front 1 What are Elastomeric Materials classified to? | back 1
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front 2 When was condensation silicones discovered? | back 2 1955 |
front 3 What was the first silicon impressions found? | back 3 Condensation silicones |
front 4 What is the alternative name for condensation silicones? | back 4 Conventional silicone |
front 5 What is condensation silicon mainley used for? | back 5 For fixed partial dentures |
front 6 What is the mixing time for condensation silicon? | back 6 45sec |
front 7 What is the mixing time for addition silicon? | back 7 45sec |
front 8 What is the mixing time for polyether? | back 8 30sec |
front 9 What is the working time for condensation silicon? | back 9 2-4min |
front 10 What is the working time for addition silicon? | back 10 2-4min |
front 11 What is the working time for polyether? | back 11 3min |
front 12 What is the setting time for condensation silicon? | back 12 6-8min |
front 13 What is the setting time for addition silicon? | back 13 4-6.5min |
front 14 What is the setting time for polyether? | back 14 6min |
front 15 What is the relationship between condensation silicon with humidity and temperature? | back 15 The setting time of condensation silicon decreases with the increase of temperature and humidity |
front 16 What is the dimensional change of condensation silicon after 24h? | back 16 0.60% |
front 17 What is the dimensional change of addition silicon after 24h? | back 17 0.15% |
front 18 What is the dimensional change of polyether after 24h? | back 18 0.24% |
front 19 How much time should you wait before you pour the condensation silicon? | back 19 It should be poured immediately |
front 20 What is the reason for the dimensional change in condensation silicon? | back 20 Because of shrinkage due to loss of ethyl alcohol |
front 21 How much is the tear strength of condensation silicon? | back 21 3000gm/cm |
front 22 How much is the tear strength of addition silicon? | back 22 3000gm/cm |
front 23 How much is the tear strength of polyether? | back 23 3000gm/cm |
front 24 How long is the shelf life for condensation silicon? | back 24 2 years |
front 25 How long is the shelf life for addition silicon? | back 25 1-2 years |
front 26 How long is the shelf life for polyether? | back 26 More than 2 years |
front 27 Name the properties of condensation silicon? | back 27 Other than the mixing time, shelf life, dimensional change and tear strength it has:
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front 28 Which one is stiffer and harder: A)condensation silicon B)polyether C)A and B are the same | back 28 Condensation silicones because its hardness increases overtime |
front 29 How do you control the viscosity of condensation silicon and polyether? | back 29 Their viscosity depends on how many inert fillers(they are materials you add that modify the viscosity of impressions but don't take part in the chemical reaction) You add |
front 30 Name the advantages of using condensation silicon? | back 30
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front 31 Name the disadvantages of using condensation silicon? | back 31
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front 32 Which one is more expensive: A)condensation silicon B)polyether C)A and B are the same | back 32 B |
front 33 When is the addition silicon made? | back 33 1975 |
front 34 Which one have better properties overall? A)condensation silicon B)polyether C)addition silicon D)they are the same | back 34 C |
front 35 What is the alternative name for Addition silicon? | back 35 Poly vinyl siloxane |
front 36 How long can addition silicon last dimensionally stable? | back 36 It can stay dimensionally stable even after 1 week |
front 37 Name the properties of addition silicon? | back 37 Other than the mixing time, shelf life, dimensional change and tear strength it has: 1-good detail reproduction 2-extremly hydrophobic 3-can be used to duplicate cast models(models that have already been used to record the patient's mouth details) 4-low flexibility 5-sulfur can cause retardation(increase) of setting time or even no polymerization(mixing between base and catalyst) 6-expensive |
front 38 How long should you wait before putting gypsum and dies on addition silicons? And why? | back 38 30mins, because they release H2 on setting |
front 39 What is the most dimensionally stable elastomeric impression material? | back 39 Addition silicones |
front 40 What is the problem with the dimensionally stability of addition silicon? | back 40 They have inadequate dimensional stability when it comes to maintain their shape during production of working cast thats why they are syringed in the place on to the tooth for accuracy |
front 41 When was polyether discovered? | back 41 1965 |
front 42 Where was polyether discovered? | back 42 In germany |
front 43 What is polyether used for generally? | back 43 For a few type of teeth impressions that doesn't have deep undercuts because of their hardness and short working time |
front 44 What are the properties of polyether? | back 44 Other than the mixing time, shelf life, dimensional change and tear strength it has:
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front 45 What are the advantages of polyether? | back 45
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front 46 What are the disadvantages of polyether? | back 46
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front 47 What were Elastomeric materials called in the first place? | back 47 Synthetic rubber or rubber impression materials |
front 48 What are elastomeric impression materials mostly used for? | back 48
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front 49 How are elastomeric impression materials generally supplied? | back 49 As two separate pastes:
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front 50 How are putty(high viscosity) elastomeric impression materials generally supplied? | back 50 In jars |
front 51 What are the general properties of Elastomeric impression materials? | back 51 Elastomeric impression materials:
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front 52 Should the mouth be dried or not before using elastomeric impression materials? | back 52 Yes the mouth should be dried bc you need good flow since elastomeric impression materials are hydrophobic |
front 53 What causes dimensional changes in elastomeric impression materials? | back 53
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front 54 What by-product in condensation silicon is lost while sitting? | back 54 Alcohol |
front 55 What by-product in polysulfide is lost while sitting? | back 55 Its volatile accelerators |
front 56 When should you pour elastomeric impression materials? | back 56 After elastic recovery but before dimensional changes are set |
front 57 What is the number one thing that determines the properties of elastomeric impression materials? | back 57 The amount of filler that is added to the pastes |
front 58 According to their viscosity, which type of elastomeric impression material is more accurate? Why? | back 58 Heavy-bodied viscosity type of elastomeric impression materials bc it has more dimensional stability due to lower thermal contraction |
front 59 What are the ways of mixing elastomeric impression materials? | back 59 By:
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front 60 How could you prepare elastomeric impression materials? | back 60
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front 61 What is the first elastomeric impression material? | back 61 Polysulfide |
front 62 When was polysulfide introduced? | back 62 1950 |
front 63 What are other names for polysulfide? | back 63 Mercaptan/ thymol |
front 64 What is the color of the Base paste of polysulfide? | back 64 White |
front 65 What is the color of the catalyst paste of polysulfide? | back 65 Grey or Brown |
front 66 How long is the working time for polysulfide? | back 66 4-7min |
front 67 How long is the setting time for polysulfide | back 67 7-10min |
front 68 How long would the polysulfide need to set if it was in colder ambient atmosphere? | back 68 It could be workable for as long as 16min |
front 69 Does water accelerates or acts as a retarder for the setting reaction of polysulfide? | back 69 It accelerates the setting of polysulfide |
front 70 What are general properties of polysulfide? | back 70
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front 71 How much is the dimensional change of polysulfide after 24h? | back 71 0.4% |
front 72 How much is the permenant deformation of polysulfide? | back 72 3-5% |
front 73 How much is the flexibility of polysulfide in percentage? | back 73 7% |
front 74 How much is the space needed for elastic recovery between polysulfide and the tray? | back 74 2mm |
front 75 How long is the shelf life for polysulfide? | back 75 2 years |
front 76 What elastomeric impression material has the highest permenant deformation? | back 76 Polysulfide |
front 77 Which one is less hydrophobic condensation silicon or polysulfide? | back 77 Polysulfide |
front 78 What are the advantages of polysulfide? | back 78
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front 79 What are the disadvantages of polysulfide? | back 79
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front 80 Do elastomeric impression materials shrink or expand with high temperature? | back 80 Expand becuase of high coefficient of thermal expansion |