An 8-year-old boy with both permanent upper central incisors in crossbite; there is an anterior mandibular displacement on closure on 1̲/1̲ and a 5mm overbite on these incisors. 6edc21 are present in each quadrant.

1. Adams’ clasps 6̲/6̲.
2. Adams’ clasps d̲/d̲.
3. Posterior capping.
4. Z-spring(s).

An upper removable appliance incorporating these components is required to correct the anterior crossbite.