Elastomeric impression materials used in modern orthopedic dentistry

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Abstract

This article presents a review of elastomeric impression materials currently used in orthopedic dentistry. The elastomer group is divided into silicone, polyester, and thiocol (polysulfide) materials. Silicone impression materials are widely used in orthopedic dentistry. Their structural basis is polymethylsiloxane with active terminal hydroxyl groups. Polyester materials consist of the main and catalyst components (pastes). The main component contains a polymer with imine groups, fillers, and plasticizers. Sulfonic acid ester is present in the catalyst paste. When these two components are mixed, ionic (cationic) polymerization occurs. Polysulfide materials are produced as base and catalyst pastes. The structural unit of the main paste is polysulfide or mercaptan rubber, and the catalyst paste acts as an oxidizer. Lead dioxide is often used as an oxidizer. The resulting polymer does not have a stereoregular structure, which causes its stickiness. It is technologically challenging to obtain a polymer with a stereoregular structure.

When theoretically comparing the listed types of elastomeric impression materials, according to their properties, chemical composition, advantages, and disadvantages, polyester and polysulfide impression materials can be distinguished as more advanced. Silicone materials have disadvantages; however, they are often used for domestic dentistry owing to the presence of domestic manufacturers and relatively low cost.

About the authors

Galina E. Bordina

Tver State Medical University

Email: gbordina@yandex.ru
ORCID iD: 0000-0001-6375-7981
SPIN-code: 1313-2983

Cand. Sci. (Biology), Associate Professor

Russian Federation, 4 Sovetskaya street, 170000 Tver

Nadezhda P. Lopina

Tver State Medical University

Email: n.lopina@internet.ru
ORCID iD: 0000-0002-7213-1531
SPIN-code: 1216-3570

Cand. Sci. (Chemistry), Professor

Russian Federation, 4 Sovetskaya street, 170000 Tver

Alexey A. Andreev

Tver State Medical University

Author for correspondence.
Email: aandreev01@yandex.ru
ORCID iD: 0000-0002-1012-9356
Russian Federation, 4 Sovetskaya street, 170000 Tver

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Supplementary files

Supplementary Files
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1. JATS XML
2. Fig. 1. Structural formula of polymethylsiloxane.

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3. Fig. 2. Curing mechanism of type I silicone impression materials.

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4. Fig. 3. Curing mechanism of type II silicone impression materials.

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5. Fig. 4. The mechanism of curing of polyester impression material.

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6. Fig. 5. The main raw material (thiocol) for the manufacture of polysulfide materials.

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7. Fig. 6. The mechanism of curing of polysulfide impression materials.

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