Surface Roughness and Shear Bond Strength of Nanographene-Reinforced Polymethylmethacrylate
Year: 2024
Type: article
Abstract: The aim of this study was to compare the surface roughness and shear bond strength (SBS) of different polymethylmethacrylate (PMMA) materials to composite resin. Rectangular specimens (15x15x3 mm) were fabricated from 3 different PMMA resin materials [G-CAM (nanographene-reinforced PMMA), milled PMMA (CAD-Ivory CAD/CAM PMMA-based resin) and self-curing PMMA (Imident, Imicryl)]. (n=10) After polishing the surfaces of all samples with 600-800-1000 grid abrasive abrasives, respectively. Afterwards, the composite resin was applied to the specimen surface in a polytetrafluoroethylene mold. All of the specimens were then thermocycled. (5-55°C, 5000 cycles). While the surface roughness (Ra) was measured by using a non-contact profilometer, SBS was measured by using a universal testing machine at a crosshead speed of 1 mm/min. Obtained data were evaluated with 1-way ANOVA followed by the Tukey HSD (a=.05). There was a significant difference between the groups in terms of both Ra (p<0.001) and SBS (p<0.001). The self-curing PMMA specimens had the highest Ra (1.15 μm), while G-CAM (0.55 μm) and milled PMMA (0.53 μm) specimens had statistically similar Ra. The milled PMMA group had the highest SBS value (51.25 MPa), while the SBS to both G-CAM (34.36 MPa) and self-curing PMMA (31.22 MPa) specimens were lower. (p<0.001). Within the limitations of this study, nanographene-reinforced PMMA showed acceptable surface roughness (Ra) but lower shear bond strength compared to milled PMMA.
Source: International Dental Journal
Institution: Biruni University
Language: English
Subfield: General Dentistry
Field: Dentistry
Domain: Health Sciences
Open Access status: gold
Estimated APC paid: $2,550
OpenAlex ID: W4403517586