Posterior Bite Plate with Labial Bow and Four Clasps

Appliance Purpose / Function:

• Acrylic plate
• Labial archwire
• Posterior bite plate
• Four clasps of your choice

Suggested Materials:

• Wire: Stainless-Steel wire or Chromium Cobalt

Options:
Finger Springs
Expansion Screws
Habit Cribs or Tongue Toys

Appliance Fabrication Standards:
Properly formed clasps for good retention. Wires crossing the occlusion can be left a little high so acrylic can encompass them making a stronger appliance. The models should be articulated and the blocks trimmed so they occlude evenly with the opposing dentition.
WIRE STANDARDS:

Designed with four clasps 2 on the first molars, 2 between the 1st and 2nd bi-cuspids and labial Bow; Clasping will depend on the Client’s preferences and the presence on bands.

Hawley Bow-

• Contact all anteriors in middle 1/3 of labial surface (may need to be lower on mandibular Hawley to avoid interference w/maxillary anteriors)
• Loops starting at canine prominence, 5-7mm long, positioned as close to tissue without touching as possible
• Mesial and distal sides of loops parallel to each other forming a perfect “U”
• Wire crossing occlusion distal to canine, wire must fit tightly in embrasure with no space underneath.
• Wire must fit snugly into the lingual side of the embrasure and follow the contour of the tissue with 1mm of space between it and the tissue (this will allow acrylic to flow behind the wire and fully encase it. Do not leave too much space here as this will cause the acrylic to be too thick in order to cover the wire.)

Clasping-

• Properly formed clasps for good retention.
• Clasping must fit tightly into embrasure with no space underneath. If 2nd molars are not present, the wire must fit snugly against the tissue to the distal of the first molars and extend over the patient’s alveolar ridge and into the palate where the acrylic is to be
• A 5mm foot must be bent on the end of the wire for acrylic retention.

Palatal Acrylic-

• Uniform overall thickness of approximately 2mm except in bite plate area (The models should be articulated and the bite plate trimmed to occlude evenly with the opposing teeth.)
• Bite plate must be built up over posterior teeth either to the level specified by the Client or to an amount sufficient enough to accomplish the desired function of the appliance. For example: if the Client wishes to use the appliance to jump a cross bite, the posterior bite plate must hold the patient open enough to allow the tooth in cross bite to be moved into a proper position
• The bite plate must be the approximate width of the posterior teeth which it is covering without excess bulk and the surface must be smooth and as flat as possible while still allowing for contacts with the opposing arch
• The tissue side of the plate is generally left alone unless otherwise requested by the Client, but it must be inspected for pits/voids or sharp areas. Pits/voids must be patched with acrylic, and sharp areas must be carefully ground smooth without removing too much acrylic