Mrs J H Brahmbhatt - Page 1 of 1 -

BOXING UP MASTER IMPRESSIONS (Completes or Partials Dentures)

1. Disinfect the the master casts. Discard gloves worn in the clinic. 2. Remove the impression from the bag and wash it under water. 3. Dry the impressions and make a 2mm line on the outside of the impression

from the deepest part of the sulcus. 4. Cut interdentally if the impression is of a partially dentate individual. When

you cut you must cut more buccal so that the lingual or palatal surface is intact

5. Put a wet tissue inside the impression if there are teeth present. The reason why you do this is so that when you are waxing up, the wax does not dribble inside the teeth.

6. Take sticky wax and put it on the line. Make sure that you do not drag the wax. Do a small area at a time.

7. Take ribbon wax and put it on the sticky wax, it should be put at ninety degrees to the sticky wax. Do not try to seal to the sticky wax. Just try and hold in position, and put the ribbon wax all the way round the impression. Turn the impression over and seal on this side with pink wax.

8. If it is the lower impression, the take pink wax and cut it in half. Warm the wax and make triangle and place it the lingual area, turn the impression over and press the wax down in the middle so that it is touching the metal tray. When you look at the impression from the back it should like the U shape. Cut the excess off so that the ribbon and the pink wax are in line. Add another ribbon wax all the way round. (Only on the lower).

9. To box the upper we use red broad wax. Make a small ledge on the red broad wax and place it under the ribbon wax (the impression facing you) all the way round then turn it over and seal it with pink wax. Do the water test

10. To box the lower we need to use the pink wax as the heels are higher then the anterior area. We need to use one and half sheet of wax. We need three quarter width of the whole sheet. The half sheets cut it in half and join it together.

11. Now heat the edge of the wider piece of wax and place it form 6-6 on the heels. In the front put the other piece of the wax. Turn over and seal to the ribbon wax with pink wax. Make sure both the boxed impressions are water tight.

12. Fill the impressions with water and then add teapole to it. Shake it and then rinse under water a couple of times as you have to make sure that no trace of soap is left in the impression.

13. If the impression is for completes then they should be poured in yellow stone mixed in rubber bowls. If the impressions are partially dentate they should be poured in Fuji rock as it is the harder stone, and left for 24 hours

14. Once set remove as much wax as possible. Then soak in cold water for 5-10 minutes and then boil the master casts. For the complete dentures take the trays off. But for partial dentures you might have to burn the trays.

15. Trim the cast and they are ready to work on.