Evaluation of Mechanical and Thermal Properties of Commonly Used Denture Base Resins

Purpose: The purpose of this investigation was to evaluate and compare the mechanical and thermal properties of 6 commonly used polymethyl methacrylate denture base resins. Materials and Methods: Sorption, solubility, color stability, adaptation, flexural stiffness, and hardness were assessed to det...

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Bibliographic Details
Published in:Journal of prosthodontics 2004-03, Vol.13 (1), p.17-27
Main Authors: Phoenix, Rodney D., Mansueto, Michael A., Ackerman, Neal A., Jones, Robert E.
Format: Article
Language:English
Subjects:
adaptation
Adsorption
Analysis of Variance
Calorimetry, Differential Scanning
Color
Dentistry
Denture Bases
differential scanning calorimetry
dynamic mechanical analysis
Hardness
Hot Temperature
Humans
Materials Testing
Microwaves
Pliability
PMMA
Polymethyl Methacrylate - chemistry
Solubility
Stress, Mechanical
Surface Properties
thermal analysis
Thermodynamics
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Summary:Purpose: The purpose of this investigation was to evaluate and compare the mechanical and thermal properties of 6 commonly used polymethyl methacrylate denture base resins. Materials and Methods: Sorption, solubility, color stability, adaptation, flexural stiffness, and hardness were assessed to determine compliance with ADA Specification No. 12. Thermal assessments were performed using differential scanning calorimetry and dynamic mechanical analysis. Results were assessed using statistical and observational analyses. Results: All materials satisfied ADA requirements for sorption, solubility, and color stability. Adaptation testing indicated that microwave‐activated systems provided better adaptation to associated casts than conventional heat‐activated resins. According to flexural testing results, microwaveable resins were relatively stiff, while rubber‐modified resins were more flexible. Differential scanning calorimetry indicated that microwave‐activated systems were more completely polymerized than conventional heat‐activated materials. Conclusion: The microwaveable resins displayed better adaptation, greater stiffness, and greater surface hardness than other denture base resins included in this investigation. Elastomeric toughening agents yielded decreased stiffness, decreased surface hardness, and decreased glass transition temperatures.
ISSN:1059-941X
1532-849X
DOI:10.1111/j.1532-849X.2004.04002.x