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Compressive creep of denture base polymers.

I E Ruyter, S Espevik

Acta Odontologica Scandinavica

|January 1, 1980

Summary

Heat-polymerized denture base materials exhibit lower creep rates compared to auto-polymerized types. Material composition and processing conditions significantly influence creep behavior and deformation mechanisms in denture bases.

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Area of Science:

Materials Science
Biomaterials Engineering
Dental Materials

Background:

Denture base materials are crucial for prosthetic tooth function and patient comfort.
Understanding the mechanical properties, such as creep, is essential for predicting material longevity and performance.
Heat-polymerized and auto-polymerized acrylic resins are common denture base materials with potentially different creep behaviors.

Purpose of the Study:

To investigate and compare the creep characteristics of heat-polymerized and auto-polymerized denture base materials.
To correlate creep rates with processing conditions and material composition.
To identify the underlying deformation mechanisms influencing creep behavior at various stress levels and temperatures.

Main Methods:

Creep tests were conducted on heat-polymerized and auto-polymerized denture base materials at temperatures of 23, 37, and 50 degrees C.
Secondary steady-state creep rates were measured and analyzed.
Creep data were correlated with processing conditions and material composition, and deformation mechanisms were investigated under different stress levels.

Main Results:

Heat-polymerized materials demonstrated the lowest secondary steady-state creep rates.
Two distinct creep mechanisms were observed: homogeneous deformation at lower stress levels (< 20-40 MNm⁻² at 37°C) and inhomogeneous deformation at higher stress levels.
Variations in creep rates among auto-polymerized materials were linked to differences in their composition.

Conclusions:

Heat-polymerized denture base materials offer superior resistance to creep compared to auto-polymerized alternatives.
Material composition and processing significantly impact creep resistance and deformation mechanisms in denture base resins.
Understanding these factors is vital for selecting and processing optimal denture base materials for clinical applications.

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