| Origins: Dentofacial Traction | ||
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| Origins: Dentofacial Traction | ||
| 3 of 5 | |
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A year later, Angell performed a similar procedure with a differentially threaded jackscrew connected across the palate to both bicuspids on one side and the 2nd bicuspid on the other (Angell, 1860). The patient was given a key to turn the screw and instructed to keep it uniformly firm. Upon her return 2 weeks later, she had developed a space between her central incisors, which Angell claimed "showed conclusively that the maxillary bones had separated".
Goddard, in 1893, further standardized the palatal expansion protocol (Goddard, 1893). He activated the device twice a day for 3 weeks followed by a consolidation period to allow the deposition of "osseous material" in the created gap. The description of his appliance is similar to the Hyrax appliance, being attached to the 1st bicuspids and 1st molars bilaterally.
FIG. 2.1.3. Angell’s palatal expansion device placed on the maxillary teeth. Copyright © 1860 American Dental Association. Reproduced with permission of ADA Publishing Co., Inc. from Angell EH. Treatment of irregularity of the permanent or adult teeth. Dental Cosmos 1860;1:540-544.
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