Instructions to construct a VERSACRYL Gasket Clasp


A VERSACRYL gasket clasp around upper right molar, incorporated into the denture

 

Each VERSACRYL Laboratory kit contains:

  • VERSACRYL Softener monomer
  • VERSACRYL Hardener monomer
  • VERSACRYL powder polymer

To obtain the best results, layer 3 rings from soft to hard around the abutment tooth.

  1. In 3 small jars, first mix Softener and Hardener and stir for 10 seconds. The recommended proportions for the 3 gasket rings are, from soft to harder: 80% Softener to 20% Hardener, 50 % A to 50% B and 20% A to 80% B. In the instructions, the ratios are expressed in 'drops' of each liquid.

  2. For each rigidity, just before using, slowly add the VERSACRYL powder while stirring, until the consistency is light creamy (approx. 1.5 parts powder to 1 part liquid). Wait until the mixture can be rolled into a wormlike shape.

  3. Two methods to construct a VERSACRYL gasket clasp:
  • Double-pack heat-cure into a new denture: flask, remove wax and pack denture with pink acrylic using a polyvinyl sheet. Press and re-open flask. Cut away a circular area, around the abutment tooth, creating a void of at least 3 mm in width. Pack the softest VERSACRYL mixture directly into the undercuts; then with the slightly harder mixture, lay a ring right around the tooth and finally with the hard mixture, link the clasp to the pink denture base. Close flask, final press and process as usual.

  • Self-cure onto a new or existing denture: cut back and prepare the surfaces by roughening and priming with Hardener using a brush. Apply the softest VERSACRYL mixture directly into the undercuts; then with the slightly harder mixture, lay a ring right around the tooth and finally with the hard mixture, link the clasp to the pink denture base. Process as usual in a pressure cooker.

Note: when finishing a gasket clasp, always make sure to relieve the tissue area around the abutment tooth, with a large round burr, from the inside of the partial denture. Also, carefully check and adjust the final amount of retention on a duplicate model using warm water (not hot!) to ensure the appliance can be removed without too much resistance.


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