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  • A comparative evaluation of flexural strength of commercially available acrylic and modified polymethylmethacrylate: an in vitro study.

A comparative evaluation of flexural strength of commercially available acrylic and modified polymethylmethacrylate: an in vitro study.

The journal of contemporary dental practice (2013-04-13)
Teerthesh Jain, Naveen S Yadav, Amrita Pandita, S M A Feroz, U K Kartika, Praval Pratap Singh
ABSTRACT

The purpose of this study was to evaluate and compare the flexural strength of commercially available acrylic (trevalone) and modified polymethylmethacrylate (PMMA). Four groups were tested; Group 1- control group regular MMA, group 2-2% methacrylic acid, 88% MMA, group 3-16% methacrylic acid, 84% MMA group 4- 20% methacrylic acid, 80% MMA 15 resin specimens of each group were polymerized. After processing, the specimens were subjected for flexural strength testing using three point bending test in a Universal Testing Machine. All data was statistically analyzed with one-way ANOVA, differences within the groups were analyzed by Scheffe's analysis. As the ratio of incorporated methacrylic acid to PMMA increased, the flexural strength decreased. Analysis of data revealed a significant decrease in flexural strength of specimens (p < 0.000) after incorporation of 12%, 16%, 20% methacrylic acid to heat polymerized acrylic resin, when compared with the control group. Lowest flexural strength was observed with specimens containing 20% methacrylic acid and highest flexural strength was observed with specimens containing conventional monomer without methacrylic acid. It was observed that as the concentration of methacrylic acid in heat polymerized acrylic resin increases, the flexural strength decreases. Lowest flexural strength was observed with specimens containing 20% methacrylic acid and highest flexural strength was observed with specimens containing conventional monomer without methacrylic acid. The major advantages of addition of methacrylic acid to polymethylmethacrylate could be for the elderly people with restricted manual dexterity or cognitive disturbances, especially for patients who do not follow an adequate denture cleansing protocol and diabetic patients who are more susceptible for denture stomatitis.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Sodium methacrylate, 99%
Sigma-Aldrich
Poly(methyl methacrylate), isotactic, >80% isotactic
Sigma-Aldrich
Methacrylic acid, contains 250 ppm MEHQ as inhibitor, 99%
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 8,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 2,480,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 2,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 100,000
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 50,000
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Poly(methyl methacrylate), analytical standard, for GPC, 10,000
Sigma-Aldrich
Poly(methyl methacrylate)
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Methyl methacrylate, contains ≤30 ppm MEHQ as inhibitor, 99%
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Poly(methyl methacrylate), average Mw ~350,000 by GPC
Sigma-Aldrich
Poly(methyl methacrylate)
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Poly(methyl methacrylate), average Mw ~15,000 by GPC, powder
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, average Mw 97,000 (Typical), average Mn 46,000 (Typical)
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Poly(methyl methacrylate), analytical standard, for GPC, 4,000
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Methyl methacrylate solution, certified reference material, 1000 μg/mL in methanol
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Methyl methacrylate, 99%, stabilized
Supelco
Poly(methyl methacrylate), analytical standard, for GPC, 20,000