Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/22647
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Type: Journal article
Title: Bond strengths between composite resin and auto cure glass ionomer cement using the co-cure technique
Author: Knight, G.
McIntyre, J.
Mulyani
Citation: Australian Dental Journal, 2006; 51(2):175-179
Publisher: Australian Dental Assn Inc
Issue Date: 2006
ISSN: 0045-0421
1834-7819
Abstract: Background: The clinical technique for sandwich restorations prescribes etching initially set auto cure glass ionomer cement (GIC) prior to placing a layer of resin bond to develop a weak mechanical bond between composite resin and GIC. Co-curing a resin modified glass ionomer cement (RMGIC) bond and composite resin to GIC may create a chemical bond and improve the bond strengths between these two materials. Methods: A total of 48 specimens were prepared, 12 in each of four categories. Capsulated GIC was placed into a mould and allowed to set for four minutes, etched for five seconds followed by placement of a resin bond and photo cured for five seconds over which a composite resin was puddled onto the resin bond and photo cured for 10 seconds. Capsulated GIC was placed into a mould and allowed to set for four minutes after which a sample of RMGIC (Riva LC) was prepared using twice the liquid powder ratio and painted over the surface of the set GIC using a micro brush. An increment of composite resin was added over the RMGIC and both materials were photo co-cured for 10 seconds. Capsulated GIC was placed into a mould and RMGIC (Riva LC) that had been prepared using twice the liquid powder was brushed over the GIC (prior to initial set) followed by the placement of a layer of composite resin and photo co-cured for 10 seconds. Capsulated GIC was placed into a mould and RMGIC (Fuji II LC) that had been prepared using twice the liquid powder was brushed over the GIC (prior to initial set) followed by the placement of a layer of composite resin and photo co-cured for 10 seconds. Shear testing of each of the samples was carried out and specimens were examined to determine the nature of the fracture. Selected samples were prepared for SEM investigation to observe the interfaces between the GIC and composite resin. Results: There were significantly lower bond strengths (P<0.05) amongst samples that had been etched and bonded (2.42MPa) compared to the other samples that had been co-cure bonded with RMGIC (6.48–7.05MPa). There were no significantdifferences amongst the bond strengths of the samples co-cure bonded with RMGIC. Specimens prepared by the ‘etch and bond’ technique failed adhesively and co-cured specimens failed cohesively within the GIC. SEM investigation showed chemical bonds between RMGIC bond and GIC and composite resin. Conclusions: The co-cured RMGIC bonding system eliminates several placement steps and produces a significantly stronger chemical bond between GIC and composite resin than the ‘etch and bond’ technique. RMGIC bond and composite resin may be co-cured to GIC either before or after initial set has occurred.
Keywords: Bond strength
auto cure glass ionomer cement
resin modified glass ionomer cement
composite resin
cocure
Description: The document attached has been archived with permission from the Australian Dental Association. An external link to the publisher’s copy is included.
DOI: 10.1111/j.1834-7819.2006.tb00423.x
Published version: http://www.ada.org.au/App_CmsLib/Media/Lib/0610/M27910_v1_632972141250285000.pdf
Appears in Collections:Aurora harvest 2
Dentistry publications

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