Unilateral tip-back mechanics are challenging because of a number of u
ndesirable side-effects associated with their use during orthodontic t
reatment. The purpose of this paper is to review the differential diag
nosis and treatment planning of Class II subdivision malocclusions and
present a treatment strategy based on a careful biomechanical analysi
s of the clinical situation. Emphasis is placed on the correction of m
olar axial inclination using unilateral tip-back moments in the treatm
ent of dental asymmetries. Appliance design and treatment sequencing a
re also discussed.