What is mandibular prognathism? what is "habsburg jaw"?

Extended lower jaw: Mandibular prognathism typicaslly refers to a condition in which the lower jaw outgrows the upper jaw. This results in a more forward position of the lower teeth and chin. It can be minor or major. Hapsburg jaw is a reference to the royalty of that name who demonstrated various degrees of this, often with deformity. If you look around, you will see people with this jaw position.

Lower jaw juts: Lower jaw juts out. Google hapsburg jaw to illustrate. Requires orthodontic and surgical correction.

Lower jaw larger: Lower jaw protrudes in front of the upper jaw.