This Power Point is from the lecture I gave to the AAO as well as to the UBC orthodontic residents each year.


A half cusp over-correction of the upper first bicuspids as taught by Dr. Hans Pancherz who I had the

privilege of lecturing with.


The combination of Xbow plus RME X 6 is routinely used in Class II's for upper incisor and canine management.

The mini second molar tube is custom welded on the first bicuspid band in order to either maintain, intrude or

extrude the anterior six teeth.

The Xbow/RME X 6 is used to expand transversely as well as anterior-posteriorly.

In this case coil springs were used to procline the upper incisors.

This is an example of how the Xbow/RME X 6 appliance is used in a crowded Class II deep overbite case.

Dental decompensation and mandibular advancement surgery was declined.

Upper lip preservation in a convex profile with an obtuse naso-labial angle.


This is the day we switch from posterior to anterior bite turbos. It is time to erupt molars with

elastics, not intrude them with springs.



When a Class II spring is used on one side only the openbite that results requires good elastic cooperation

to resolve. It can result in canting of the anterior occulsal plane.

There is no anterior occlusal plane canting because there are no lower anterior brackets and archwire.

It is normal for lower incisors to be proclined in a Class II skeletal pattern. Casko showed that it happens in non-treated Class II skeletal cases with Class I occlusions.

Naturally occurring Class II skeletal with Class I dental with a non-protrusive upper incisor

Naturally occurring Class II skeletal with Class I dental with protrusive upper incisor