Abstract
The purpose of this study was to determine whether opening of the midpalatal suture occurs during treatment of posterior cross-bites by means of a Porter or W appliance. In eight of the ten cases treated there was radiographic evidence of midpalatal suture opening. Posterior cross-bite correction with a Porter or W appliance may occur either by a combination of midpalatal suture opening and buccal tipping of posterior teeth or by buccal tipping alone.
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