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"Human Salivary Derived Esterase" (HSDE) degrades dental composite resin restorative materials.Results and conclusions. Significantly higher amounts of methacrylic acid (MAA) and Bisphenol-A-bis [2, 3-dihydroxypropyl]-ether (Bis-HPPP) were produced in HSDE than in PBS. 180-day HSDE incubated specimens had a lower fracture toughness (KIci) than the non-incubated group (P<0.05). KIci values of PBS incubated groups were not significantly different from that of the non-incubated group. There was a significant negative correlation between the KIci values and Bis-HPPP production.Hypothesis. HSDE degrades the resin-dentin interface to produce biodegradation by-products in amounts which are negatively correlated with a reduction in the interfacial fracture toughness of the resin-dentin bond.Methods. Mini short-rod specimens (n=10/group), fabricated using composite (Z250) and adhesive system (Scotchbond Multi Purposes), were either not incubated; or incubated in Phosphate-Buffered Saline (PBS) or HSDE media. Degradation products were isolated and specimens were fracture toughness tested following 30, 90 or 180-day incubation periods.
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Effect of salivary esterase on integrity and fracture toughness of resin-dentin interface.
2007
in English
0494274573 9780494274576
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Book Details
Edition Notes
Source: Masters Abstracts International, Volume: 45-06, page: 3116.
Thesis (M.Sc.)--University of Toronto, 2007.
Electronic version licensed for access by U. of T. users.
ROBARTS MICROTEXT copy on microfiche.
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- Created November 1, 2008
- 4 revisions
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February 25, 2012 | Edited by 142.150.117.144 | Added new cover |
April 28, 2011 | Edited by OCLC Bot | Added OCLC numbers. |
December 15, 2009 | Edited by WorkBot | link works |
November 1, 2008 | Created by ImportBot | Imported from University of Toronto MARC record |