Mechanical and bonding properties of different combinations of nanohybrid and bulk-fill composites.

Beatriz A Ferrari, María M Asueta, Laura G Fusaro, Andrea E Kaplan
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Abstract

The aim of this research was to determine compressive and shear bond strength of blocks prepared with bulk-fill and nanofill composite resin combinations. Materials used were Filtek Bulk Fill (FBF) and Z350 (both 3M-ESPE) and Surefil SDR flow (SFF) - Dentsply. To determine shear bond strength, cylindrical specimens 10 mm thick were prepared with composite consisting of thicknesses of 6 mm of one material and 4 mm of the other, in the following combinations: G1: FBF- FBF; G2: Z350-Z350, G3: FBF-Z350, G4: Z350-SFF and G5: SFFSFF. Materials were cured using a 1100 mw/cm2 light for 20 seconds for each layer. Samples were stored for 24 hours at 37 °C in distilled water and shear bond strength was determined. To assess compressive strength, cylindrical samples 4 mm diameter and 6 mm thick consisting of 4 mm + 2 mm were used in the same combinations as described above, stored in distilled water at 37 °C for 24 hours, after which compressive strength was determined. Both tests were performed with a Universal testing machine at a cross head speed of 1 mm/min. Results were analyzed with ANOVA and Tukey's test. Means and standard deviations in MPa for each group were the following: Shear bond strength: G1: 435.87 (65.86), G2: 233.6 (108.15), G3: 279.2 (22.05), G4:449.1 (109.35) and G5: 196.6 (51.16). Compressive strength: G1:160.07(4.27), G2: 149.49 (14.06), G3: 156.10 (29.99), G4: 199-30(39.28), G5: 171.23 (28.71). Evaluation with ANOVA showed no significant differences among combinations for compressive strength (p>0.05) and significant differences for bond strength (p<0.05). Tukey's test showed three homogeneous groups. Under these experimental conditions, it can be concluded that the study combinations have adequate mechanical behavior, equivalent to materials used individually. However, shear bond strength was affected by the combinations analyzed.

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纳米杂化和块体填充复合材料不同组合的力学和粘结性能。
本研究的目的是确定块体填充和纳米填充复合树脂组合制备的块体的抗压和剪切粘结强度。使用的材料是Filtek Bulk Fill (FBF)和Z350(均为3M-ESPE)和Surefil SDR flow (SFF) - Dentsply。为测定抗剪粘结强度,采用一种材料厚度为6mm,另一种材料厚度为4mm的复合材料制备10 mm厚的圆柱形试样,组合方式如下:G1: FBF- FBF;G2: Z350-Z350, G3: FBF-Z350, G4: Z350-SFF, G5: SFFSFF。使用1100 mw/cm2的光固化材料,每层固化20秒。样品在37℃蒸馏水中保存24小时,测定剪切粘结强度。为了评估抗压强度,将直径为4mm,厚度为6mm,由4mm + 2mm组成的圆柱形样品以上述相同的组合使用,在37°C的蒸馏水中保存24小时,然后测定抗压强度。两项试验均在通用试验机上进行,十字头速度为1 mm/min。结果采用方差分析和Tukey检验进行分析。各组MPa均值和标准差分别为:G1: 435.87 (65.86), G2: 233.6 (108.15), G3: 279.2 (22.05), G4:449.1 (109.35), G5: 196.6(51.16)。抗压强度:G1:160.07(4.27), G2: 149.49 (14.06), G3: 156.10 (29.99), G4: 199-30(39.28), G5: 171.23(28.71)。方差分析结果显示,组合抗压强度差异无统计学意义(p>0.05),粘结强度差异有统计学意义(p>0.05)
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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