Effect of preheating on mechanical properties of a resin-based composite containing elastomeric urethane monomer

Batista, João Marcos Nascimento; Sinhoreti, Mário Alexandre Coelho; Fraga, May Anny Alves; Silva, Marcus Vinícius Manoel da; Correr, Américo Bortolazzo; Roulet, Jean‐François; Geraldeli, Saulo

doi:10.1016/j.jmbbm.2023.105758

Cited by 3 publications

(2 citation statements)

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“…This finding may be associated with the high molecular weight of Exothane-24 (682.85 g/mol), and the slightly lower DC obtained for the composites containing Exothane-24, conditions that might reduce the volumetric contraction and, consequently, the gap width. The viscosity of Exothane-24 (6 Pa·s) is known to lie between those of Bis-GMA (1200 Pa·s) and TEGDMA (0.01 Pa·s) and can also contribute to these results 8 . Thus, the second null hypothesis - Exothane-24 would not affect the GW - was rejected.…”

Section: Discussionmentioning

confidence: 99%

“…Rocha et al 6 performed a chemical analysis of Exothane- 24 for the first time and revealed that it is an elastomeric urethane tetramethyl methacrylate monomer, having a chemical structure based on cyclic aliphatic chains with urethane bonding structures in the center of the molecule and elastomeric polyether bonds close to the methacrylate functional groups with four sites for vinyl polymerization. Exothane-24 has physical properties - great elongation (5%) and elastic modulus (980 N/mm 2 ) - which might also favor the mobility and relaxation capacity of the polymer network during formation 8 .…”

Section: Introductionmentioning

confidence: 99%

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Effect of elastomeric urethane monomer on physicochemical properties and shrinkage stress of resin composites

Sinhoreti,

Tomaselli,

Rocha

et al. 2023

Braz. Dent. J.

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This study aimed to evaluate the effect of an elastomeric urethane monomer (Exothane-24) in different concentrations on physicochemical properties, gap formation, and polymerization shrinkage stress of experimental resin composites. All experimental composites were prepared with 50 wt.% of Bis-GMA and 50 wt.% of TEGDMA, to which 0 wt.% (control), 10 wt.%, 20 wt.%, 30 wt.%, and 40 wt.% of Exothane-24 were added. Filler particles (65 wt.%) were then added to these resin matrixes. Ultimate tensile strength (UTS: n = 10), flexural strength (FS: n = 10), flexural modulus (FM: n = 10), hardness (H: n = 10), hardness reduction (HR: n = 10), degree of conversion (DC: n = 5), gap width (GW: n = 10), and polymerization shrinkage stress in Class I (SS-I: n = 10) and Class II (SS-II: n = 10) simulated configuration. All test data were analyzed using one-way ANOVA and Tukey’s test (α = 0.05; = 0.2). Exothane-24 in all concentrations decreased the H, HR, DC, GW, SS-I, and SS-II (p < 0.05) without affecting the UTS, and FS (p > 0.05). Reduction in FM was observed only in the Exothane 40% and 30% groups compared to the control (p < 0.05). Exothane-24 at concentrations 20% and 30% seems suitable since it reduced GW and polymerization SS without affecting the properties of the composite resins tested, except for H.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%