Thermoset polymethacrylate-based materials for dental applications

Hassan, Muhammad; Asghar, Mehmood; Din, Shahab Ud; Zafar, Muhammad Sohail

doi:10.1016/b978-0-12-816874-5.00008-6

Cited by 42 publications

(48 citation statements)

References 110 publications

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“…At higher filler loadings, the FS of a denture base resin is reduced; (4) The FT of a denture base resin increases provided that there is an interfacial adhesion between the reinforcing agent and a denture base resin; (5) The agglomeration of the reinforcing agents increases the SH of a material. Decreased microhardness at elevated loadings might suggest that the denture base resin is not reinforced adequately or the EM of a reinforcing agent is lower than that of the resin itself; (6) Agglomeration or a loosely attached reinforcing agent in a resin matrix decreases the IS; (7) The hybridization of fillers in denture base resin seems to be a viable option.…”

Section: Discussionmentioning

confidence: 99%

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Influence of Reinforcing Agents on the Mechanical Properties of Denture Base Resin: A Systematic Review

et al. 2021

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Knowledge about the influence of fillers in denture base resin is vague. This systematic review aimed to report the reinforcing effect of fillers on the mechanical properties of denture base resin by following PRISMA guidelines. Two electronic databases (Pubmed/Medline & Web of Science) were searched for articles using the keywords: fibers in denture base, fillers in denture base, and reinforcement of denture base. Laboratory studies complying with the inclusion criteria were reviewed according to the set protocol. The established focus question was: “Do reinforcing fillers positively influence the mechanical properties of polymethyl methacrylate (PMMA) heat polymerized denture base material?” A total of twenty-nine relevant papers qualified for final inclusion. Of these, 24 were determined to have a moderate risk of bias. Micron or nano-sized metal/metal oxides particles and glass fibers were the frequently used reinforcing agents. The trend of evaluating fractural strength (FS) was common. Most of the studies limited the use of reinforcing agents up to 5 wt.%. FS, fracture toughness (FT), and impact strength (IS) tend to increase if the fillers are chemically bonded and well-dispersed in denture base resin. Though fillers with a higher elastic modulus increase the hardness of the reinforced denture base resin, they compromise other mechanical properties. Well-dispersed lower filler loading PMMA denture base resin can enhance the FS, FT, and other related mechanical properties.

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Section: Discussionmentioning

confidence: 99%

“…PMMA has been a widely used denture base resin for decades [4][5][6][7]. This material was reported for the first time by Redtenbacher in 1843 [1].…”

Section: Introductionmentioning

confidence: 99%

Influence of Reinforcing Agents on the Mechanical Properties of Denture Base Resin: A Systematic Review

et al. 2021

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“…Since 1937, poly(methyl methacrylate) (PMMA) is among the most used materials in denture fabrication due to its light weight, esthetic features, ease of processing and polishing, clinical manipulation, low cost, and stability in the mouth environment [ 2 ]. All these advantages have encouraged dentists to utilize it for decades as a denture base and dental restorative polymer [ 3 ]. Dentures are traditionally prepared by mixing a prepolymerized PMMA powder with methyl methacrylate (MMA) monomers in the liquid form and pouring the resulting mixture into dental molds [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Low Hydroxyapatite Loading Fraction on the Mechanical and Tribological Characteristics of Poly(Methyl Methacrylate) Nanocomposites for Dentures

et al. 2021

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Denture base materials need appropriate mechanical and tribological characteristics to endure different stresses inside the mouth. This study investigates the properties of poly(methyl methacrylate) (PMMA) reinforced with different low loading fractions (0, 0.2, 0.4, 0.6, and 0.8 wt.%) of hydroxyapatite (HA) nanoparticles. HA nanoparticles with different loading fractions are homogenously dispersed in the epoxy matrix through mechanical mixing. The resulting density, Compressive Young’s modulus, compressive yield strength, ductility, fracture toughness, and hardness were evaluated experimentally; the friction coefficient and wear were estimated by rubbing the PMMA/HA nanocomposites against stainless steel and PMMA counterparts. A finite element model was built to determine the wear layer thickness and the stress distribution along the nanocomposite surfaces during the friction process. In addition, the wear mechanisms were elucidated via scanning electron microscopy. The results indicate that increasing the concentration of HA nanoparticles increases the stiffness, compressive yield strength, toughness, ductility, and hardness of the PMMA nanocomposite. Moreover, tribological tests show that increasing the nanoparticle weight fraction considerably decreases the friction coefficient and wear loss.

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“…Poly methyl meth acrylate (PMMA) is the most widely accepted materials for denture base applications [1][2][3] because of its low cost, easy manipulation and convenience in repair [4][5][6]. However poor mechanical properties (lower modulus of elasticity, brittleness) and a high coefficient of thermal expansion are the reasons of its failure in the clinical practice [7,8].…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Techniques on Microhardness and Impact Strength of Conventional and Reinforced Heat Cured Acrylic Resin: A Comparative Study

Kiran¹,

Amin²,

Lone³

et al. 2021

Mater. Plast.

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This study determined and compared the influences of various processing techniques including air circulating oven (ACO), dry heat oven (DHO) and water bath (WB) on the impact strength (IS) and microhardness (HV) of the conventional heat cure acrylic resin (CHCAR) and rubber reinforced heat cure acrylic resin (RRHCAR). Samples were fabricated using CHCAR (control Group A; n=114) and RRHCAR (experimental Group B; n=114). Group A and B were further divided into subgroups according to processing techniques: ACO, DHO and WB (n=38 each) for both testing variables microhardness and impact strength (n=19 each). Charpy testing machine and Vickers microhardness tester were utilized. Analysis of variance was applied to determine the presence of significant differences among processing techniques while P-value ≤ 0.05 was considered as significant. Water bath (P-value [0.001) and DHO technique (p-value [0.001) showed significant differences between both groups� impact strength and microhardness. Microhardness of group A and B showed a significant difference (p-value 0.002) when processed by ACO. Impact strength and micro hardness were improved in RRHCAR compared to CHCAR processed by ACO and DHO in comparison to WB technique. Rubber reinforced heat cure acrylic resin revealed improvement in the impact strength and microhardness. The air circulating oven exhibited highest microhardness in both testing materials. Dry heat oven showed improved values of impact strength in conventional heat cure acrylic resin.

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Thermoset polymethacrylate-based materials for dental applications

Cited by 42 publications

References 110 publications

Influence of Reinforcing Agents on the Mechanical Properties of Denture Base Resin: A Systematic Review

Influence of Reinforcing Agents on the Mechanical Properties of Denture Base Resin: A Systematic Review

Effect of Low Hydroxyapatite Loading Fraction on the Mechanical and Tribological Characteristics of Poly(Methyl Methacrylate) Nanocomposites for Dentures

Influence of Processing Techniques on Microhardness and Impact Strength of Conventional and Reinforced Heat Cured Acrylic Resin: A Comparative Study

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