Elements and Performance Criteria
- Plan treatment
- Make accessible in the clean zone of the surgery the client's required laboratory work and necessary charts andrecords
- Obtain accurate, complete and legal records of the client's personal, medical and dental history
- Interpret prescription where required
- Provide full details of the procedure to the client and/or carer
- Obtain and document consent following ethical and legal requirements
- Implement standard precaution during all procedures
- Ensure emergency procedures are in place and ready for use according to relevant guidelines
- Take a primary impression
- Select correctly the equipment, instruments and materials for the primary impression
- Take primary impressions of the maxilla and/or mandible using an alginate material in stock edentulous trays
- Relieve the denture in the area of the abutments
- Reline the denture with a tissue conditioning material
- Pour alginate impression in dental stone and trim for custom tray fabrication
- Prepare to take a final impression
- Fabricate an open window custom tray to provide an accurate impression of tissue details and the relationship of the abutments to one another and to surrounding oral tissues
- Ensure abutment screw tightness
- Attach impression copings to the abutments with the proper length guide pins
- Try-in the custom tray in the mouth and check for comfort and path of insertion
- Mould the borders of the custom tray
- Seal the window with baseplate wax and soften in a heated water bath
- Insert custom tray over the guide pins and impression copings
- Take the final impression
- Paint the custom tray with an appropriate adhesive for the impression material to be used
- Mix the selected impression material according to the manufacturer's specifications
- Load the impression material into the tray and syringe and inject around the impression copings
- Seat the impression tray using the guide pins and holes in the wax window as a guide for placement
- Complete moulding of the borders
- Clear excess impression material from guide pins before complete setting
- Loosen the guide pins and remove the impression
- Pour master cast and fabricate occlusal rims
- Screw replicas onto the impression copings with guide pins
- Bead and box the final impression and cast in diestone
- Unscrew each guide pin completely before separating the impression from the cast
- Fabricate attachment and bar extensions according to the prescription
- Evaluate casting for accuracy of fit on the abutments
- Fabricate a customized record base incorporating attachments
- Add occlusal rims to the trimmed and polished base
- Establish maxillomandibular relations
- Position the attachment bar in the mouth
- Place pressure indicator paste on the fitting surface of the base and ensure the base is fully seated in the mouth
- Check the base for attachment retention and potential pressure areas
- Record maxillomandibular relationships
- Establish lip support and phonetics at the correct vertical dimension
- Select tooth shade and denture tooth mould
- Try-in of waxed denture in client's mouth and process
- Insert the completed overdenture