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CC BY-NC-ND 4.0 · Eur J Dent 2021; 15(01): 096-100
DOI: 10.1055/s-0040-1716985
Original Article

Physical and Mechanical Properties of Resins Blends Containing a Monomethacrylate with Low-polymerization Shrinkage

Aurealice Rosa Maria Martins
1   Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
,
Luciana Machado-Santos
2   Department of Prosthodontics, School of Dentistry, University of Taubaté, Taubaté, SP, Brazil
,
Regis Cleo Fernandes Grassia Jr
3   School of Dentistry, Santo Amaro University, São Paulo, SP, Brazil
,
Rafael Pino Vitti
2   Department of Prosthodontics, School of Dentistry, University of Taubaté, Taubaté, SP, Brazil
4   School of Dentistry, Herminio Ometto University Center, Araras, SP, Brazil
,
Mário Alexandre Coelho Sinhoreti
1   Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
,
William Cunha Brandt
3   School of Dentistry, Santo Amaro University, São Paulo, SP, Brazil
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Abstract

Objectives The aim of this study was to evaluate the Knoop hardness (KH), cross-link density (CLD), water sorption (WS), water solubility (WSB), and volumetric shrinkage (VS) of experimental resins blends containing a monomethacrylate with low-polymerization shrinkage.

Materials and Methods A blend of bisphenol glycidyl methacrylate (BisGMA) as base monomer was formulated with (Bis-GMA)/triethyleneglycol dimethacrylate (TEGDMA), Bis-GMA/isobornyl methacrylate (IBOMA), or Bis-GMA/TEGDMA/IBOMA in different concentrations (40, 50, or 60 wt%). The camphorquinone (CQ)/2-(dimethylamino) ethyl methacrylate (DMAEMA) was used as the photoinitiator system. The KH and CLD were measured at the top surface using an indenter. For WS and WSB, the volume of the samples was calculated in mm3. The samples were transferred to desiccators until a constant mass was obtained (m1) and were subsequently immersed in distilled water until no alteration in mass was detected (m2). The samples were reconditioned to constant mass in desiccators (m3). WS and WSB were determined using the equations m2 − m3/V and m1 − m3/V, respectively. VS results were calculated with the density parameters before and after curing.

Statistical Analysis Data were submitted to ANOVA and Tukey’s test (α = 0.05).

Results The resins containing IBOMA showed lower VS results. TEGDMA 40% and TEGDMA/IBOMA 20/20 wt% showed higher KH values. The IBOMA groups showed lower CLD, while TEGDMA groups had higher values of CLD. The BisGMA/TEGDMA resin presented the highest values of WS, and for WSB, all groups showed no significant differences among themselves.

Conclusion The monomethacrylate with low-polymerization shrinkage IBOMA used alone or in combination with TEGDMA may decrease VS, WS, and CLD values.

Keywords

methacrylate monomers - dental resin - curing performance


Publication History

Article published online:
07 January 2021

© 2021. European Journal of Dentistry. This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial-License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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