front 1 Are hydrocolloids elastic or rigid? | back 1 Elastic |
front 2 How do agar solidify? | back 2 With increasing temperature |
front 3 Why do people dont use agar? | back 3 It requires expensive apparatus to work with |
front 4 What is the tray we use for agar? | back 4 Water cooled rim locked tray |
front 5 What is Agar used for mainly? | back 5 For removable dentures and bridges |
front 6 When does agad go through deformation? | back 6 It has very poor mechanical properties and goes through deformations very easily after a few minutes of being under stress |
front 7 How is the dimensional stability in agar? | back 7 It has very poor dimensional stability becuase of its water absorption and vapourizing |
front 8 Is agar reversible or irreversible? | back 8 Reversible |
front 9 Is alginate reversible or irreversible? | back 9 Irreversible |
front 10 How does alginate changes its state? | back 10 Becuase of its chemical reactions |
front 11 In what form do they provide Alginate? | back 11 Powder |
front 12 How can manufacturers change alginate? | back 12 By changing the retards added during manufacturing |
front 13 How can dentists change alginate? | back 13
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front 14 How does temperature affect setting time of alginate? | back 14 Increase of temperature decreases setting time |
front 15 Name the properties of Alginate? | back 15
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front 16 How flexible is Alginate under strees? | back 16 About 14% flexible |
front 17 If you increase the paste how will that affect flexibility? | back 17 It'll result in lesser flexibility |
front 18 How much deformation will Alginate get if its highly elastic? | back 18 1.2% |
front 19 How can you protect alginate against deformation? | back 19 By removing it from mouth quickly |
front 20 How can you solve the adhesion problem of Alginate | back 20 By either:
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front 21 How is alginate if it filled undercuts? | back 21 Its flexible enough to be withdrawn from undercuts but if the undercuts were deep it'll break becuase it can't handle too much stress |
front 22 What is the best way to store Alginate? | back 22
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front 23 How does time affect Alginate? | back 23 Alginates become stronger if you remove it after a few minutes after it was set |
front 24 What is Syneresis? | back 24 Losing water(maybe by vapourising) |
front 25 What is imbibition? | back 25 Absorbing water |
front 26 How long should you store Alginate for? | back 26 Maximum 1h |
front 27 What are the uses for Alginate? | back 27
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front 28 What is the advantages of Alginate? | back 28
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front 29 What are the disadvantages for Alginate? | back 29
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front 30 Describe the defects of Alginate? | back 30 1-Defects: 2- Tearing: 3-External bubbles: 4-- Irregularly shaped voids: moisture or debris 5- Rough or chalky stone model: inadequate cleaning of the impression excess water left in impression Premature removal of model. 6- Distortion: impression not poured immediately Movement of tray during setting. Removal from mouth too early Improper removal from mouth |