Water Sorption of Resin-based Materials

Objectives: The aim of this study is to obtain information of the degree of water these materials absorb and how this may affect the dimensions of a cement, as well the cement's ultimate tensile strength.

Methods: Cylinders (4mm diameter and 6mm long) of resin-based (PermaFlo DC(Ultradent), PANAVIA F(Kuraray), RelyX ARC(3M), LINKMAX(GC)), resin-modified glass ionomer cement(FujiCEM(GC)), and compomer (PermaCem(DMG)) luting agents were constructed. The light-cured and dual-cured materials were light cured for 60s at each end of the mould used to make the cylinders. The specimens were placed in either distilled water, or a solution of 50 Vol% ethanol and water and stored at 37^oC. Measurements were made approximately after one hour, and at 1 hour, days 1, 2, 3 and 7 then weekly until the variations in dimension and water sorption stabilised. The tensile strengths of specimens were made at days 1, 3, 7, 14 then 1, 3 and 6 months after manufacture.

Results: The data were analyzed by one-way ANOVA and Fisher's PLSD test (p<0.05). Resin-based cements tended to show lower water sorption than of resin-modified GIC or compomer. Resin-based cements stored in the solution of 50 Vol% ethanol and water showed lower tensile strength at earlier stage than the ones stored in distilled water. Compomer resulted in stable, lower tensile strength.

Conclusion: Resin-based luting agents showed higher stability than resin-modified GIC or compomer luting agents.

*3257 Water Sorption of Resin-based Materials*
A. KOIWA, Tokyo Medical & Dental University, COE Program, FRMDRTB at TMDU, Japan, M. BURROW, University of Melbourne, Melbourne Victoria, Australia, and J. TAGAMI, COE Program, FRMDRTB at TMDU, Tokyo Medical and Dental University, Tokyo, Japan Objectives: The aim of this study is to obtain information of the degree of water these materials absorb and how this may affect the dimensions of a cement, as well the cement's ultimate tensile strength. Methods: Cylinders (4mm diameter and 6mm long) of resin-based (PermaFlo DC(Ultradent), PANAVIA F(Kuraray), RelyX ARC(3M), LINKMAX(GC)), resin-modified glass ionomer cement(FujiCEM(GC)), and compomer (PermaCem(DMG)) luting agents were constructed. The light-cured and dual-cured materials were light cured for 60s at each end of the mould used to make the cylinders. The specimens were placed in either distilled water, or a solution of 50 Vol% ethanol and water and stored at 37^oC. Measurements were made approximately after one hour, and at 1 hour, days 1, 2, 3 and 7 then weekly until the variations in dimension and water sorption stabilised. The tensile strengths of specimens were made at days 1, 3, 7, 14 then 1, 3 and 6 months after manufacture. Results: The data were analyzed by one-way ANOVA and Fisher's PLSD test (p<0.05). Resin-based cements tended to show lower water sorption than of resin-modified GIC or compomer. Resin-based cements stored in the solution of 50 Vol% ethanol and water showed lower tensile strength at earlier stage than the ones stored in distilled water. Compomer resulted in stable, lower tensile strength. Conclusion: Resin-based luting agents showed higher stability than resin-modified GIC or compomer luting agents.
Seq #344 - Prosthodontic Polymers 10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2
Back to the Dental Materials: VI - Polymer Materials-Mechanical Properties and Degradation Program Back to the IADR/AADR/CADR 82nd General Session (March 10-13, 2004)
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