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The elastic modulus of soft denture liners

B Ellis, D J Lamb, S Al-Nakash

Journal of Biomedical Materials Research

|November 1, 1980

Summary

Soft denture liners, crucial for conditions like "denture sore mouth," have their Young's modulus accurately calculated using a specific formula. This modulus is influenced by strain rate and material changes like gellation.

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Area of Science:

Materials Science
Biomaterials Engineering
Dental Materials

Background:

Soft liners are used in dentures for comfort and treatment of conditions like "denture sore mouth."
These materials require precise mechanical property characterization for optimal performance.

Purpose of the Study:

To describe the measurement of the compression modulus (Ec) of soft denture liners.
To evaluate Gent and Lindley's method for calculating Young's modulus (E) from compression data.
To investigate factors affecting the Young's modulus of these materials.

Main Methods:

Measurement of compression modulus (Ec) on soft rubberlike materials.
Application of Gent and Lindley's formula: Ec = E(1 + 2kS²), with k=1 for soft rubbers and S as the shape factor (radius/2 × thickness).
Analysis of Young's modulus under varying rates of strain (tension and compression).

Main Results:

Young's modulus (E) can be reliably calculated from compression modulus (Ec) using the provided formula.
Young's modulus exhibits a linear relationship with the logarithm of the strain rate for both tension and compression.
Gellation (ethanol loss) increases Young's modulus, while brine immersion maintains elastic modulus stability over time.

Conclusions:

The study provides a validated method for determining the Young's modulus of soft denture liners.
Understanding the influence of strain rate and gellation is critical for predicting liner behavior.
Soft denture liners demonstrate stable elastic properties in a saline environment over extended periods.

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