1. 8. Boxing Impressions and Making Casts John Beumer III, DDS, MS and Robert Duell, DDS Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry UCLA School of Dentistry 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.

5. Boxing - Beading and Boxing with Wax 1) Apply a layer of sticky wax around the the impression 3 mm below the periphery as shown. Maxillary impression

6. Boxing – Beading and Boxing with Wax 2) Apply and seal rods of beading wax to the sticky wax on the impression to form the land.

7. Boxing – Beading and Boxing with Wax 3) Wrap a sheet of red boxing wax around the beading wax to form a container. All joints must be sealed with hot wax to prevent stone from leaking through.

10. Prepare a dense mix of yellow stone using your vacuum mixer and vibrate the stone into the boxed impression. Be careful to avoid entrapment of air bubbles. Pouring the Cast

14. The same result can be achieved by boxing the entire impression with a mixture of plaster and pumice (to form the land area) and boxing wax to create the enclosure. If you use this method be sure to coat the plaster pumice mixture with vaseline before you pour stone into impression so that cast will separate from this mixture. Boxing the Impression

17. After heating the compound in a water bath, carefully separate the cast from the impression Retrieving the Cast

19. Trim master casts. The base should be no thicker than 15-20 mm. If the base is too thick the cast will not fit within the confines of the denture flask. The land of the cast must be at the same level as the edge of the lower member of the flask. Trimming the Master Cast

20. Completed Master Cast Land (4-6mm thick) Base (15-20 mm thick) Depth of peripheral roll (2-3 mm)

21. The base for this cast was insufficient and eventually it fractured necessitating remaking of the impression Trimming the Master Cast

22. Master Casts These casts have been properly trimmed and marked. Place rounded notches (arrows) on the bottom of the master cast. These notches will later be used to remount the processed denture back onto the articulator. The notches should be placed on the back and on the sides of the casts.

23. Anterior land Cast Landmarks - Maxilla Midline Incisive papilla

24. Lines indicating the crest of the ridge Cast Landmarks -Mandible Midpoint of retromolar pad Land Mark on land indicating the midpoint of the retromolar pad