Effect of salivary esterase on integrity and fracture toughness of resin-dentin interface.
Published: 2007
Language: eng
Number of pages: 183
ISBN-13: 9780494274576
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&lt;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.
Notes: Source: Masters Abstracts International, Volume: 45-06, page: 3116.

Thesis (M.Sc.)--University of Toronto, 2007.

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