Resistencia a la flexión y módulo elástico de resinas de alta, mediana y baja densidad

Sezín, Mario; Lutri, M. S.; Mirotti, G; Kraemer, ME; Monserrat, N; Piconi, MC; Caballero, AL; Crohare, L

doi:10.25014/revfacodont271.2018.3.14

Cited by 2 publications

(4 citation statements)

References 11 publications

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“…Several studies [4,[29][30][31][32] have assessed the flexural strength of direct-use resin composites following the guidelines of the International Organization for Standardization (ISO) 4049-2019 [23], which suggests a geometric dimension with a unit of analysis (resin bar) that does not adjust to the clinical reality; thus, this may generate some controversy in respect of results. Yap et al, concluded in their study that microflexural tests on resin composites gave higher values than flexural tests regardless of the conditioning medium, either air or artificial saliva.…”

Section: Discussionmentioning

confidence: 99%

Effect of Additional Dry Heat Curing on Microflexural Strength in Three Types of Resin Composite: An In Vitro Study

et al. 2022

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Aim: Additional dry heat curing is a method that favorably influences the mechanical properties of an indirect resin composite restoration. Microflexural strength is a property currently applied for the evaluation of indirect resin composite restorations. The aim of the present study was to assess the effect of additional dry heat curing on microflexural strength in three types of direct-use resin composites. Materials and Methods: This in vitro study consisted of 70 resin composites samples made with a 6 × 2 × 1 mm metal matrix and divided into seven experimental groups, which included Gr1a: Tetric N-Ceram without additional dry heat curing (n = 10); Gr1b: Tetric N-Ceram with additional dry heat curing (n = 10); Gr 2a: Filtek Z350 XT without additional dry heat curing (n = 10); Gr2b: Filtek Z350 XT with additional dry heat curing (n = 10); Gr3a: Filtek Z250 without additional dry heat curing (n = 10); Gr3b: Filtek Z250 with additional dry heat curing (n = 10); and Gr4: SR Nexco Paste (control) without additional dry heat curing (n = 10). The samples were stored in distilled water at 37 °C for 24 h. A universal testing machine with a 2000 N load cell at a speed of 1 mm/min was used to assess flexural strength. The data were analyzed with a parametric ANOVA test with Tukey’s post hoc intergroup factor (for groups without heat treatment) and a nonparametric Kruskall Wallis test with Bonferroni’s post hoc (for groups with heat treatment). In addition, the comparison of independent groups in each resin composite type with and without heat treatment was performed with a Mann Whitney U test. A significance level of p < 0.05 was considered. Results: The Filtek Z250 resin composite with and without additional dry heat curing presented the highest microflexural strength values with 137.27 ± 24.43 MPa and 121.32 ± 9.74 MPa, respectively, while the SR Nexco Paste (control) resin composite presented the lowest microflexural strength values with 86.06 ± 14.34 MPa compared to all the resin composites with additional dry heat curing. The Filtek Z250 and Filtek Z350XT resin composites with and without additional dry heat curing presented significantly higher microflexural strength versus the SR Nexco (p < 0.05) and Tetric N-Ceram (p < 0.05) resin composites. In addition, the Filtek Z350XT and Tetric N-Ceram resin composites with additional dry heat curing showed significantly higher microflexural strength (p < 0.05) compared to those without additional dry heat curing. Conclusions: The Filtek Z250 and Z350XT resin composites had significantly higher microflexural strength values with and without additional dry heat curing. In addition, the Filtek Z350XT and Tetric N-Ceram resin composites subjected to additional dry heat curing showed significantly higher microflexural strength compared to when they did not receive the same procedure, a situation that did not occur with the Filtek Z250 resin composite.

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Section: Discussionmentioning

confidence: 99%

Effect of Additional Dry Heat Curing on Microflexural Strength in Three Types of Resin Composite: An In Vitro Study

et al. 2022

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“…Regarding the number of specimens prepared, although the minimum established is 5, in this case, 10 specimens of each material and each thickness were prepared in order to obtain greater precision in the study, as in Haselton et al [ 13 ] and Canals [ 11 ]. Other authors used eight specimens for each study group [ 20 ] or even twelve specimens [ 17 ].…”

Section: Discussionmentioning

confidence: 99%

“…For the storage of the samples, this research chose to preserve them in artificial saliva at 37 ± 1 °C for 28 days. Authors such as Sezin M et al [ 20 ] also preserved their samples at the same temperature for 30 days. Ruttermann et al [ 21 ], Singh et al [ 17 ], and Poonacha et al [ 14 ] also opted for preservation of these in an aqueous or salivary medium.…”

Section: Discussionmentioning

confidence: 99%

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The Influence of the Thickness of the Materials for the Provisionalization in Minimally Invasive Restorations

et al. 2022

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This in vitro study aimed to determine the flexural strength and modulus of elasticity of two bisacrylic resins for temporary crowns at different thicknesses, i.e., Structur 3 and Structur Premium, and to compare them with each other. Sixty samples were prepared, thirty of each material, which were made at different thicknesses (1 mm, 1.5 mm, and 2 mm). The dimensions followed the UNE-EN ISO 178:2019 standard, with a length of 24 mm, a width of 10 mm, and the thicknesses described. Materials were subjected to a three-point bending test. For the modulus of elasticity, statistically significant differences were observed between the 1.5 mm and 2 mm thicknesses of Structur 3 material. For Structur Premium, statistically significant differences were observed between the thicknesses 1 mm and 1.5 mm as well as between 1 mm and 2 mm thickness. With respect to flexural strength, no statistically significant differences were observed for either material at the different thicknesses. Significant differences were observed between the materials for both flexural strength and modulus of elasticity, being higher for Structur Premium: Structur Premium has a higher flexural strength and modulus of elasticity than Structur 3. There are significant differences for the modulus of elasticity but not for the flexural strength between thicknesses.

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Resistencia a la flexión y módulo elástico de resinas de alta, mediana y baja densidad

Cited by 2 publications

References 11 publications

Effect of Additional Dry Heat Curing on Microflexural Strength in Three Types of Resin Composite: An In Vitro Study

Effect of Additional Dry Heat Curing on Microflexural Strength in Three Types of Resin Composite: An In Vitro Study

The Influence of the Thickness of the Materials for the Provisionalization in Minimally Invasive Restorations

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