Silicone Rubber Technologies Quiz

A chemical reaction where a sulfur atom in a polysulfide material loses an electron. It's important for cross-linking (building a network of polymer chains) in polysulfides.

Increased temperature speeds up the cross-linking reaction in polysulfides, causing faster setting and increased strength.

Presence of water accelerates the cross-linking reaction of polysulfides, leading to faster setting. Even a single drop can significantly impact the process.

Polymeric materials that exhibit properties of both a solid and a liquid. They respond to stress like a solid and flow like a liquid over time.

The high flexibility of polysulfides allows them to deform and bend easily, enabling easy removal from undercuts or tight spaces without breaking.

A chemical substance added to a liquid to improve its wetting abilities, allowing for better adhesion and spreading.

Polysulfides are highly resistant to tearing, making them very durable and able to withstand significant stretching and pulling.

A special type of tray for taking impressions, made of acrylic and often used with polysulfide materials. It is thin (2-3mm) to help reduce polymerization shrinkage.

A type of non-aqueous impression material that can be deformed reversibly due to its long, coiled molecules. It's a flowable, low molecular weight polymer that sets to a rubber at room temperature when mixed with a reactor.

A type of synthetic rubber impression material that uses a condensation polymerization reaction to set. It's known for its good dimensional stability and is often available in multiple consistencies.

A type of synthetic rubber impression material that uses an addition polymerization reaction to set. It also offers good dimensional stability and is known for its ability to be electroplated.

A type of synthetic rubber impression material that uses a different chemical basis than silicones and polysulfides. It's known for its good tear strength and dimensional stability, but can't be electroplated.

A component of polysulfide impression materials that acts as the catalyst or accelerator. It initiates the polymerization reaction by oxidizing the SH groups in the base paste.

A component of polysulfide impression materials that helps to control the setting time. It slows down the reaction rate, ensuring the material has enough time to be placed and set properly.

The process by which polysulfide impression materials set, involving the reaction of lead dioxide with the base paste, resulting in cross-linking and the release of water.

A type of synthetic rubber impression material known for its dimensional stability, tear resistance and ability to be electroplated. It's used for crowns, bridges and inlays.

A type of silicone rubber impression material that sets through a condensation reaction, forming a three-dimensional network by cross-linking polydimethyl siloxane chains with alkylsilicates. It is supplied as a base paste and a liquid catalyst.

A catalyst used in condensation silicones that promotes the cross-linking reaction, leading to the formation of a rubbery network. Examples include tin octoate and dibutyl tin dilaurate.

The ability of a material to return to its original shape after being stretched or deformed. Condensation silicones exhibit high elastic recovery, meaning they almost completely return to their initial shape after being distorted.

A chemical reaction where two siloxane pre-polymers cross-link due to a platinum catalyst, resulting in an increase in viscosity and elastic properties.

A property of condensation silicones that makes them resistant to water and liquids. It is advantageous for dental impressions, as it prevents water from affecting the final model.

The process of forming a strong material by joining smaller molecules into a larger network. In silicone, this is achieved by using a catalyst to create cross-links between the siloxane pre-polymers.

A property of condensation silicones related to the ability to withstand tearing forces. Condensation silicones have adequate tear strength, but it is lower compared to polysulfide or polyether materials.

The amount of shrinkage that occurs when a material solidifies. For addition curing silicones, the shrinkage is very low, only around 0.05%.

A type of silicone rubber impression material that sets through an addition polymerization reaction. This type is known for its superior properties and comes as two pastes, a base and a catalyst.

A key component of addition silicones, containing vinyl groups that participate in the addition polymerization reaction. The catalyst contains a similar polymer with hydrogen atoms, forming a stronger network.

A gas released during the setting process of addition curing silicones. It can cause blisters if not properly managed.

Gloves that should NOT be used when working with addition curing silicones. The powder in latex gloves can interfere with the setting reaction.

A catalyst used in addition silicones, typically chloroplatinic acid. It initiates the polymerization reaction between the base and catalyst pastes, leading to the formation of a solid impression material.

A material that's applied as two pastes and sets through an addition curing reaction, offering excellent dimensional stability and elasticity. It's often used in crowns and bridges.

A material that sets through a cationic ring opening addition polymerization reaction. It's used in dentistry for taking impressions.

This property refers to the ability of a material to return to its original shape after being stretched or deformed. Addition curing silicones are known for their excellent elastic properties.

Polyether impressions are typically 4-6 mm thick to compensate for their stiffness.

Polyether impression material is the least flexible of all elastomeric impression materials. This can make it difficult to remove from the mouth.

Polyether is hydrophilic, meaning it absorbs water. This can affect dimensional stability if submerged for extended periods.

Polyether is compatible with various die materials, resulting in excellent surface finishes.

Polyether impression material is suitable for both stock and special trays, making it versatile in applications.

Polyether impression material is not suitable for electroplating because of its hydrophilic nature.

Polyether impression material can be disinfected with antimicrobial solutions. However, prolonged immersion can lead to dimensional changes.

Silicone rubber is a type of impression material used in dentistry. It's supplied as two pastes that are mixed together to form a rubber-like material capable of capturing fine details of the teeth and gums.

Silicone rubber impression material is known for its high elasticity, allowing it to bounce back to its original shape. This makes it ideal for capturing intricate details of the teeth.

Polyether rubbers exhibit a high level of elasticity (99.5%), making them excellent for capturing precise details of the teeth and gums. This property ensures accurate representation of the oral structures.

Silicone rubber impression material is prone to dimensional shrinkage, which occurs due to temperature differences between the mouth and the room, as well as variations within the product itself. This shrinkage can affect the accuracy of the final impression.

Polyether rubbers are subject to dimensional shrinkage, which occurs due to temperature differences between the mouth and the room. This shrinkage is generally minimal, typically around 0.05%, ensuring high dimensional accuracy for the final impression.

Silicone rubber impression material requires a surfactant to improve its ability to wet the surface of the teeth and gums. This ensures a smooth and accurate impression.

Polyether rubbers necessitate a surfactant for optimal wetability, enabling them to spread evenly over the teeth and gums, resulting in a clear and detailed dental impression.