Effect of incorporation of nanoclay on the properties of heat cure denture base material: An In vitro study

Abstract

Purpose: The aim of the study was to evaluate the effect of incorporation of organically modified nanoclay in 1%, 3%, and 5% by weight on the flexural strength, surface hardness, and linear polymerization shrinkage of heat cure denture base material. Materials and Methods: One hundred and twenty specimens of heat-polymerized acrylic resin were fabricated. The specimens were divided into four groups ( n = 10) coded I to IV. Group I was the control group (unmodified acrylic resin specimens). The specimens of the remaining three groups were reinforced with nanoclay (organically modified montmorillonite) nanoparticles to achieve loadings of 1%, 3%, and 5% by weight. The resulting nanocomposites were subjected to mechanical testing and were characterized using X-ray diffraction, scanning electron microscope, and transmission electron microscope. Results: The statistical analysis showed that there was no significant increase in flexural strength within and between the groups. The most significant increase in surface hardness was observed between Group I (control) and Group II (1% nanoclay). Linear polymerization shrinkage of the specimens showed a significant decrease in the control and all the experimental groups. Conclusion: Addition of 1 wt% nanoclay to polymethyl methacrylate heat cure denture base material could enhance the surface hardness and reduce the linear polymerization shrinkage of the resin. However, there was no significant increase in flexural strength of the resulting nanocomposite.

Mechanophysical and Anti-Adhesive Properties of a Nanoclay-Containing PMMA Denture Resin

“…56−58 The addition of NCs to PMMA is expected to The negative impacts of nanoclay addition to the PMMA denture resin on the mechanical properties have been demonstrated in previous studies. 59,60 However, polymer− clay materials have been reported to significantly enhanced the mechanical and thermal properties of nanocomposite materials (e.g., polyimide-clay) when the organically modified clay is fully exfoliated and dispersed upon combining with polymer materials. 61 A previous study reported a significant increase in the flexural mechanical properties of the PMMA denture base resin by the addition of 0.25−0.5 wt % organoclay doublemodified with 3-trimethoxysilylpropyl methacrylate.…”

Impact of Cerium Oxide Nanoparticles Incorporation on Water Sorption and Solubility of Acrylic-Based Denture Soft Lining Material

“…Hence, it is imperative to inspect and replace soft liners regularly [19]. Various agents or fillers, such as nanoparticles, have been included in these materials, and their properties have been investigated to assess their potential to mitigate the adverse effects of soft lining materials [20][21][22]. Soft denture liners' physical and mechanical properties experience significant enhancement with the incorporation of inorganic nanoparticles, even when used in small quantities [23,24].…”

Protocols of improvements for PMMA denture base resin: An overview

“…PMMA became the favored polymer for fabricating denture bases because of its required features like easy handling and processing, low cost, ease of repair and polishing, good appearance, and biocompatibility [1][2][3]. Nevertheless, this material has shortcomings such as poor wear resistance, inadequate surface hardness, polymerization shrinkage, and low strength [3][4][5]. Although numerous polymers have been advanced to be used as denture bases, PMMA continues to be the preferred material for removable prostheses [1,2,6].…”

“…Also, the repairs of detached teeth and midline breakages were 30% and 29%, respectively [8]. One technique is to enhance the mechanical performance of PMMA via the incorporation of reinforcing additives [4,5,9]. Other approaches contain modification of the PMMA chemical structure via copolymerization [10][11][12] or the addition of chemical solutions such as cross-linking agents [13][14][15].…”