| 摘要 |
Disclosed is an orthodontic retraction system that couples to vertical bracket slots, and that is compatible with continuous arches. In one aspect of the invention, a retraction spring that is formed of a high-strength elongate member of uniform cross-section has a stem at one end of the spring for engaging the vertical slot of a first tooth bracket, the stem being bendable for anchoring to the first tooth bracket; a shank extending from the other end of the spring for engaging a horizontally oriented auxiliary passage in a second tooth bracket, the shank also being bendable for anchoring to the second tooth bracket; and a T-shaped loop formed between the stem and the shank for biasingly connecting the tooth brackets. The disclosed system includes the spring and includes a plurality of the tooth brackets for rigid connection to corresponding teeth of a patient, each of the brackets having associated means for anchoring the continuous arch wire. The system is used by feeding the shank of the spring through the auxiliary passage, feeding the stem from the gingival through the vertical slot while applying sufficient moment for aligning the stem vertical, bending a protruding portion of the stem for locking the stem to the first bracket, and bending a protruding portion of the shank while holding the shank in an extending, tensioned condition, the spring transmitting a relatively large restoring moment along with tension forces for avoiding undesired tipping of the retracting teeth.
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