPA.
Mariko Watanabe
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of medical and dental sciences     Volume:  51     ISSN:  1342-8810     ISO Abbreviation:  J. Med. Dent. Sci.     Publication Date:  2004 Mar 
Date Detail:
Created Date:  2004-05-12     Completed Date:  2004-06-03     Revised Date:  2010-04-12    
Medline Journal Info:
Nlm Unique ID:  9717112     Medline TA:  J Med Dent Sci     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  1-6     Citation Subset:  D; IM    
Department of Applied Functional Molecules, Division of Biofunctional Molecules, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Japan.
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MeSH Terms
Chromatography, Gel
Chromatography, High Pressure Liquid
Dental Materials / chemistry*
Dental Restoration, Temporary
Denture Bases
Glass / chemistry
Materials Testing
Molecular Weight
Orthodontic Brackets
Phenols / chemistry*
Polycarboxylate Cement / chemistry*
Saliva / chemistry
Surface Properties
Time Factors
Reg. No./Substance:
0/Dental Materials; 0/Phenols; 0/Polycarboxylate Cement; 25766-59-0/polycarbonate; 80-05-7/bisphenol A

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