Stock trays

1. Stock trays By Amin Abusallamah

2. Impression tray It is a device used to carry & control impression material while making an impression stock tray The tray we use in the primary impression

3. Parts of the tray handle flanges floor

4. The tray should be rigid and strong but not too thick . The tray should simulate the finished denture in size and shape. The border extension of the tray should be 2mm short of the vestibular depth with no interference with muscle or frenal attachment. Requirements Of Impression Trays

5. Cont… 4. The entire borders of the tray should be smooth and rounded. 5. The tray should retain its shape throughout the impression procedure and pouring of impression. 6. The handle of the tray should be angulated.

6. Types o f stock trays Metallic it can be aluminum or stainless steel. Non metallic: Plastic tray which can be sterilized. Disposable plastic trays.

7. Cont… Square ( dentulous patient ) oval or rounded (edentulous patient )

8. 1 . Perforated trays (used with alginate) 2. Non perforated or plain trays (used with impression compound ) Mode of stock trays

9. Cont… 3. Sizes : small, medium, large and extra large

10. Adhesives & Perforations t is essential that impression materials adhere firmly to the impression trays. This can be achieved by either perforations or by the use of adhesives. Adhesive solutions are needed for alginates, polysulphides and silicones. Adhesives for alginates are solutions of resins in alcohol, they are supplied in a bottle with a brush or an aerosol spray. Tray adhesive being applied to a metal stock tray for an alginate impression

11. Thank you … For listening