J Adv Prosthodont.  2012 Feb;4(1):30-36. 10.4047/jap.2012.4.1.30.

Effect of fiber reinforcement on impact strength of heat polymerized polymethyl methacrylate denture base resin: in vitro study and SEM analysis

• Mowade TK
• Dange SP
• Thakre MB
• Kamble VD

• KMID: 2284781
• DOI: http://doi.org/10.4047/jap.2012.4.1.30

Abstract

PURPOSE
The aim of this in-vitro investigation was to describe the effect of reinforcement with different fibers on impact strength of heat polymerized polymethyl methacrylate (PMMA) denture base resin and to analyze the effect of surface treatment of the fibers on the impact strength.
MATERIALS AND METHODS
The specimens were fabricated from the dies formed as per standard ASTM D4812. 2% by weight of glass, polyethylene and polypropylene fibers were incorporated in the PMMA resin. The Izod impact testing was performed on the unnotched specimens and the values obtained were analyzed using appropriate one way ANOVA, followed by unpaired t-test. Fractured ends of the samples were subjected to the SEM analysis.
RESULTS
The polypropylene fibers with plasma treatment showed the highest impact strength (9.229 x 10(2) J/m) followed by the plasma treated polyethylene fibers (9.096 x 10(2) J/m), untreated polypropylene fibers (8.697 x 10(2) J/m), untreated polyethylene fibers (7.580 x 10(2) J/m), silane treated glass fibers (6.448 x 10(2) J/m) and untreated glass fibers (5.764 x 10(2) J/m). Also the surface treatment of all the fibers has shown the significant improvement in impact strength. Findings of the SEM analysis justified the improvement in impact strength after surface treatment.
CONCLUSION
Reinforcement with the fiber is an effective method to increase the impact strength of PMMA denture base resin. The surface treatment of fibers further increases the impact strength significantly.

Keyword

Glass fibers; Polypropylene fibers; Plasma treatment; Silane treatment; Izod impact test

MeSH Terms

Denture Bases
Dentures
Glass
Hot Temperature
Plasma
Polyethylene
Polymers
Polymethyl Methacrylate
Polypropylenes
Reinforcement (Psychology)
Glass
Polyethylene
Polymers
Polymethyl Methacrylate
Polypropylenes

Figure

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  Fig. 1 Izod impact testing machine with specimen in position.

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  Fig. 2 Fractured specimens from each group.

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  Fig. 3 SEM view of specimens. A: Group A, B: Group B, C: Group Bt, D: Group C, E: Group Ct, F: Group D, G: Group Dt.

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