Haas Palatal Expander
Appliance Purpose / Function:
The Haas Palatal Expander is both tissue and tooth borne providing expansive forces to both the teeth and the palatal vault.
Appliance Components:
- Bands on the 1st permanent molars expansion screw
- Swivel key for activation
- Occlusal rests on 1st bicuspids
Suggested Materials:
- Wire: Chromium Cobalt or Stainless-Steel wire
- Solder: Silver Solder (Cadmium Free)
Options:
- Laser welding (no solder)
- Face mask hooks
- Habit crib
- Archwire Tubes
- Headgear Tubes
Appliance Fabrication Standards:
- .036 lingual bar that extends to the 1st bicuspid and then turns into the palatal vault to support the palatal acrylic
- .036 wire turns from the band into the palatal vault to support palatal acrylic
- Wires should be 1 -1.5mm off the tissue
- The body of the RPE is as high in the palatal vault as possible without touching the tissue
- The RPE is aligned with the midline
- The body of the RPE should be about half way between the anterior teeth and the banded molars