1. Stock impression tray and construction of diagnostic cast
DSP331
Presented By:
Dr. Tushar Bhagat, MDS.

2. Content… A. Definition of trays B. Types of impression trays
C. Requirements of an ideal impression tray
D. Stock impression trays (classification and modification)
E. Preliminary impressions
1. Definition
2. Materials used for
3. Pouring the preliminary impressions (double‐pour technique)
4. Trimming of diagnostic casts
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

3. Definition of dental impression…
Dental impression is a negative replica or imprint of the teeth and adjacent tissues for use in dentistry.
Impression Material is a substance used for making a negative replica for the required tissues.
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

4. Definition of tray…
Device used to carry the impression material to the mouth, confine the material in apposition to the surfaces to be recorded and control the impression material while it sets .
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

5. Types of impression tray…
Stock Trays (Various Size & Made By Manufactures)
Custom (Individual Or Special) Trays Made For One Patient And Discarded Later
Stock Trays
Custom Tray
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

6. Requirements of ideal impression tray…
Rigid
Retain Shape
Easily To Be Trimmed And Modified
Smooth Edges
Control Material During Seating, Set &Removal
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

7. Stock impression tray…
Metal trays are made of Aluminum or stainless steel
Non metallic trays are made of;
Plastic (disposable)
Plastic can be sterilized (xantalgin trays)
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

8. Stock impression tray…
According to the nature of impression materials
Plain tray
Perforated tray
Rim lock tray
Water cooled tray
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

9. Preliminary impression…
Preliminary impression is an impression made for the purpose of diagnosis and construction of custom tray.
Preliminary (Primary or diagnostic) cast
Positive replica of the upper or lower jaw tissues that is made in an impression and over which custom trays may be made
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

10. Preliminary impression material…
1. Alginate (irreversible hydrocolloid) and may be used for
Some cases of RPD
Some cases of FPD
Alginate impression should be poured immediately
2. Modeling compound
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

11. Pouring the preliminary impression…
Dense mix of plaster
Avoid air entrapment
The plaster should capture the contour of labial and buccal border
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

12. Diagnostic cast…
Diagnostic cast is define as a positive reproduction of the upper or lower jaw tissues that is made in an impression and over which impression trays may be made.
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

13. Uses of diagnostic cast…
Detection of ridge relationship and inter ridge distance
To evaluate the size and contour of the arch
To detect areas need to be relieved
To construct a custom tray
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

14. Triming of diagnostic cast…
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar

15. Thank you…
Stock impression tray and construction of diagnostic cast. By:Dr.Tushar