الفهرس | Only 14 pages are availabe for public view |
Abstract Background: Complete dentures are still one of the most common and effective treatment options for edentulous patients. Nowadays, conventional heat cured polymethylmethacrylate (PMMA) denture bases are replaced by digitally fabricated ones either by subtractive or additive manufacturing techniques. The mechanical and surface properties of 3D printed denture bases can be modified by incorporating fillers of different percentages to obtain properties comparable to those of heat cured denture bases. Aim of the study: The aim of this study is to evaluate the 3D printed denture base resin modified by nano-glass particles and carbon nanotubes regarding some important mechanical and surface properties. Plan of the study: 3D printed denture base resin will be modified using nano-glass particles and carbon nanotubes (CNTs). Both nano-glass particles and CNTs will be surface treated. The nano-glass particles will be treated using aminopropyl-triethoxy silane (APTES). CNTs will be functionalized using a mixture of nitric and sulfuric acid (1:3 by volume) and then silanized using APTES. After that the nano-fillers will be added to the 3D printed resin according to the following groups. group Ⅰ: with no nano-fillers (control), group Ⅱ: nano glass particles modified resin with two subgroups: subgroup ⅡA with 0.25% and subgroup ⅡB with 0.5% nano-glass particles by weight , group Ⅲ: CNTs modified resin with two subgroups: subgroup ⅢA with 0.25% and subgroup ⅢB with 0.5% CNTs by weight and group Ⅳ: nanoglass particles and CNTs modified resin with 0.25% by weight for each filler type. After that the specimens will be printed using a 3D printer and tested for flexural strength using a universal testing machine, impact strength using charpy’s impact tester and surface roughness using a surface profilometer. The specimens will be also assessed for nano-fillers distribution and fracture pattern by Scanning electron microscopy. Analysis: Data will be collected, tabulated, and analyzed using the appropriate statistical methods. Keywords: Nano-glass, Carbon nanotubes (CNTs),3D printing, Denture base. |