Noncompliant patients have frustrated orthodontists since the inception of the specialty,
and the problem only grows. It never diminishes. This has encouraged orthodontists to
develop various and sundry appliances, both intraorally and extraorally, to overcome this
reluctance in cooperation. Interestingly, the first of the apparatuses developed to enlist
patients’ total cooperation was the Saif spring, but no study was ever published in widely
read orthodontic literature regarding its use or effect. Class II Saif springs and Class II elastics
work in a similar manner, and the study presented here shows that some of the common
misconceptions about the harmful effects of Class II forces do not necessarily apply.
Most of the risks of Class II elastic forces can be controlled by careful planning and sound
biomechanics. World J Orthod 2003;4:206–214.