Appliance Purpose / Function:
- Rests on d’s & e’s or 4’s & 5’s
- Molar Distalizing Springs – .032 TMA Wire
- Acrylic Palate
- Lingual horizontal sheaths
- Bands on first molars
.032 TMA wire for molar springs
.032 to .036 Chromium Cobalt or Stainless-Steel for the rests and soldered / laser welded Hold Wire on molar bands
Appliance Fabrication Standards:
- The springs must have a 4mm helix positioned parallel to the palate on both sides of the midline approximately 2mm off the tissue. The arms of the springs must come out of the top of the helix and line up with the mesial edge of the first molars. The arms must contour to the curve of the palate just off the tissue and take a 90 degree bend into the mesial side of the lingual sheath. The acrylic retention portion of the spring must come out of the mesial side of the helix and extend approximately 8-10mm ending in 3 or 4 zig-zags for acrylic retention.
- If the appliance is to be a banded appliance bands will be present on 2 or more of the bicuspids. If bands are present on the bicuspids there must be a soldered wire on each band that extends into the acrylic button. A foot must run across the middle third of the band then the wire must form a 90 degree bend and extend towards the button. The wire must be as close to the tissue as possible without touching it. It must extend into the acrylic button at least 4mm and end in a 90 degree bend forming an acrylic retention foot.
- If the appliance is to be a bonded appliance, there will be no bands present on the bicuspids. In this case, occlusal rests must be placed on all bicuspids or primary molars present. The rests on the first bicuspids or first primary molars must approach the occlusal surface from the mesial side of the tooth and those on the second bicuspids or second primary molars must approach the occlusal surface from the distal side of the tooth. Each rest must be as long as the occlusal anatomy will allow in order to give the Client the most possible surface area to which to bond (this is all that will hold the appliance in place). From the occlusal surface, the wire must take a sharp bend towards the acrylic button. The wire must be as close to the tissue as possible without touching it. It must extend into the acrylic button at least 4mm and end in a 90 degree bend forming an acrylic retention foot.
- The acrylic button must cover the vault of the pallet with its borders extending to approximately 4mm away from the gingival margins of the bicuspids and anteriors
- Wherever possible the overall thickness must be approximately 2mm
- The edges of the button must be rounded and taper towards the tissue (thin, sharp knife-like edges not acceptable)