## Core Concept
Active appliances in orthodontics refer to devices that apply force to teeth or jaw segments to effect movement or change. These can be fixed or removable and are designed to achieve specific orthodontic goals. Affixed active appliances are those that are attached directly to the teeth.

## Why the Correct Answer is Right
The correct answer, , represents examples of affixed active appliances. These are appliances that are directly bonded or cemented onto the teeth, providing a constant or intermittent force to guide tooth movement. Examples include **brackets** and **bands** used in fixed orthodontic appliances.

## Why Each Wrong Option is Incorrect
* **Option A:** This option does not accurately represent affixed active appliances.
* **Option B:** Similarly, this option does not correctly identify affixed active appliances.
* **Option D:** This option also does not accurately represent affixed active appliances.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **fixed appliances**, such as metal braces, are a common type of affixed active appliance. They are attached to the teeth for the duration of treatment and are highly effective for complex orthodontic movements.

## Correct Answer: B.