| 摘要 |
An orthodontic arch expander joins to a mouthpiece proximate to the rear of the mouthpiece. The transparent mouthpiece has a desired arc that fits over the teeth of the upper jaw. The mouthpiece has two wings that join near the incisors and then become parallel and spaced apart around the molars. Near the molars, an arch expander joins to the mouth piece. The arch expander has two telescoping shells with a threaded jack and cooperating springs. Each shell joins to a corresponding wing of the mouthpiece. Turning the jack lengthens a rod that pushes the shells outwards against the mouthpiece thus widening the maxillary arch without brackets or bands upon the teeth. An alternate embodiment has the arch expander attaching directly to the palatal bone through screws placed through a grommet at the end of each shell by an orthodontist or oral surgeon.
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