Microleakage Between Resin Cement and Eugenol Contaminated Cavosurface Margin After Using Various Irrigants
The purpose of this research was to study microleakage between resin cement and eugenol contaminated cavosurface margin after using various irrigants. Cavities Class V (3×3×1.5 mm) of 70 bovine teeth were prepared on the labial surface parallel to the cement-enamel junction, 1.5 mm above and below the CEJ. The indirect resin composite inlays were prepared, and water was used as a separating media and removed from the cavity. After that, cavities Class V were restored with temporary filling (zinc oxide eugenol) for 7 days. Then temporary fillings were removed by using ultrasonic scaler. The teeth were randomly divided into 4 groups, group 1(control): irrigated cavities with NSS 2 ml, group 2: irrigated cavities with 2.5% NaOCl 5 ml and NSS 2 ml, group 3: irrigated cavities with 17%EDTA 5 ml and NSS 2 ml, group 4: irrigated cavities with 17%EDTA 5 ml, 2.5% NaOCl 5 ml and NSS 2 ml. After that, indirect composite inlays were cemented in the cavities with superbond C&B. The apices of bovine roots were sealed with self-cured acrylic resin. The teeth surface were coated with nail vanish except cavosurface margin of restoration. All specimens were stored in distilled water for 24 hours at 37°C and immersion in 0.5% basic fuchsin for 24 hours at room temperature. The dye penetration was measured on the sectioned specimen at the tooth-cement interface of enamel and dentin margin and recorded with graded criteria under stereomicroscope (100x).The results showed that all groups had microleakage at both sides of cavity (enamel and dentin margin), and enamel margins had microleakage lower than dentin margins. The microleakage of dentin margins (gingival margins) of group1 and 2 was significantly different greater than those of group 3 and 4 (p<0.05). In conclusion, 17% EDTA followed by NSS or 17% EDTA followed by 2.5% NaOCl and NSS are effective irrigants for cleaning contaminated eugenol margin.
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