MCQs of Dental Materials – Gypsum Products

Model plaster (white) used to cast study models before mixing with water, is largely composed of:

The product, which is obtained by calcining gypsum under steam pressure at 120-130°C or by dehydrating gypsum in the presence of sodium succinate is:

Water powder ratio of dental stone and plaster is respectively

Type III Dental gypsum is:

Green strength with reference to plaster means

Beta hemihydrate particles absorb

Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate

Powders of dental plaster and dental stone differ mainly in:

Plaster of paris is mixed in:

Impression plaster containing potato starch is called:

Die is:

Balanced stone is dental stone

The main ingredient in dental plaster in:

The strength of the gypsum specimen when the water in excess of that required for the hydrate of the hemihydrate is left in the specimen is called?

Accelerators and retarders are used with gypsum products mainly to control

Gypsum is used for?

The hygroscopic technique is associated with:

The main difference between dental stone and dental plaster is:

The most commonly used accelerator in gypsum product is:

As per DNA No. 25, minimum amount of setting expansion required for type V gypsum productis

Which is gypsum product?

Plaster of paris:

In plaster of paris the setting time is primarily altered by:

Type I gypsum product is also called:

The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because:

Setting of POP is result of:

Placing cast under tap water is to be avoided as:

Gillmore needle is used for

2 % solution of borax is used as surface hardening agent for:

Gypsum product having least expansion:

Modiffiers are added to gypsum mainly to:

Most commonly used retarder in gypsum:

ADA specification number of gypsum products are described under

The setting expansion of gypsum products can be reduced by:

Finer particle size of silica:

A rough / Chalky surface of the cast is due to:

The function of 2% potassium sulphate in a gypsum product is:

Plaster mix:

The strength of gypsum prouducts is generally expressed in terms of: