Which of the following is NOT a type of functional appliance?

Functional appliances are designed to facilitate the growth and development of the jaw and to influence the positioning of teeth through functional stimuli. They are typically used to modify skeletal relationships and promote the proper alignment of teeth.

The edgewise, Begg, and Tip-Edge appliances are all categories of fixed orthodontic appliances that utilize various mechanics and archwire systems to achieve tooth movement, but they are not primarily classified as functional appliances. Instead, they focus on the aesthetic arrangement of teeth within the dental arch rather than modifying jaw relationships actively.

On the other hand, powered appliances, which may include mechanisms that employ external forces or appliances with motors, are not confined to traditional orthodontic mechanics. These devices often interact with functional elements, enabling more significant changes in skeletal relationships. Therefore, they can be classified as functional appliances as they might influence the position of the jaw in relation to the teeth.

This distinction is why powered appliances are not categorized with the other appliance types listed, making it clear why this choice stands out as the correct answer.