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Transverse maxillary deficiency may be associated with sagittal or vertical problems of the maxilla or mandible. It may contribute to unilateral or bilateral posterior crossbite, anterior dental crowding, and unesthetic black buccal corridors on smiling. An adequate transverse dimension is important for stable and proper functional occlusion. Surgically, assisted rapid palatal expansion has been the treatment of choice to resolve posterior crossbite in skeletally mature patients. The following case report presents an adult Class III skeletal patient with an anterior open bite and bilateral posterior crossbite which was treated by surgically assisted rapid maxillary expansion with satisfactory outcomes.

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The number and kind of oral appliances have proliferated in recent years as dentists have responded to the challenge to develop more sophisticated devices for the control of socially disruptive snoring and obstructive sleep apnea (OSA). Oral appliances are appealing because they are simple to use, reversible, portable, and appear to be quite safe. Anterior mandibular positioners are the most commonly used appliances. This article illustrates a simple modification of hyrax screw which can be used as a mandibular advancement device for the treatment of OSA.