When making a polysulphide impression for a caste crown, custom trays are usually preferred over stock trays for all of the following reasons except_______________?

Impression Materials 25/10/2021

A. Custom trays facilitate uniform contraction of impression material
B. Custom trays require less impression material
C. Stock trays may be short in the flange area
D. Impressions made n the custom trays are easier to remove from the mouth

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    A. increasing the working time of alginate impression material B. Acts as an accelerator C. Initiating the setting reaction D. Provides gel strength...
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    Rough and irregular surface produced on the impression is because of ?
    A. Improper application of pressure during impression making B. Air incorporated during mixing C. Too rapid polymerization D. Presence of moisture in impression area...
    Which one of the following increase the strength and reduce viscosity of agar hydrocolloid impression material_____________?
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