Stock impression tray and construction of diagnostic cast DSP331 Presented By: Dr. Tushar Bhagat, MDS. 7508tvb@gmail.com

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

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

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

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

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

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

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

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

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

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

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

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

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

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