Comparison of the effect of modified and unmodified silicon nanoparticles on moisture absorption and mechanical properties of dental samples made of polymethyl methacrylate

Golshokouh, Mohammad Ali; Refahati, Nima

doi:10.22075/ijnaa.2024.35368.5265

Comparison of the effect of modified and unmodified silicon nanoparticles on moisture absorption and mechanical properties of dental samples made of polymethyl methacrylate

Articles in Press

Document Type : Research Paper

Authors

Mohammad Ali Golshokouh

Nima Refahati

Department of Mechanical Engineering, Damavand Branch, Islamic Azad University, Damavand, Iran

10.22075/ijnaa.2024.35368.5265

Abstract

In this study, the effect of adding modified and unmodified silicon nanoparticles with different weight percentages (0,2, 5, 7, and 10 wt%) on the amount of moisture absorption in environments with different PH (5, 6, 7, 8, 9) Also, the fracture toughness of polymethyl methacrylate samples have been discussed. The fracture toughness was tested by the three-point bending method according to the ASTM D5045 standard and the amount of moisture absorption according to the absorption test according to the ASTM D570 standard. Production samples by compression molding method, were evaluated in terms of structure and properties using SEM method. SEM images show that up to 7% by weight of the filler, the dispersion of silicon particles in the modified silica state is significantly better than in the unmodified silica, but at 10% by weight of the filler, the dispersion of the particles in the two modified states and unmodified is similar and not uniform. Experimental results show that increasing silicon improves the fracture toughness of parts made with unmodified silicon up to 2% by weight of filler, but for parts made with modified silicon up to 7% by weight of fracture toughness but this improvement is optimal when 5% by weight of silicon is used. Also, increasing silicon has increased moisture absorption in both groups of samples produced with modified and unmodified silica, so that as the percentage of filler increases, the rate of moisture absorption increases. On the other hand, as the acidity or alkalinity of the liquid progresses to neutral, the reaction between the base polymer molecules and the test liquid decreases, increasing moisture absorption. No significant difference was observed between moisture absorption in the modified and unmodified silicon.

Keywords

Polymethyl methacrylate

Modified silica nanoparticles

Unmodified silica nanoparticles

Fracture toughness

Moisture absorption

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