| 摘要 |
A direct-bonded fixed lingual orthodontic appliance system is provided which comprises a plurality of metal or plastic attachments which are designed to be cemented directly to the lingual surfaces of the teeth of a patient, of either the mandibular or maxillary arches, and an arch wire intercoupling the attachments extending around the lingual side of the teeth. The surface of the base of each of the attachments contacting the corresponding tooth is particularly configured so as to have intimate contact with the tooth. The attachments are shaped to provide maximum inter-bracket space, especially for the mandibular anterior teeth, so as to facilitate the insertion and securement of the arch wire. The wider the interbracket space the more expression of the arch wire can be achieved resulting in gentler pressures being applied at longer force moments. The thickness of each bracket combined with base thickness is designed to reduce the requirement for in-and-out bends in the arch wire. The attachments are also constructed to incorporate built-in torque and tip angulation correction properties for tooth positioning.
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