Cover of: Effect of salivary esterase on integrity and fracture toughness of resin-dentin interface. by Babak Shokati
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February 25, 2012 | History

Effect of salivary esterase on integrity and fracture toughness of resin-dentin interface.

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Written in English

183 pages

"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.

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Edition Description

"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.

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.

The Physical Object

Pagination
183 leaves.
Number of pages
183

ID Numbers

Open Library
OL21219142M
ISBN 13
9780494274576
OCLC/WorldCat
458722477

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History

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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.