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Fabrication of a Plint Clasp


The following shows one way to fabricate a Plint clasp used in conjunction with a Mandibular Osteotomy splint.

All photographs, text and fabrication by Mr. Andrew Tinkler at the Orthodontic / Maxillofacial Laboratory—Royal Lancaster Infirmary.

Lower and upper models after they have been articulated.

The upper model is then blocked out as shown. The space the wax occupies is where the arch wire would normally be however, it is removed whilst the impression is taken and replaced afterwards. Therefore, wax is positioned as shown to prevent the ‘arm’ / tag of the Plint clasp from bisecting the arch wire.

See above.

The Plint clasp is fabricated in 0.8mm S/S wire and to begin, (using a rubber bur) one end of the wire is ‘rounded off’ / smoothed and then the wire is bent back on itself using Adams pliers.

The second bend is made approximately one and a half centimetres along the wire and is made with ‘half round’ pliers. The wire should bend back on itself again to form a loop—similar to that made on a labial bow.

The ‘arm’ / tag is then bent towards the palate, distal to the first molar. Remember to keep the tag arm low and well formed to the interstitial area.

The wire is then bent in the direction of the premolars and canine (see next picture for reference). Retention bends are then made in the wire to ensure stability of the clasp in the acrylic.

The Plint clasp is then waxed into position by placing wax on the buccal side of the model and not on the occlusal surface.

Another Plint clasp is made on the opposite first molar (in the same arch) in the same way.

See picture for reference on the position of the retention tag.

The upper and lower teeth are waxed out in the labial, lingual , buccal and palatal areas as shown. Remembering to prevent the wax from interfering with the occlusion.

After the models have been soaked for 10 minutes, acrylic is then applied to the occlusal surface of the upper teeth, both models placed on the single hinge articulator and the articulator closed—bringing the lower model gently into the occluded final position.

It may be necessary to spray acrylic into the lingual / palatal area to ensure adequate coverage of the Plint clasps and also adequate thickness of the actual splint.

These pictures show the finished splint. Please use these pictures as a ‘trimming guide’. The acrylic is trimmed, ensuring a easy fit and polished in your usual way.

For further information contact: -

  • Mr. Andrew Tinkler. LOTA.
  • Maxillofacial Laboratory,
  • Royal Lancaster Infirmary,
  • Lancaster.
  • LA1 4RP.

Peer assessed by: -

  • Mr. Ed. Payne LOTA
  • Chief Instructor,~Orthodontic Laboratory,
  • Eastman Dental Institute for Oral Health Care Sciences,
  • University of London ,
  • 256 Gray’s Inn Road,
  • London .
  • WC1X 8LD.