This document provides instructions for fabricating custom impression trays using either light cure resin or tray resin. It describes how to mark the depth and extension lines on dental casts, block out undercut areas, adapt the resin materials to the casts, trim excess material, and finish the trays. Completed trays should have rounded, smooth edges of proper thickness and extension, as well as handles of specified dimensions.

6. Mandibular Cast When the wax blockout is complete soak the cast in water for 5 minutes. Then coat the surface of the cast with a tin foil substitute.

7. Making the Tray – Light Cure Resin The tray material is adapted to the cast and the excess is trimmed away with a knife.

8. Making the Tray – Light Cure Resin The resin is cured and the edges of the trays are smoothed with an acrylic burr.

9. Making the Tray – Light Cure Resin Completed impression trays.

10. Mix approximately ¼ cup of tray resin for each tray and apply a thin layer of vaseline to your fingers. Making the Tray – Tray Resin

11. Wait for the material to get to a doughy consistency before you apply it to the template. Press material with a glass slab to obtain the proper thickness. Making the Tray – Tray Resin

12. Adapt the resin material to the cast as shown. Trim excess with a knife. Making the Tray

14. Tray periphery should be 2 -3 mm thick. The edges should be rounded. The rest of the tray should be about 1-2 mm in thickness. Tray handle - 10mm high Completed Maxillary Tray Check List

15. Tray handle should be 15mm wide and extend straight down from the alveolar ridge. Completed Maxillary Tray Check List The completed tray is smooth and of the proper dimension and extension.

16. Finger rests Mandibular Tray Finger rests aid in holding the tray in position when making the wash impression. Without finger rests it is likely that the wash material will be forced back into the vestibule distorting this portion of the impression.