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Abstract

In clinical, the maxillary transverse development insufficiency of the patients often have the posterior crossbite and arch narrow circumstances, there are some impact in the pronunciation, chewing functions, and even for appearance. In childhood, these problems can be improved by rapid palatal expander correction device to stimulate the maxilla suture zone growth and development. However, the adult’s palate suture zones have been closed; if the maxilla needs to do a significant expansion, it often has to assist by the way of surgery to resolve. This report presents two examples of these adult cases utilize wearing the removable ball-type palatal expander and the slow adjustment of the device, according to the principle of bone remodeling, to guide the maxilla for limited lateral expansion. After several months of treatment, the narrow upper dental arch, posterior cross-bite and other issues are improved effectively.

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