Dental Impression Materials Quiz

A negative reproduction of oral tissues, used to create a positive model.

A positive reproduction of teeth and surrounding tissues, made from a dental impression.

Characteristics of impression materials that improve clinical outcomes.

The amount of time the materials are workable in the mouth.

The time it takes for the impression material to harden.

Dental casts are used for various purposes in dentistry including case studies, diagnosis, treatment planning and creation of indirect restorations.

Dental restorations that are created outside the mouth.

Used to create a physical three dimensional replica of the patient's teeth and mouth.

The time allowed for mixing, loading, and positioning alginate in a patient's mouth.

The time it takes for alginate to chemically harden/set after mixing.

Alginate with a quick working time (1 min or less) and setting time (1-2 mins or less)

Alginate with a longer working time (2 mins) and setting time (up to 5 mins).

Store alginate in 100% relative humidity to prevent shrinkage/expansion.

Preparing study casts and gypsum models; removable partial dentures and athletic mouth protectors.

Cooler water increases setting time, warmer water shortens it.

A reversible hydrocolloid, providing good detail reproduction, but now less common due to complexity and time.

Impression materials are categorized based on how they set. There are thermoset materials (chemical reaction, irreversible) and thermoplastic materials (heat-based, reversible).

Impression materials that maintain a rigid shape after setting and are unsuitable for use in areas with undercuts (sharp inward curves).

Impression materials that can retain details and adapt to undercuts, creating a flexible mold.

A non-elastic impression material, commonly used for its rigid, strong structure, which doesn't easily bend.

A non-elastic but somewhat flexible impression material, used for its relatively quick setting time.

An elastic impression material that can adapt to undercuts.

Elastic impression materials used when fine details and undercuts are important.

A type of elastomeric impression material that is known for its flexibility and ability to capture fine details. It is commonly used for making impressions of edentulous patients and multiple tooth preparations.

Polysulfide impression material reacts with lead oxide, forming a rubber-like material and releasing water as a byproduct. This reaction leads to dimensional changes and necessitates immediate pouring of the impression.

Polysulfide impression materials have several drawbacks, including dimensional instability, hydrophobic nature, unpleasant odor, staining potential, and a relatively long setting time.

Polysulfide impression materials are flexible, have good tear strength, are biocompatible, and flow well, making them suitable for capturing fine details. They are also relatively inexpensive.

A type of silicone impression material that is less prone to shrinkage compared to polysulfides. It is often used for applications requiring precise detail capture but requires immediate pouring.

Materials used to capture the shape of teeth and surrounding tissues, providing a flexible and accurate impression. They are typically used to create casts for dental restorations or prosthetics. Examples: polysulfides, silicones, polyethers.

Polysulfide Impression Material is the most flexible of all elastomers, has good tear strength, is the most biocompatible and flows well for good detail reproduction.

Polysulfide impression material releases water during its setting process, which leads to shrinkage and dimensional instability. Therefore, it is essential to pour the impression immediately to ensure accuracy.

A method for taking dental impressions using two different viscosities of impression material, one for detail and one for bulk support.

Recording putty and wash together in a single step using the dual-viscosity technique.

Taking a putty impression first, then adding a layer of wash after it sets, without a gap between them.

Creating a space between putty and wash layers in a two-step impression.

Impression material with a runny consistency, perfect for capturing detail and flowing into small spaces.

Impression material with a thick consistency, used for bulk support and overall shape.

A digital impression taken using a camera, eliminating the need for traditional materials.

Taking a digital impression of teeth and gums using a handheld device.

A type of dental impression material known for its high accuracy, dimensional stability, and hydrophilic nature.

Polyether impression materials offer several advantages, including high accuracy, dimensional stability, good elastic recovery, compatibility with gypsum, and long shelf life.

A single-phase impression technique uses only one type of impression material, usually of medium viscosity, for both tray and syringe applications.

Both addition silicones and polyethers are well-suited for single-phase techniques because they exhibit shear thinning, meaning their viscosity decreases under pressure (when syringed).

The main disadvantages of polyether impression materials include their rigidity, potential for allergic reactions, high cost, and short working and setting times.

A two-step impression technique that uses two different viscosities of impression material, typically a heavier putty for the tray and a thinner wash for the details.

Spaced impression techniques use a spacer to create a gap between the teeth and the tray, while unspaced techniques do not utilize a spacer.

Shear thinning is a property of some materials where their viscosity (resistance to flow) decreases under pressure or force.