gypsum products -dental materials

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GYPSUM PRODUCTS  
DENTAL MATERIALS

 Gypsum was found in mines around city of Paris so its called plaster of Paris.

  • ADA SPECIFICATION NUMBER: 25
  • Gypsum is classified into 5 types :
  • Type1: Dental plaster for impression
  • Type2: Dental plaster ,class 1- mounting,class 2-for moulds
  • Type3: Dental stone for model
  • Type4: Dental stone -high strength and low expansion
  • Type5: Dental stone - high strength and high expansion 




  • 1 MOLE=  6.02214076×1023.
  • Gaughing water: Excess water mixed with plaster ,makes manipulation quite easier .

  • mechanism of setting in gypsum is explained through 3 theories out of which dissolution precipitation theory is widely accepted.
                                  
  • Advantage:
  • 1)record fine details with least pressure
  • 2)dimensional changes very minimal 
  • 3) economical
  • Disadvantage:
  • 1)gag reflex
  • 2)cannot be used in undercut regions 
Thanks for reading kindly comment down ur suggestion below 

Comments

  1. STENCIL DENTJuly 21, 2021 at 2:08 PM

    Sure 👍🏻

    ReplyDelete
  2. UnknownFebruary 25, 2022 at 3:41 PM

    I have joined 1st year bds in srm dental . Thank you for your notes.
    Do u have any question paper for 1st year??

    ReplyDelete
    Replies
    1. STENCIL DENTFebruary 25, 2022 at 7:10 PM

      Hi ,that’s great to hear no dear I don’t have any srm college question paper but I do have my friends studying there do get in touch through my Instagram account.

      Delete

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