National Dental Assisting Examining Board (NDAEB) Practice Exam

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Polysiloxane is categorized as what type of silicone impression material?

Addition
Condensation
Thermoplastic
Heat-cured

The correct answer is: Condensation

Polysiloxane is classified as an addition silicone impression material. This type of silicone is known for its dimensional stability, accuracy, and ease of handling. Addition silicones undergo a chemical reaction where silanes are added to form a stable cross-linked polymer, which results in minimal shrinkage and the ability to capture fine detail in dental impressions. The characteristics of addition silicones, including their hydrophilic properties and resistance to moisture, make them highly suitable for various dental applications, such as crown and bridge work, implants, and other restorations requiring precise impressions. Their superior properties in terms of accuracy and resistance to deformation also differentiate them from other types of silicone impression materials. In this context, the classifications like condensation silicones involve different chemical mechanisms and properties that do not align with the characteristics attributed to polysiloxane, highlighting the importance of understanding these distinctions in dental materials.