Question 132 · LDEK · Fixed appliances
The Hass appliance is used to:
- A. open the midpalatal suture.
- B. expand the anterior region of the upper arch.
- C. maintain space after a premature loss of primary molars.
- D. reinforce the anchorage of upper molars.
- E. reinforce the anchorage of lower molars.
Hint
Haas designed a tooth- and tissue-borne device with a central screw and acrylic palatal pads.
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