Which of the following appliances is not used for slow maxillary expansion?
Correct Answer: Hyrax appliance
Description: Hyrax appliance
This type of expander uses the Hyrax (hygienic rapid expansion) screw. It has heavy wires that are adapted, welded and soldered to the palatal aspects of the bands in the permanent molars. It is used for Rapid palatal expansion.
Examples of slow expansion:
Jack screw
Coffin spring
Quad helix appliance
Textbook of ORTHODONTICS Sridhar Premkumar
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Dental
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