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29.preparing dentures for delivery


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29.preparing dentures for delivery

  1. 1. 29 Preparing Dentures for Delivery This program of instruction is protected by copyright ©. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission.
  2. 2. 19. Preparing Dentures for Delivery a. Fabrication of facebow transfer jig b. Finish and polish c. Fabrication of clinical remount casts *Described in this section
  3. 3. 19. Preparing Dentures for Delivery a. Fabrication of facebow transfer jig b. Finish and polish c. Fabrication of clinical remount casts *Described in this section
  4. 4. Preparing Dentures for Delivery  Fabrication of face bow remount jig  Removing Processed Dentures from Master Casts  Finishing Polishing Dentures  Fabrication of clinical remount casts  Mount the maxillary remount cast on the articulator preserving the facebow transfer record
  5. 5. Fabricate Facebow Remount Jig*  Attach processed upper denture with its mounting to the upper member of the articulator and attach a mounting ring to the lower member of the articulator.  Fabricate facebow transfer jig as shown. Note that only the occlusal and incisal surfaces of the denture teeth engage the remount jig. Confine the plaster with a paper cup from which the bottom has been removed.  Smooth the surfaces of the remount jig because it will be used in the presence of the patient.*The pupose of this jig is to preserve the face bow mounting record.
  6. 6. Removing Dentures from Casts and Polishing Instruments and Materials  Plaster knife  Acrylic Burs  Pumice  Rag polishing wheels  Felt cones  Brush wheels  Kingsly scraper
  7. 7. Removing Dentures from the Master Casts  Make cuts into the base of each cast almost to the resin.  Insert the plaster knife into the cuts and carefully separate the sections of stone.  On the right a vibrating air hammer is being used to separate the denture from the cast.  Remove all stone from dentures. The Kingsley scraper is particularly useful in removing tenacious elements.
  8. 8. Finishing and Polishing  Finish borders with an acrylic bur. Remove excess resin beyond the land. Be careful to preserve the border width and contour.  Remove all plaster or stone.  Smooth the denture bases to the proper contour with your acrylic burrs.  Bubbles and other irregularities around the denture teeth can be removed with chisels or scrapers.
  9. 9. Finishing and Polishing• Remove small particles of stone from the proximal areas with a brush wheel.• The palatal portion should 1-2 mm thick.
  10. 10. Finishing and Polishing Check the bearing surfaces of the dentures for bubbles and sharp
  11. 11. Finishing and Polishing Use a very wet rag wheel with liberal amounts of wet pumice to polish the palatal, lingual, labial and buccal areas. The periphery of the denture must also be carefully polished. Use the edge of the wheel as shown during polishing to avoid burning the acrylic resin. Do not overpolish and thereby loose the contours that were developed during festooning.
  12. 12. Finishing and PolishingPolished denturesNote that the borders are rounded and smooth, and the palate is highly polished and the proper thickness Be careful not to overpolish the occlusal or incisal surfaces of the denture teeth.Do not over polish
  13. 13. Finishing and Polishing Reexamine the tissue side of the dentures and carefully remove any bubbles present with a Kingsley scraper or other sharp instrument. •Prior to delivery the dentures must be soaked in water for 72 hours.
  14. 14. Fabrication of Remount CastsPurpose: Provide casts with which to mount the clinical remount record
  15. 15. Remount CastsBegin by blocking out the undercutsassociated with the undersurface of thedentures with moistened pumice.
  16. 16. Remount Casts Mix a small amount of impression plaster, place it on the lab bench and imbed the denture into it as shown.
  17. 17. Remount Casts The remountAfter the casts will beplaster has used to mountset, removethe dentures the clinicalfrom the cast, remount recordsand trim them on theas shown. articulator.
  18. 18. You are now ready to perform the clinical remount procedure The maxillaryremount cast hasbeen connected to theupper member of thearticulator by meansof the facebowtransfer jig. With thelower remount castyou are now ready toperform the clinicalremount procedure.