32 SERIES ( VIDEO NO 47)

have ribbon this is dr. aamil from Team MDS conquer in this video we are going to discuss 32 important points from the topic of dental materials point number 1 compressive stress it is the internal resistance to a loop that tends to compress or shorten embody number 2 tensile stress it is the internal resistance to a load that tends to stretch or elongated body number 3 is shear stress it is the resistance to the sliding motion of a body over another by twisting it or shun load number 4 the material used for Knoop hardness tested diamond of rhombic shape here the long axis of indentation is measured the hardness value is independent of the ductility of material number 5 the material used for vickers test that is the diamond pyramid test is a diamond of square base shape even in this the diagonal length of indentation is measured number 6 the material used for rockwell test is diam end of conical shape in this the penetration depth is measured number 7 the material used for brenell's to steel ball in this the diameter of indentation is measured number 8 Brunell and rockwell tests are classified as toe hardness test and they are not suitable for brittle materials number nine the nope and Vickers gist are classified as micro hardness test both of this tests employ loads less than 9.8 Newtons pond number 10 the shore and bark coal tests are used for measuring the hardness of rubbers and plastics member 11 the Brinell test is one of the oldest is used for determining the hardness of materials and it is directly related to proportional limit and the ultimate tensile strength of dental gold alloys number 12 in the stress-strain graph the slope of straight line is up to the proportional limit represents modulus of elasticity number 13 in this graph the area below the modulus within the elastic range is known as resilience and the area under the entire length of the line up to the fracture strength represents toughness number 15 the ultimate tensile strength is the stress at the point of fracture it is also known as breaking point number 16 the contact angle is the angle formed by the adisyl within the other end at their interface the less the contact angle the more the wettability and spreadable number 17 ductility is the ability of a metal to be drawn into a wire under tensile load without rupture this duct-taping can be measured by percent elongation and cold blend test number 18 gold is the most jock tale and malleable pure metal and silver is second platinum ranks third in ductility and copper ranks third in malleability number 19 coefficient of thermal expansion of tooth enamel is closest to type two GLC followed by silicates number 20 Newtonian fluid it is known as ideal liquid as the shear stress is proportional to this strain step number 21 dilute and liquid in this the viscosity of liquid increases with increase of shear stress number 22 thixotropic fluid in this the viscosity of fluid decreases under pressure number 23 pseudo plus tooth here the viscosity decreases with increase in shear stress until they reach a constant value number 24 viscoelastic it is a characteristic of polymers the behave as elastic solids or Springs and as a viscous liquids number 25 might sinem flexibility it is defined as the flexural strain that occurs when the material is stressed to its proportional limit remember 26 one of the most commonly used method to define and measure color quantitatively x' moon cell system in this system the parameters of color are represented in three dimensions number 27 the two different testing techniques use it to determine tensile strength our direct tensile strength and diametral compression strength number 28 brazilian cylinder splitting test is the type of diametral compression test and it is widely used test to determine the ultimate tensile strength of brittle materials number 29 eutectic alloy is an alloy for which the component metals have limited solid solubility number 30 peritectic alloy it is the addition to eutectic system here the limited solid solubility of two metals can result in peritectic transformation number 31 energy required to liquefy is known as latent heat of fusion number 32 the brightness becomes more intense color appears to change this phenomenon is known as basalt Brooke effect that's it for today's session guys keep on reversing this points all the best thank you

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