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      • Calcium hydroxide medicated root canals obturated   using zinc oxide eugenol sealers showed more apical   leakage.
          •  Calcium hydroxide+eugenol compound = calcium   eugenolate.
          •  Interaction between calcium hydroxide and zinc       oxide eugenol sealers produce a rapid setting   reaction.
      •  Calcium hydroxide medicated root canals obturated using AH plus sealer showed less leakage than all groups, except control group: sub-group D (less significant).
    • Under the condition of this study, calcium hydroxide intra canal medication increased apical leakage of root canal fillings with both ZOE and AH Plus Cement Sealers.
    •          However, canals obturated with ZOE sealer had more leakage.

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