DENTAL MATERIALS

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STRENGTH:

The wet strength (green strength) is the strength obtained when the water in excess of that required for hydration of the hemihydrates is left in the test specimen.

 

When the excess water in the specimen has been driven off by drying the strength obtained is the dry strength.

 

Dry strength 2 times – of wet strength.

  • Wet strength = 9.6 MPa (2Hrs)
  • Dry Strength          = 23.3 MPa. (3 days)

 

Max. Solubility in water – HEMIHYDRATE.

Least Solubility in water –  DIHYDRATE.

Hemi > Anhydrate > Die ← Solubility

(max.)                        (min.)

Hemihydrate 4 times – soluble than Dihydrate.

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