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Dental Materials

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

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

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

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

Dental Materials, Impression Materials, Medical Mcqs

Which of the following is true about Agar hydrocolloid impression material ?

Which of the following is true about Agar hydrocolloid impression material ?

A. Liquefies between 71 – 100°C
B. Solidfies between 50 – 70°C
C. Facilitates fabrication of metal dyes
D. Cannot register fine surface details

Which of the following is true about Agar hydrocolloid impression material ? Read More »

Dental Materials, Impression Materials, Medical Mcqs