What is a temporary anchorage device (TAD), and what are common indications?

What is a temporary anchorage device (TAD), and what are common indications?

• A. A small bracket designed to aid ligation.
• B. A mini-implant screw used as skeletal anchorage; indications include canine retraction, molar intrusion, and space closure with controlled movement.
• C. An adjustable elastic chain.
• D. A palatal arch appliance.

Answer: (B)

Temporary anchorage devices are mini-implant screws placed into bone to provide a fixed skeletal anchor for tooth movement. They stay in place during treatment and are removed afterward, giving a stable point to pull or push teeth without relying on other teeth or patient cooperation. This allows targeted movements that are hard to achieve with traditional tooth-borne anchorage, such as retracting canines while keeping posterior teeth from moving, intruding molars to control vertical dimension, or closing spaces with precise, controlled movement. The description that matches this use is the one that defines the device as a mini-implant screw used as skeletal anchorage and lists indications like canine retraction, molar intrusion, and space closure with controlled movement. Other options describe a bracket for ligation, an adjustable elastic chain, or a palatal arch appliance, none of which function as skeletal anchorage devices.

Temporary anchorage devices are mini-implant screws placed into bone to provide a fixed skeletal anchor for tooth movement. They stay in place during treatment and are removed afterward, giving a stable point to pull or push teeth without relying on other teeth or patient cooperation. This allows targeted movements that are hard to achieve with traditional tooth-borne anchorage, such as retracting canines while keeping posterior teeth from moving, intruding molars to control vertical dimension, or closing spaces with precise, controlled movement.

The description that matches this use is the one that defines the device as a mini-implant screw used as skeletal anchorage and lists indications like canine retraction, molar intrusion, and space closure with controlled movement. Other options describe a bracket for ligation, an adjustable elastic chain, or a palatal arch appliance, none of which function as skeletal anchorage devices.