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Mechanical properties of surface-charged poly(methyl methacrylate) as denture resins.

Park SE, Chao M, Raj PA - Int J Dent (2009)

Bottom Line: Resins with increased methacrylic acid content exhibited lower strength values for the measured physical properties.The most significant decrease occurred as the methacrylic acid content was increased to 20% mPMMA.No significant differences at P < .05 were found in all parameters tested between the Control and 5% mPMMA.

View Article: PubMed Central - PubMed

Affiliation: Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA.

ABSTRACT
The aim of this study was to examine the mechanical properties of a new surface-modified denture resin for its suitability as denture base material. This experimental resin is made by copolymerization of methacrylic acid (MA) to poly(methyl methacrylate) (PMMA) to produce a negative charge. Four experimental groups consisted of Orthodontic Dental Resin (DENTSPLY Caulk) as a control and three groups of modified PMMA (mPMMA) produced at differing ratios of methacrylic acid (5 : 95, 10 : 90, and 20 : 80 MA : MMA). A 3-point flexural test using the Instron Universal Testing Machine (Instron Corp.) measured force-deflection curves and a complete stress versus strain history to calculate the transverse strength, transverse deflection, flexural strength, and modulus of elasticity. Analysis of Variance and Scheffe Post-test were performed on the data. Resins with increased methacrylic acid content exhibited lower strength values for the measured physical properties. The most significant decrease occurred as the methacrylic acid content was increased to 20% mPMMA. No significant differences at P < .05 were found in all parameters tested between the Control and 5% mPMMA.

No MeSH data available.


Related in: MedlinePlus

The mean and standard deviation values for Young's modulus of elasticity for each of the experimental groups.
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fig4: The mean and standard deviation values for Young's modulus of elasticity for each of the experimental groups.

Mentions: Figure 4 shows the mean and standard deviation values for Young's modulus of elasticity for each of the experimental groups. The elastic modulus is a measure of the stiffness of the material. The higher the elastic modulus is, the more the material will exhibit a lower elastic deformation per unit of stress applied. A comparison between the mean modulus of elasticity of the Control and the 5% mPMMA group revealed no significant difference. The 20% mPMMA group exhibited the lowest modulus of elasticity, which was significantly lower than both the 5% mPMMA group and the commercially available Dental Resin (P < .05). Thus, the 20% mPMMA group demonstrated the lowest elastic modulus, translating into the least stiff material. The 10% mPMMA group did not show any significant difference from the Control or the 5% mPMMA group.


Mechanical properties of surface-charged poly(methyl methacrylate) as denture resins.

Park SE, Chao M, Raj PA - Int J Dent (2009)

The mean and standard deviation values for Young's modulus of elasticity for each of the experimental groups.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2836823&req=5

fig4: The mean and standard deviation values for Young's modulus of elasticity for each of the experimental groups.
Mentions: Figure 4 shows the mean and standard deviation values for Young's modulus of elasticity for each of the experimental groups. The elastic modulus is a measure of the stiffness of the material. The higher the elastic modulus is, the more the material will exhibit a lower elastic deformation per unit of stress applied. A comparison between the mean modulus of elasticity of the Control and the 5% mPMMA group revealed no significant difference. The 20% mPMMA group exhibited the lowest modulus of elasticity, which was significantly lower than both the 5% mPMMA group and the commercially available Dental Resin (P < .05). Thus, the 20% mPMMA group demonstrated the lowest elastic modulus, translating into the least stiff material. The 10% mPMMA group did not show any significant difference from the Control or the 5% mPMMA group.

Bottom Line: Resins with increased methacrylic acid content exhibited lower strength values for the measured physical properties.The most significant decrease occurred as the methacrylic acid content was increased to 20% mPMMA.No significant differences at P < .05 were found in all parameters tested between the Control and 5% mPMMA.

View Article: PubMed Central - PubMed

Affiliation: Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, 188 Longwood Avenue, Boston, MA 02115, USA.

ABSTRACT
The aim of this study was to examine the mechanical properties of a new surface-modified denture resin for its suitability as denture base material. This experimental resin is made by copolymerization of methacrylic acid (MA) to poly(methyl methacrylate) (PMMA) to produce a negative charge. Four experimental groups consisted of Orthodontic Dental Resin (DENTSPLY Caulk) as a control and three groups of modified PMMA (mPMMA) produced at differing ratios of methacrylic acid (5 : 95, 10 : 90, and 20 : 80 MA : MMA). A 3-point flexural test using the Instron Universal Testing Machine (Instron Corp.) measured force-deflection curves and a complete stress versus strain history to calculate the transverse strength, transverse deflection, flexural strength, and modulus of elasticity. Analysis of Variance and Scheffe Post-test were performed on the data. Resins with increased methacrylic acid content exhibited lower strength values for the measured physical properties. The most significant decrease occurred as the methacrylic acid content was increased to 20% mPMMA. No significant differences at P < .05 were found in all parameters tested between the Control and 5% mPMMA.

No MeSH data available.


Related in: MedlinePlus