| 摘要 |
Improved Crozat appliances useful in the treatment of maxillary and/or mandibular dental malocclusion are provided by the present invention. The improved appliance consists of clasp means that have anterior and interior sections and which are adapted to engage the outer periphery of a molar or premolar on each side of the dental arch. The clasp means are interconnected with a body wire which has an essentially flat spiral spring formed in a segment thereof and adapted to exert a spring extension force against the clasp means. The improved Crozat appliances are prepared by (a) sectioning a maxillary or mandibular dental cast longitudinally to form lateral cast halves; (b) reconstructuring the section cast by locating the cast halves laterally of each other such that the cross-arch width distance between anatomical features of the cast halves correspond substantially to the cross-arch width distance of an ideal arch structure; and (c) constructing a Crozat appliance in substantial conformance to the reconstructed cast by forming clasp means to engage at least a portion of the outer periphery of a molar or premolar on each side of the dental arch of the reconstructed cast and interconnecting the clasp means with a body wire which has an essentially flat spiral spring formed in a segment thereof.
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