Flexural properties of resin-modified "hybrid" glass-ionomers in comparison with conventional acid-base glass-ionomers.
The mechanical properties of resin-modified "hybrid" glass-ionomers, for both restorative and liner/base applications, were assessed by a flexural test and compared with those of conventional acid-base glass-ionomers. Flexural strength, flexural modulus, and the modulus of resilience were determined 30 minutes after mixing, and at 24 hours and 3 months after aging in distilled water at 37 degrees C. With a microscope and SEM observations, a comparison of marginal breakdown was made between a resin-modified and a conventional glass-ionomer restoration in bovine cavities, after cyclic loading with steel balls. It was found that resin-modified glass-ionomers were stronger, more flexible, and more resilient than conventional acid-base glass-ionomers. This was in accord with the finding that less marginal breakdown and surface deterioration occurred in a resin-modified glass-ionomer than in a conventional analogue. For some materials the flexural properties progressively improved between 24 hours and 3 months, while others showed no improvement or even deteriorated.
Momoi
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Department of Operative Dentistry, School of Dental Medicine, Tsurumi University, Yokohama, Japan.
Hirosaki
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Kohno
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McCabe
J F
JF
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D003736:Dental Cavity Lining; D019554:Dental Restoration Wear; D004548:Elasticity; D005899:Glass Ionomer Cements / Q000737:chemistry*; D008298:Maleates / Q000737:chemistry; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D018583:Pliability; D012117:Resins, Synthetic / Q000737:chemistry; D013499:Surface Properties
D003188:Composite Resins; C079765:Fuji II LC cement; D005899:Glass Ionomer Cements; D008298:Maleates; C088835:Photac-Bond; C081144:Photac-Fil; D012117:Resins, Synthetic; C074319:GC Lining Cement; C061499:Ketac-Bond; C084541:Fuji glass-ionomer lining cement; C037885:Fuji-ionomer; C040964:Ketac-Fil