Upper Modified Spring Clip Retainer

Appliance Purpose / Function:

Appliance Fabrication Standards:

ACRYLIC STANDARDS:

• Uniform overall thickness of approximately 2.5mm
• All wires and inlay pictures completely encased in acrylic on lingual portion
• Posterior border tapered towards the tissue with a rounded edge (thin, sharp knife-like edges not accept-able)
• Acrylic must be trimmed at the height of the gingival third of each posterior tooth and must not interfere with opposing cusps
• Acrylic must have full contact with all lingual sur-faces of every tooth involved in the requested plate design with the exception of the embrasures. There must be no “cupped out” areas around the teeth that can act as a food trap, instead the acrylic must butt directly against each tooth without dipping
• Acrylic in embrasures must be sufficient to prevent rotation of the teeth, but must have a rounded end to prevent a sharp uncomfortable point
• Spring apparatus must be cut out vertically along the line along the and around the lingual gingival margin of the canines avoiding the lingual omega loops then horizontally across the lower third insuring all acrylic is removed over and under the wire where these cuts meet to allow the spring to flex. These cuts must be clean and straight. A sufficient amount of the foot portion of the spring must remain embedded in the acrylic to retain the spring to the main plate
• The tissue side of the plate is generally left alone unless otherwise requested by the Client, but it must be inspected for pits or sharp areas. Pits must be patched with acrylic, and sharp areas must be care-fully ground smooth without removing too much acrylic

WIRE STANDARDS:

Labial Bow Spring Clip-

• Contact central and lateral incisors in middle 1/3 of labial surface. Note: wire can be positioned slightly off of teeth in this area due to labial acrylic being placed there but gap must be slight.
• Loop must contour to the gingival margin of the canine in a rounded V shape
• Crossing occlusion distal to canines wire must fit tightly into embrasure with no space underneath following the gingival margin on the lingual of the canines back up just above the cingulum. The spring must be finalized with one more additional omega loop to help with adjustment and activation.
• Wire termination 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.)
• A 5mm foot must be bent on the end of the wire for acrylic retention
• It must follow the long axis of the lateral incisors in the middle of the tooth and have a 2.5mm foot for acrylic retention

Clasps –

• The standard design has Adams clasps on the first molars. This may vary depending on the Client’s preference and the teeth present in the arch