What mechanism is used in a removable appliance to retract proclined lower incisors?

Removable appliances can effectively create movement in specific teeth, and using spring-loaded screws is a common mechanism to achieve this. When the screw is activated, it exerts a force that can retract proclined lower incisors by applying pressure in the desired direction. This type of appliance allows for adjustable force application, enabling orthodontists to fine-tune the movement according to the individual patient's needs.

In contrast, invisible aligners, lingual arches, and fixed braces serve different purposes or utilize different mechanisms for tooth movement. Invisible aligners use a series of clear, custom-made trays to shift teeth gradually, while lingual arches primarily provide anchorage and support rather than direct retraction of incisors. Fixed braces, although effective for various tooth movements, are not classified as removable appliances. Therefore, the most appropriate mechanism for retracting proclined lower incisors in this context is indeed the use of spring-loaded screws within a removable appliance.