Invisalign and Biobloc have totally different purposes
A Biobloc is one type of functional applance whose primary goal is to improve the an overbite by holding the lower jaw forward in an attempt to stimulate lower jaw growth. It is bound to have mixed results because it only works on growing children and must be worn practically 24 hours a day. I am not aware of anyone in the US who uses this applaince on a regular basis, however I am imagine someone does.
Invisalign on other hand has a primary goal of...