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<p>The aim was to evaluate the surface roughness (Ra) and shear bond strength (SBS) of novel polymethylmethacrylate (PMMA)-based materials. Thirty rectangular specimens were prepared from three different PMMA-based materials: nanographene-reinforced PMMA, milled PMMA, and self-curing PMMA. All specimens underwent a polishing process and the Ra value was then recorded using a non-contact profilometer. A special plate was then used to bond nanoflowable composite resin to the specimens' surfaces, after which they underwent thermocycling between 5 and 55&#xa0;°C for 5000 cycles. The SBS was subsequently evaluated at a crosshead speed of 1&#xa0;mm/min. One-way ANOVA and Tukey's HSD test (α = 0.05) were used for data analysis. The Ra and SBS values differed significantly (<i>p</i> &lt; 0.001). The self-curing PMMA specimens had the highest mean Ra value (1.15&#xa0;μm), while the G-CAM specimens had a mean Ra value of 0.55&#xa0;μm and the milled PMMA specimens had a mean Ra value of 0.53&#xa0;μm. SBS in the milled PMMA group was measured at 51.25&#xa0;MPa; SBS in the G-CAM and self-curing PMMA specimens was lower than in the milled PMMA specimens (34.36 and 31.22&#xa0;MPa, respectively). Although nanographene-reinforced PMMA exhibited an acceptable Ra value, its SBS value was lower than that of milled PMMA.</p>

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Surface roughness and shear bond strength of novel polymethylmethacrylate-based materials

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月25日

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  • Nursena Öztemel,
  • İrem Beril Yeşil Kurt,
  • Almira Ada Diken Türksayar

摘要

The aim was to evaluate the surface roughness (Ra) and shear bond strength (SBS) of novel polymethylmethacrylate (PMMA)-based materials. Thirty rectangular specimens were prepared from three different PMMA-based materials: nanographene-reinforced PMMA, milled PMMA, and self-curing PMMA. All specimens underwent a polishing process and the Ra value was then recorded using a non-contact profilometer. A special plate was then used to bond nanoflowable composite resin to the specimens' surfaces, after which they underwent thermocycling between 5 and 55 °C for 5000 cycles. The SBS was subsequently evaluated at a crosshead speed of 1 mm/min. One-way ANOVA and Tukey's HSD test (α = 0.05) were used for data analysis. The Ra and SBS values differed significantly (p < 0.001). The self-curing PMMA specimens had the highest mean Ra value (1.15 μm), while the G-CAM specimens had a mean Ra value of 0.55 μm and the milled PMMA specimens had a mean Ra value of 0.53 μm. SBS in the milled PMMA group was measured at 51.25 MPa; SBS in the G-CAM and self-curing PMMA specimens was lower than in the milled PMMA specimens (34.36 and 31.22 MPa, respectively). Although nanographene-reinforced PMMA exhibited an acceptable Ra value, its SBS value was lower than that of milled PMMA.