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
4. 1. The tray should be rigid and strong but not
too thick.
2. The tray should simulate the finished denture
in size and shape.
3. 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 of stock trays
A. Metallic it can be aluminum or stainless steel.
B. Non metallic:
1. Plastic tray which can be sterilized.
2. Disposable plastic trays.
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
