1 - A rough / Chalky surface of the cast is due to_______________?
1 - A rough / Chalky surface of the cast is due to_______________?
All of the above
2 - Accelerators and retarders are used with gypsum products mainly to control_______________?
2 - Accelerators and retarders are used with gypsum products mainly to control_______________?
Setting time
3 - ADA specification number of gypsum products are described under____________?
3 - ADA specification number of gypsum products are described under____________?
25
4 - As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
4 - As per DNA No. 25, minimum amount of setting expansion required for type V gypsum products_______________?
0.1
5 - Balanced stone is dental stone_______________?
5 - Balanced stone is dental stone_______________?
In which accelerators or retarders have been added according to need
6 - Beta hemihydrate particles absorb______________?
6 - Beta hemihydrate particles absorb______________?
More water
7 - Die is________________?
7 - Die is________________?
Replica of single tooth
8 - Finer particle size of silica______________?
8 - Finer particle size of silica______________?
Greater the hygroscopic expansion
9 - Gillmore needle is used for_______________?
9 - Gillmore needle is used for_______________?
Evaluating the setting time of plaster of pris
10 - Green strength with reference to plaster means_____________?
10 - Green strength with reference to plaster means_____________?
The wet strength
11 - Gypsum is used for________________?
11 - Gypsum is used for________________?
Casts and Dies
12 - Gypsum product having least expansion_____________?
12 - Gypsum product having least expansion_____________?
Die stone
13 - Impression plaster containing potato starch is called______________?
13 - Impression plaster containing potato starch is called______________?
Soluble plaster
14 - In plaster of paris the setting time is primarily altered by_________________?
14 - In plaster of paris the setting time is primarily altered by_________________?
Addition of accelerators and retarders
15 - Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?
15 - Model plaster (white) used to cast study models before mixing with water, is largely composed of____________?
(CaSO4)2-½H2O
16 - Modiffiers are added to gypsum mainly to_______________?
16 - Modiffiers are added to gypsum mainly to_______________?
Modify setting time
17 - Most commonly used retarder in gypsum_____________?
17 - Most commonly used retarder in gypsum_____________?
Citrales
18 - Placing cast under tap water is to be avoided as______________?
18 - Placing cast under tap water is to be avoided as______________?
Gypsum is slightly soluble in water and the surface of the cast will be eroded
19 - Plaster mix____________?
19 - Plaster mix____________?
All of the above
20 - Plaster of paris _____________?
20 - Plaster of paris _____________?
Has porous and irregular crystals
21 - Plaster of paris is mixed in________________?
21 - Plaster of paris is mixed in________________?
Rubber bowl
22 - Powders of dental plaster and dental stone differ mainly in____________?
22 - Powders of dental plaster and dental stone differ mainly in____________?
Particle porosity
23 - Setting of POP is result of______________?
23 - Setting of POP is result of______________?
Difference in solubility of CaSo4 ½ H2O + CaSO4+ 2H2O
24 - The function of 2% potassium sulphate in a gypsum product is_____________?
24 - The function of 2% potassium sulphate in a gypsum product is_____________?
Regulate setting time
25 - The hygroscopic technique is associated with______________?
25 - The hygroscopic technique is associated with______________?
Investment
26 - The main difference between dental stone and dental plaster is______________?
26 - The main difference between dental stone and dental plaster is______________?
Sharpe and size of particles
27 - The main ingredient in dental plaster in_______________?
27 - The main ingredient in dental plaster in_______________?
Calcium sulphate hemihydrate
28 - The most commonly used accelerator in gypsum product is___________________?
28 - The most commonly used accelerator in gypsum product is___________________?
Potassium sulfate
29 - 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_______________?
29 - 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_______________?
Alpha – hemihydrates
30 - The setting expansion of gypsum products can be reduced by________________?
30 - The setting expansion of gypsum products can be reduced by________________?
Adding potassium sulfate
31 - The strength of gypsum prouducts is generally expressed in terms of______________?
31 - The strength of gypsum prouducts is generally expressed in terms of______________?
compressive strength
32 - 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____________?
32 - 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____________?
Green strength
33 - The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
33 - The β (Beta) hemihydrate of gypsum requires more water to float its powder particles because______________?
They are more irregular in shape and porous
34 - Type I gypsum product is also called_______________?
34 - Type I gypsum product is also called_______________?
Impression plaster
35 - Type III Dental gypsum is__________________?
35 - Type III Dental gypsum is__________________?
Class I stone or hydrocal
36 - Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?
36 - Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________?
18.6ml
37 - Water powder ratio of dental stone and plaster is respectively_________________?
37 - Water powder ratio of dental stone and plaster is respectively_________________?
0.28 and 0.6
38 - Which is gypsum product_______________?
38 - Which is gypsum product_______________?
All of the above
39 - White gold alloy predominantly is______________?
39 - White gold alloy predominantly is______________?
Gold added with palladium
Pages
No comments:
Post a Comment
Your Valued Comments Help us to improve our site. Thanks