Yasmine M. Zaher , Alaa Abdelsalam El Baz And Maram Ezzat Khallaf,

ABSTRACT


Introduction: This Study Aimed To Compare The Effect On Dentin Hardness Between Different Concentrations Of Green Tea And Sodium Hypochlorite As Root Canal Irrigants. Methods: 80 Single Rooted Teeth Were Sectioned Longitudinally Into Halves, Embedded In Autopolymerizing Resins With Their Dentin Surfaces Exposed. After Polishing, The Microhardness Values Of The Untreated Dentin Surfaces Were Recorded By Using Vickers Tester In Apical, Middle And Coronal Regions. The Root Halves Were Randomly Assigned To 5 Groups Composed Of 16 Samples Each And Treated For 5 Minutes With One Of The Following Irrigants: 3 % GT,6% GT,12%GT, 5.25% NaOCl And Saline After Surface Treatment, Dentin Microhardness Values Were Recorded At Close Proximity To The Initial Indentation Areas. Experimental Data Were Statistically Analyzed By Using The Ttest And One-way ANOVA, Followed By Tukey?s Post Hoc Test.

Results: 12%GTand NaOCl Significantly Decreased Microhardness, While 3%, 6% GT And Saline Had No Significant Effect.