Gypsum products part -1

A detailed explanation of gypsum products, which helps the students in better learning and understanding.
important in exam point of view

1. Gypsum products part - 1 Dr.shiva

2. Introduction

3. History

4. Why its called as plaster of paris? Montematre - place in paris where the large scale of plaster is manufactured

5. GYPSUM THAT AVAILABLE IN NATURAL / RAW FORM

6. Hydrated dehydrated Rehydrated Dehydrate but little amount of water

7. CALCIUM SULFATE DIHYDRATE

8. MANUFACTURING OF GYPSUM

9. Gypsum after manufacturing (powder form)

10. Hydrated(dihydrate) Dehydrated(hemihydrate) Rehydrated Dihydrate(dehydration)

11. How does different material like dental stone and dental plaster….. are formed??

12. With out water With water and by closing it with lid With some stuff and closing it with lid With some other stuff and closing it with lid

13. Open kettle Closed kettle

14. GYPSUM PRODUCTS – ADA 25 Gypsum products are the results of partial dehydration of gypsum, which produces calcium sulfate hemihydrate (CaSO4.1/2 H2O).

15. CLASSIFICATION OF GYPSUM PRODUCTS

16. Loss of glossy test or glass disappearance. As the reaction proceeds some of the excess water is taken up in forming dihydrate by capillary action so that the mix loses its gloss. When loss of glass occurs further manipulation of gypsum mass should be avoided

17. Difference between indentation and penetration

18. Vicat penetrometer

19. The rod is lowered until it contacts the surface of the material and then the needle is released and allows penetrating the mix. When the needle fails to penetrate to the bottom of the container the material has reached Vicat setting time. Initial setting time is defined as the time from the beginning of the mixing until the Vicat needle no longer penetrates the entire depth (5 cm) of a given mass of material.

20. Indentation test

21. Mind mapping

22. Thank you Drshivasai