As per ADA No. 25, minimum amount of setting expansion required for type V gypsum productis
## Core Concept
The American Dental Association (ADA) specifications for gypsum products, particularly Type V, focus on their physical properties, including setting expansion. Type V gypsum products are used for making dental casts, dies, and other dental applications requiring high precision.
## Why the Correct Answer is Right
The ADA specification No. 25 outlines the requirements for gypsum products used in dentistry. For Type V gypsum products, which are intended for high-precision applications such as die materials, the specification includes a minimum setting expansion. This property is crucial because it affects the accuracy and dimensional stability of the dental casts or dies produced. A setting expansion of **0.10%** is specified as the minimum requirement, ensuring that the material can accommodate the clinical needs for precision and durability.
## Why Each Wrong Option is Incorrect
- **Option A:** *0.05%* - This value is lower than the specified minimum, potentially leading to inadequate dimensional change for precise dental work.
- **Option B:** *0.08%* - Although closer, it still does not meet the minimum requirement specified by the ADA for Type V gypsum products.
- **Option D:** *0.15%* - While this option might seem reasonable, it exceeds the minimum requirement but is not the specified minimum.
## Clinical Pearl / High-Yield Fact
Recall that Type V gypsum products have a **high setting expansion** compared to other types, which is critical for their application in dentistry, particularly for making dies. A key point to remember is that the ADA specifications are designed to ensure the quality and reliability of dental materials.
## Correct Answer: C. 0.10%.