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NEET MDS Shorts

18673
Dental Materials

Resin teeth are more ductile than porcelain teeth, which means they can absorb and distribute forces better, making them less prone to chipping or fracturing on impact.

51007
Dental Materials

Higher temperatures generally speed up the chemical reactions involved in the setting of gypsum products, leading to a shorter setting time.

52999
Dental Materials

Dental stone typically has a lower water to powder ratio compared to other gypsum products, which gives it higher strength and durability suitable for making dental models.

22600
Dental Materials

Die stone has great strength and hardness

26745
Dental Materials

Heat-activated denture resins typically have a Charpy impact strength range of 0.98 to 1.27 joules, which is higher than that of chemically activated resins.

97928
Dental Materials

Zinc polycarboxylate cement is a water-based cement.

98253
Dental Materials

Ormocers have several advantages, including low shrinkage, excellent biocompatibility, and superior resistance to masticatory forces. These properties make them suitable for restorations that resemble natural teeth.

35960
Dental Materials

The elastic range of a wire is the amount of deflection it can withstand before permanent deformation occurs. It is the difference between the elastic limit and the ultimate tensile strength.

12902
Dental Materials

Knoop hardness test - Diamond of rhombic shape (The long axis of indentotion is measured)
Vickers (Diamond pyramid test) - Diamond of square base shape (The diagonal length of the indentation is measured)
Rockwell  - Diamond of conical shape (The penetration depth is measured)
Brinells  - Steel ball (The diameter of indentation is measured)

The Knoop hardness test is used to obtain the values for both exceedingly hard and soft materials. The
hardness value is independent of the ductility of the material.

93413
Dental Materials

The elastic range of a wire determines the extent to which it can be deflected and still return to its original shape without permanent deformation. A wire with a high elastic range can be activated to a greater extent before it reaches its plastic range, making it suitable for larger tooth movements.

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