| Summary: | Posterior crossbite is defined as an inadequate transversal relationship of maxillary
and mandibular teeth. Even when eliminating the etiologic factors, this malocclusion
does not have a spontaneous correction, and should be treated with maxillary
expansion as early as possible. This treatment aims at providing a better
tooth/skeletal relationship, thereby improving masticatory function, and establishing
a symmetrical condyle/fossa relationship. Should posterior crossbite not be treated
early, it may result in skeletal changes, demanding a more complex approach.
Additionally, an overcorrection expansion protocol should be applied in order to
improve the treatment stability. Although the literature has reported a high rate of
relapse after maxillary expansion, the goal of this study was to demonstrate
excellent stability of the posterior crossbite correction 21 years post
treatment.
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