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Curing contraction of addition-type silicone impression materials.

M Ohsawa, K D Jörgensen

Scandinavian Journal of Dental Research

|February 1, 1983

Summary

Addition-type silicone impression materials were classified based on their curing contraction. Two distinct types emerged: one with minimal contraction and another exhibiting significantly higher polymerization and storage contraction.

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Area of Science:

Dental Materials Science
Polymer Chemistry

Background:

Addition-type silicone impression materials are widely used in dentistry.
Understanding their dimensional stability, specifically curing contraction, is crucial for accurate prosthodontic restorations.
Previous classifications may not fully capture the nuances of contraction behavior.

Purpose of the Study:

To quantify and classify the curing contraction of various addition-type silicone impression materials.
To differentiate materials based on their polymerization and storage contraction characteristics.

Main Methods:

The mercury bath method was employed to measure curing contraction.
Measurements were taken at 22°C at 15 minutes post-mixing and during storage for 24 hours.

Main Results:

Two distinct classifications of materials were identified based on contraction levels.
Type 1 materials exhibited polymerization contraction ≤0.08% and storage contraction ≤0.03%. Examples include Permagum, President, Reflect, and Reprosil.
Type 2 materials showed polymerization contraction >0.08% and significantly higher storage contraction. Examples include Exaflex and Xantogum.

Conclusions:

Addition-type silicone impression materials can be reliably classified into two groups based on their dimensional stability during curing.
This classification aids clinicians in selecting materials with predictable contraction for optimal clinical outcomes.
Material selection should consider the specific requirements for accuracy and stability in dental impressions.

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