PMID- 21594225 OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - J Adhes Dent JT - The Journal of Adhesive Dentistry IS - 1757-9988 (Electronic) IP - 2 VI - 13 PST - ppublish DP - 2011 PG - 125-129 LA - en TI - Influence of 2-Hydroxyethyl Methacrylate Concentration on Polymer Network of Adhesive Resin LID - 10.3290/j.jad.a18781 [doi] FAU - Collares, Fabrício Mezzomo AU - Collares F FAU - Ogliari, Fabrício Aulo AU - Ogliari F FAU - Zanchi, César Henrique AU - Zanchi C FAU - Petzhold, Cesar Liberato AU - Petzhold C FAU - Piva, Evandro AU - Piva E FAU - Samuel, Susana Maria Werner AU - Samuel S CN - OT - adhesive systems OT - HEMA OT - real-time infrared OT - polymerization kinetics OT - water sorption OT - solubility AB - 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. AID - 842891