Evaluation of the effect of different irrigation protocols on cleanliness and adhesion of epoxy-resin and glass-ionomer based sealers : An in-vitro study / Abdullah Salem Ibrahim ; Supervised Maged Negm , Alaa Elbaz

Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Endodontics

A total of seventy-six single canaled, recently extracted permanent human teeth were selected for the evaluation of the effect of different irrigation protocols on cleanliness and adhesion of epoxy-resin and glass-ionomer based sealers. The teeth were decapitated at CEJ, instrumented using K3 0.06 taper NiTi rotary system. They were divided into four main groups (each of 19 teeth) according to different irrigation protocols used during instrumentation: Group I: 1:1 mixture of 5.25% NaOCl+18% Etidronic acid (HEBP). Group II: 1:1 mixture of 5.25% NaOCl +18% Etidronic acid (HEBP), followed by 17% EDTA as a final rinse. Group III: 17% EDTA. Group IV: 5.25% NaOCl (control group). The quantity of irrigation was 5 ml for 2 minutes, each time during instrumentation. After complete instrumentation, a final rinse of 5 ml for 2 minutes of distilled water was done to remove any precipitates from irrigation regimens followed by paper points to dry and desiccate the canals. Sixteen roots of each group were chosen for obturation to evaluate the effect of different irrigation protocols on adhesion. They were subdivided into 2 subgroups (each of 8 roots), according to type of sealer used: 1A single gutta-percha cone size 40 taper 0.06 with AH Plus root canal sealer. 2A single Activ GP cone size 40 taper 0.06 with Activ GP root canal sealer. After 48 hours, the obturated roots were horizontally divided into three equal sections (cervical, middle, and apical). The middle third specimens were subject to push-out test by means of an Instron testing machine to examine the push-out bond strength

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