Excellent Invisalign First Result with ARCH expansion but not SKELETAL expansion 

Invisalign First is an excellent option for crowing cases that don't actually require skeletal expansion and a fixed metal Rapid Palatal Expander that parents have to "turn with a key". The is another option for skeletal expansion called the Invisalign Palatal Expander (IPE) but this video depicts a result achieved only with aligners.