Citation Information :
Jassim BM, Mehdi R, Ismail IJ, Ibrahem FJ. The Effect of Addition Nanoparticles Kraft Lignin to the Acrylic-based Provisional Restorations Crown and Bridge. World J Dent 2022; 13 (6):574-581.
Aim and objective: To evaluate the effect of adding nanoform of biopolymer kraft lignin (KL) as reinforcement material as it had many functional groups to the acrylic-based provisional restorations crown and bridge for improving their properties.
Materials and methods: The specimens were grouped according to the powder of nano KL which was added to the acrylic resin after sonication with the methyl methacrylate monomer in percentages of 0.5, 0.75, and 1.0% to be in four groups with the control without addition. In total, 112 specimens (28 per each test) were cured and fabricated to evaluate some mechanical properties, for transverse strength test, hardness test, surface roughness, and specimen for impact strength test, results were analyzed using Statistical Package for the Social Sciences.
Results: Highly significant increase was obtained (p < 0.05) among the groups, in transverse strength (87.3243 N/mm2); impact strength (9.1071 kJ/m2) at 1.0 wt% group, which is the highest value; and hardness number concentration of KL 1.0% which had the highest mean value (84.0943); while the result indicates an increase in the surface roughness values than the control.
Conclusion: Using such material KL in nanoform has a positive effect on the mechanical properties which are tested in acrylic used for crown and bridge, especially in the (1.0%) addition KL further study could be done for higher percentage.
Clinical significance: According to this novel addition which indicated that lignin as a nanoparticle may have had interaction among the polymer matrix. So, it may anticipate in improving the mechanical properties by increasing the strength of the cold-cured acrylic resin.
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