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Quintessence Publishing: Journals: JAD

 

The Journal of Adhesive Dentistry

Edited by Jean-François Roulet

ISSN (print) 1461-5185 • ISSN (online) 1757-9988

Publication:

March/April 2011
Volume 13 , Issue 2



Pages: 125 - 129
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Influence of 2-Hydroxyethyl Methacrylate Concentration on Polymer Network of Adhesive Resin

Collares, Fabrício Mezzomo / Ogliari, Fabrício Aulo / Zanchi, César Henrique / Petzhold, Cesar Liberato / Piva, Evandro / Samuel, Susana Maria Werner

Purpose: To evaluate the effect of variations in 2-hydroxyethyl methacrylate (HEMA) concentrations in an experimental comonomer blend on degree of conversion, water sorption, solubility, and ultimate tensile strength of adhesive resin. Materials and Methods: The effect of HEMA content (0, 15, 30, and 50%wt – control, G15, G30, and G50 groups, respectively) was tested in an experimental comonomer blend of bis-GMA, bis-EMA, TEG-DMA, and HEMA. The degree of conversion, polymerization rate, ultimate tensile strength, water sorption, and solubility of the adhesive resin blends were determined. Results: At 40 s of light activation time, groups G30 and G50 showed a decrease of 30% and 61%, respectively, in degree of conversion compared to control. Water sorption and solubility differed for all groups, and was statistically higher in G50. For ultimate tensile strength, the control and G15 groups showed statistically higher values than the other groups (p < 0.05). Conclusion: Higher HEMA content increases dental adhesive resin degradation.

Keywords: adhesive systems, HEMA, real-time infrared, polymerization kinetics, water sorption, solubility

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