ZINC POLYCARBOXYLATE CEMENT -FREQUENTLY ASKED VIVA QUESTIONS WITH ANSWERS

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         ZINC POLYCARBOXYLATE  CEMENT 

INTRODUCTION:

  • Zinc polycarboxylate cement s also known as zinc polyalkalonic acid or zinc polyacrylate .
  • Zinc polycarboxylate cement has good thermal insulation property 
  • ADA SPECIFICATION NUMBER for zinc polycarboxylate cement is 96
  • It can be used as cavity liner or base for amalgam restoration where cavity with remaining dentin thickness greater than 0.5mm.

1)COMPOSITION:

POWDER - ZINC OXIDE  (90%),MAGNESIUM OXIDE (10%) STANNIC OXIDE may be substituted in the place of magnesium oxide ,BISMUTH OXIDE ,ALUMINUM OXIDE .

LIQUID - Polyacrylic acid, Itaconic acid and other un saturated tricarboxylic acid  

2)POWDER /LIQUID RATIO :

  • Restorative purpose : 1:1
  • Luting purpose :1:2

3)SETTING REACTION :

  • Surface dissolution of powder by acid releasing ,binds to polymer chain via carboxyl group further react to carboxylic group of adjacent polyacid chain .

4)SETTING REACTION TIME :6-9 MINUTES

5)WORKING TIME :2.5 MINUTES 

6)MANIPULATION :

  • Powder /liquid is dispersed in a glass slab ,powder rapidly gets incorporated in large quantities .

7)APPLICATION OF ZINC POLYCARBOXYLATE CEMENT :

  • LUTING 
  • Cementation of stainless steel crown 
  • Restoration of decayed tooth 

8)BIOLOGICAL PROPERTY :

  • Less pulpal retention due to increased particle size of cement particle than the diameter of dentinal tubule .





9)BOND FORMATION :

  • Zinc polycarboxylate cement bond through ionic bond as polycarboxylate group react with calcium present in enamel and dentin ,bond strength more to enamel when compared to dentin .

10)TYPE OF CEMENT REACTION :

ACID-BASE type of reaction 

11)MECHANICAL PROPERTIES :

COMPRESSIVE STRENGTH :55MPA

TENSILE STRENGTH: 6.2MPA

ELASTIC MODULUS :5.1GPA

PULP RESPONSE :MILD

pH:1.6 ( LESS ACIDIC THAN ZINC PHOSPHATE)

TIME TO PROCEED :3-6





CONCLUSION :

Hello vanakam my dear stencildent family members!!! happy to be sharing one of your dear subscribers request to post all dental cements notes soon so ,here you go with amazing series of posts, YES its been really long since I have posted .Probably  was waiting for this auspicious day 8/8/2024 , scientifically if I am not wrong is 8.8.8 which symbolizes infinity ,might sound crazy but was waiting for  (8.8pm ) to post this .Hope you found this post useful if it did so feel free to share your valuable inputs down below in the comments section would love to hear it from you all.

                                                             THANK YOU 

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