The Impact of Adding Silanized Microcrystalline Cellulose on Some Properties of Heat-Cured Acrylic Denture Base Material
Introduction: The most widely used material for dentures fabrication is acrylic resin. However, it doesn’t fulfil all the criteria required for a good denture base material as it has an insufficient surface hardness, inadequate impact strength, low strength, and brittleness.
Aim of the study: The aim of this study was to evaluate the effect of silanized microcrystalline cellulose addition on the impact strength, surface hardness, and surface roughness of heat cured acrylic.
Materials and methods: Microcrystalline cellulose was milled and surface treated with (3-Aminopropyl) trimethoxysilane. Ninety specimens were fabricated and divided according to the tests into three main groups. Each main group was then subdivided into three subgroups: the control group and experimental groups of 1% wt. microcrystalline cellulose and 1.5% microcrystalline cellulose with ten specimens for each subgroup. Impact strength, surface hardness, and surface roughness were then tested by using Charpy impact testing machine, Shore D durometer, and Profilometer device, respectively. The results were statistically analysed using one-way ANOVA test and Bonferroni multiple comparisons test (P=0.05).
Results: The results of impact strength revealed a statistically significant increase in impact strength after incorporation of 1% wt. of silanized microcrystalline cellulose and a statistically high significant increase occurred with the addition of 1.5%. For surface hardness and surface roughness, a statistically highly significant increase encountered after incorporation of 1% wt. and 1.5% wt. of silanized microcrystalline cellulose (P ≤ 0.01).
Conclusion: Silane treated microcrystalline cellulose improves impact strength, surface hardness, and surface roughness of heat cured acrylic.
Keywords: Acrylic resin, Microcrystalline cellulose, Silane coupling agent, Impact strength, Surface hardness