Effect of TEGDMA/BisGMA Ratio on Stress Development and Viscoelastic Properties of Experimental Two-paste Composites

Abstract

In this study, we explored the reduction of shrinkage stresses in restored teeth by stimulating viscous flow of adhesive restoratives during curing, by increasing the TEGDMA/BisGMA ratio in the resin of composite restoratives. We studied a series of experimental two-paste composites with different amounts of TEGDMA (30, 50, 70 wt%, respectively) in the resin by mechanical testing, infrared spectroscopy, and dilatometry, to determine how comonomer composition affects the mechanical and chemical properties of the composite during curing. It was found that the polymerization rate of BisGMA-TEGDMA composites is indicative of the viscoelastic behavior during curing: The higher the reactivity, the higher the stiffness and viscosity development. Composites with 50 wt% TEGDMA in the resin displayed the highest maximum polymerization rate. High amounts of TEGDMA in the resin only modestly increased the pre-gel viscous flow (= lowered viscosity) property of composites. Of these composites, high post-gel shrinkage is the decisive factor in high shrinkage stress development.

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References

Barron DJ, Rueggeberg FA, Schuster GS -1992-. A comparison of monomer conversion and inorganic filler content in visible light-cured denture resins. Dent Mater8:274–277.

Challa G -1993-. Polymer chemistry—an introduction. New York: Ellis Horwood Limited.

Cowperthwaite GF, Foy JJ, Malloy MA -1981-. The nature of the crosslinking matrix found in dental composite filling materials and sealants. In: Biomedical and dental applications of polymers. Koblitz FF, editor. New York: Plenum Press, pp. 379-385.

Dauvillier BS, Feilzer AJ, De Gee AJ, Davidson CL -2000-. Visco-elastic parameters of dental restorative materials during setting. J Dent Res79:818–823.

Dauvillier BS, Hübsch PF, Aarnts MP, Feilzer AJ -2001-. Modeling of viscoelastic behavior of dental chemically activated resin composites during curing. J Biomed Mater Res58:16–26.

Davidson CL, de Gee AJ -1984-. Relaxation of polymerization contraction stresses by flow in dental composites. J Dent Res63:146–148.

De Gee AJ, Davidson CL, Smith A -1981-. A modified dilatometer for continuous recording of volumetric polymerization shrinkage of composite restorative materials. J Dent9:36–42.

Feilzer AJ, De Gee AJ, Davidson CL -1989-. Increased wall-to-wall curing contraction in thin bonded resin layers. J Dent Res68:48–50.

Ferracane JL -1994-. Elution of leachable components from composites. J Oral Rehabil21:441–452.

10.

Ferracane JL, Greener EH -1986-. The effect of resin formulation on the degree of conversion and mechanical properties of dental restorative resins. J Biomed Mater Res20:121–131.

11.

Geurtsen W -1998-. Substances released from dental resin composites and glass ionomer cements. Eur J Oral Sci106:687–695.

12.

Hübsch PF -1995-. A numerical and analytical investigation into some mechanical aspects of adhesive dentistry -dissertation-. Swansea: University of Wales.

13.

Kalachandra S, Kusy RP -1991-. Comparison of water sorption by methacrylate and dimethacrylate monomers and their corresponding polymers. Polymer32:2428–2434.

14.

Kalachandra S, Taylor DF, DePorter CD, Grubbs HJ, McGrath JE -1993-. Polymeric materials for composite matrixes in biological environments. Polymer34:778–782.

15.

Lakes RS -1999-. Viscoelastic solids. New York: CRC Press.

16.

Lovell LG, Newman SM, Bowman CN -1999-. The effects of light intensity, temperature, and comonomer composition on the polymerization behavior of dimethacrylate dental resins. J Dent Res78:1469–1476.

17.

Moore JE -1976-. Photopolymerization of multifunctional acrylates and methacrylates. Am Chem Soc, Coatings and Plastics Preprints36:747–753.

18.

Peutzfeldt A -1997-. Resin composites in dentistry: the monomer systems. Eur J Oral Sci105:97–116.

19.

Rabek JF -1993-. Experimental and analytical methods for the investigation of radiation curing. In: Radiation curing in polymer science and technology. Rabek JF, editor. London: Elsevier Science Publishers Ltd.

20.

Rueggeberg FA, Hashinger DT, Fairhurst CW -1990-. Calibration of FTIR conversion analysis of contemporary dental resin composites. Dent Mater6:241–249.

21.

Venhoven BA, de Gee AJ, Davidson CL -1993-. Polymerization contraction and conversion of light-curing BisGMA-based methacrylate resins. Biomaterials14:871–875.