The Effect of Rice Husk-Derived Silica Incorporation on Heat-Cured Acrylic Denture Bases

Authors

  • Husam Mohammed Saeed
  • Rihab Amer Kareem Department of Prosthodontics/ College of Dentistry/ Ibn Sina University/ Iraq.
  • Ahmed Abed Marzook

DOI:

https://doi.org/10.5195/d3000.2026.1376

Keywords:

Dentures, Tooth Loss, Edentulism, Prosthodontics

Abstract

The present study in vitro study was designed to test the physico-mechanical properties of a heat cured PMMA-based denture base with different concentrations (5%, 7.5% and 10% by weight) of the silica microparticle obtained from rice husk (RH). Heat-cured PMMA was combined with high-purity silica microparticles (<0.5μm) recovered from RH ash. 200 specimens were prepared, with 40 specimens allocated for each test. The specimens were grouped into four categories based on their silica concentrations of 0, 5, 7.5, and 10%. A statistical analysis was performed using the one-way analysis of variance (ANOVA) and least significant difference (LSD) post-hoc test. Transverse strength significantly improved when the concentration of silica used was 7.5% of the RH derived silica for the best performance. There was an improvement in the wettability (lower contact angle), indicating enhanced hydrophilicity. But with increasing amount of filler, the surface hardness also obtained an equal enhancement. Surface roughness was slightly increased, however, which indicates potential for more plaque build-up unless proper polishing is performed. The surface and mechanical properties of the PMMA-based denture base were greatly improved with the RH-derived silica. The group with a silica concentration of 7.5% demonstrated optimal improvements, suggesting its potential as an effective and sustainable reinforcement for denture base materials.

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Published

2026-06-10

Issue

Vol. 14 No. 1 (2026)

Section

Adults & the Elderly

License

Copyright (c) 2026 Husam Mohammed Saeed, Rihab Amer Kareem, Ahmed Abed Marzook

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Revised 7/16/2018. Revision Description: Removed outdated link.