An Orthodontic Treatment Case of Unilateral Scissors Bite with Severe Crowding

Abstract

The patient, female and hereby discussed, was 24-year-6-month years old at the first examination. She had a unilateral scissors bite, occurred from the left first premolar to the second molar, and Angle Class II division 1 malocclusion with a severe crowding.
The orthodontic treatments given were a reduction in maxillary dental arch width and some improvement, which could be responded to an expansion into mandibular dental arch width, in the scissors bite on the left side. Appliances, used in sequence for maxilla through the treatment, were a reverse porter, a sliding plate and a lingual arch with arm. In the meantime, an expansion porter was applied for mandible. Considering the unilateral scissors bite, in these appliances ingenuity was devised in order for force system to be appropriate for each side, this actually means that its force system is different from the other side. After a remarkable recovery was observed regarding the left molar occlusion, we started to make an effort, with palatal arch and head gear, to maintain and to stabilise the recoverd left occlusion. Besides, she had extractions; maxillary rigth-and-left first premolars and mandibular left second premolar.
Thus the treatments were gradually provided and this patient eventually achieved both a functionally-stable occlusion and its normal occlusion for her individual personality.