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Effect of an elastomeric urethane monomer on BisGMA-free resin composites containing different co-initiators

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Abstract

Objectives

The aim of this study was to investigate the mechanical, chemical, optical, and adhesive properties of BisGMA-free experimental resin composites containing Exothane-24—an elastomeric urethane monomer—and different co-initiators.

Materials and methods

A blend of urethane dimethacrylate (UDMA), extended dimethacrylate urethane (PEG 400), triethylene glycol dimethacrylate (TEGDMA), and camphorquinone was prepared. Two different co-initiators—dimethyl aminoethyl methacrylate (DMAEMA) or 4-N alcohol, N-dimethylamine phenylethyl (DMPOH)—were added to the blend. Exothane-24 monomer was added to the blend for each co-initiator and four groups were established as follows: DMAEMA; DMAEMA + Exothane; DMPOH; and DMPOH + Exothane. Specimens were photo-activated using a multi-wave LED light-curing unit (VALO; 954 mW/cm2 of irradiance). Mechanical (ultimate tensile strength, flexural strength, flexural modulus and hardness), chemical (degree of conversion, hardness reduction, water sorption and solubility), optical (color change), and adhesive (microtensile bond strength) properties were analyzed. Data were submitted to two-way ANOVA and Tukey’s test (α = 0.05).

Results

The resin composite containing DMPOH and Exothane-24 showed similar or superior performance to those of the other experimental composites for mechanical and chemical properties, except for flexural strength. It also showed less color change and greater micro-tensile bond strength.

Conclusions

Among the combinations tested, the BisGMA-free resin composite containing Exothane-24 combined with the DMPOH co-initiator showed the best mechanical, chemical, optical, and adhesive properties.

Clinical relevance

Exothane-24 monomer and DMPOH co-initiator could be useful in the formulation of BisGMA-free resin composites in order to minimize exposure to BPA.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil

    Robson Ferraz de Oliveira

  2. Division of Biomedical Materials, School of Dental Medicine, East Carolina University, Greenville, NC, USA

    Gabriel Flores Abuna & Saulo Geraldeli

  3. Restorative Dental Science Department, Operative Dentistry Division, College of Dentistry, University of Florida, Gainesville, FL, USA

    Jean-François Roulet

  4. Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, University of Campinas, Vila Rezende, Limeira Avenue, Areiao, Piracicaba, São Paulo, 90113414-903, Brazil

    Mário Alexandre Coelho Sinhoreti

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  1. Robson Ferraz de Oliveira
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  2. Gabriel Flores Abuna
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Correspondence to Mário Alexandre Coelho Sinhoreti.

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This manuscript does not contain any studies with human participants or animals performed by any of the authors. All procedures performed involving human wastes were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Approval was obtained from the ethics committee of Piracicaba Dental School, University of Campinas, Brazil (#55806016.6.5418). The procedures used in this study adhere to the tenets of the Declaration of Helsinki.

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de Oliveira, R.F., Abuna, G.F., Roulet, JF. et al. Effect of an elastomeric urethane monomer on BisGMA-free resin composites containing different co-initiators. Clin Oral Invest 26, 957–967 (2022). https://doi.org/10.1007/s00784-021-04078-1

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