## **Core Concept**
Stationary anchorage in orthodontics refers to a type of anchorage where the anchor teeth do not move during the application of orthodontic forces. This concept is crucial in orthodontic treatment planning, ensuring that the forces applied to move teeth are effectively utilized without unwanted tooth movement.

## **Why the Correct Answer is Right**
The correct answer, , indicates that stationary anchorage refers to anchor teeth that are not intended to move during orthodontic treatment. This type of anchorage is often used when a group of teeth needs to be moved as a unit against a single tooth or a group of teeth that are anchored and do not move. Stationary anchorage can be achieved through various means, including the use of dental implants, mini-screws, or specific tooth movements that counterbalance each other.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is incorrect because it does not accurately describe stationary anchorage. Without specific details on what is, we can infer that it does not align with the definition of stationary anchorage.
- **Option B:** This option is incorrect as it also does not accurately represent the concept of stationary anchorage.
- **Option C:** This option is incorrect because it likely describes a different orthodontic concept or mechanism.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that stationary anchorage is critical in complex orthodontic cases, such as closing extraction spaces or intruding teeth. The use of temporary anchorage devices (TADs) like mini-screws has significantly enhanced the ability to achieve stationary anchorage, allowing for more predictable and efficient tooth movements.

## **Correct Answer:** . Not moved.