Silicone Rubber Impression Materials

Silicone Rubber Impression materials

Silicone elastomers provide the smallest details needed for impressions

The progress of stomatology relies on innovations in materials, equipment, and clinical operating procedures. For patients, materials and medical solutions with higher cost performance and better reputation are the decisive factors for their choice. As dental technicians, more convenient, faster, and more precise operating procedures are the basis for them to provide high-quality dental medical services.

How do you make a perfectly fitting, aesthetically pleasing restoration? To avoid the risks and costs of adjustments and rework? Impression materials are critical. The impression records the exact position of certain soft tissues, implants, and teeth, making it easy for the dentist to use this data to create a highly detailed plaster model.

Silicone rubber impression materials are non-recyclable (irreversible) elastomers and are especially suitable for replicating soft or hard oral tissues.

Soft, efficient setting silicone rubber materials are suitable for the largest, most regular cases. Especially for special patients with sensitive throats, providing speed to deal with this situation is key and can achieve sufficient clinical detail.

Silicone rubber impression material types and main components

The silicone material is cured at the temperature of the mouth, and two types are distinguished according to different polymerization conditions, namely polycondensation (Condensation) and polyaddition (Addition).

Condensation type key ingredient：

Hydroxy-terminated polydimethylsiloxane (Matrix)
Stannous octoate or ditin dilaurate (Catalyst)
Tetraethyl silicate (Crosslinking agent)
Silica (Filler)

Polyaddition key ingredient

VPS-Polyvinylsiloxane (Matrix)
Hydrogen polysiloxane (Crosslinking agent)
Chloroplatinic acid (Catalyst)
High-purity silica powder (Filler)

Addition-cure versus condensation-cure silicone rubber impression materials

No matter the above ingredients or the feedback from the clinical practice of dentists, it can be analyzed that the addition type is better than the condensation type. It not only has all the advantages of the condensation type but also provides the following advantages:

❐ Faster curing in the oral cavity (Crosslinking time 2-4 minutes)
❐ The temperature can be increased or the amount of catalyst can be increased as needed to speed up the solidification time
❐ The material complies with FDA certification and is safe for oral cavity
❐ Cross-linking throughout without release of by-products, very low shrinkage (Less than 0.1%), imparting excellent dimensional stability.

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Considerations for general impression material selection:

▣ Accuracy, authenticity, detail reproduction, repeatability
▣ Easy to maintain consistency and ensure no foaming
▣ Excellent hydrophilicity and wettability
▣ Affordable price
▣ Neutral smell
▣ Can withstand repeated physical or chemical disinfection
▣ Easy release from the mouth
▣ Good tear strength and impact resistance
▣ Long enough shelf life
▣ Cure Time Consistency
▣ Dimensional stability during early and late cure

With years of experience, Yongrui engineers have developed and produced efficient and stable addition-cure silicones dental impression materials. We provide materials with excellent hydrophilicity, controllable intraoral curing time, high elasticity, and low permanent set so that better control of the impression step when using them.

Yongrui chooses polysiloxane with high vinyl content to make materials, which provides the following advantages:

❐ Right mechanical properties (Tear resistance, hardness).
❐ It has high chemical stability and excellent biocompatibility.
❐ It is more convenient to use (According to the ratio of AB component 1:1).
❐ Not sticky.
❐ The effective working time is long, up to 30 days.
❐ Soakable for disinfection.
❐ Low shrinkage stress, ultra-low compression deformation, precision molding.
❐ Suitable for automatic mixing systems.

Our impression material formula can also reduce the resistance angle of water by adding modified silicone oil or other surfactants to improve the affinity with oral tissue, adapt to the moist environment of the oral cavity, and improve the accuracy of making dental models.

The selection of materials, the method of taking impressions, the mismatch of injection materials, and the wrong setting of curing time may all lead to insufficient detail of the impression, but the impression material is undoubtedly the most important. We can provide you with sufficient and controlled working time, and accurate, fast-curing existing models or provide custom dental impression materials according to your preferences (considering cost, future enhancements, patient acceptance, overall efficiency, and ease of use).

To customize your impression solution.