Authors : Maryam Moezizadeh and Seddigheh Moayedi
Abstract: Cements such as zinc oxide eugenol have been frequently used as temporary restorations, but, the presence of eugenol in cement can negatively affect the seal of the permanent restorations like composite resin. To evaluate the microleakage of composite restorations following pre-treatment with ZOE temporary cements of different powder: liquid ratios and compare them with eugenol-free temporary cement. Class V cavities were prepared on the buccal surfaces of 32 freshly extracted human premolars. Teeth were divided into 4 groups of 8 each. Gr.1-Received no temporary restoration. Gr 2 and 3-Filled with Type III ZOE mixed at P: L ratio of 10 g: 1 g and 10 g: 2 g, respectively. Gr 4: Received eugenol-free cement (RelyX Temp NE). After one week storage in water, temporary fillings were removed and cavities were restored with composite resin (Z100). The restorations were finished , thermally stressed for 500 cycles at 5�56�C , subjected to dye penetration testing and observed under stereomicroscope at X40 magnification. Results were analyzed using Kruskal-Wallis and Mann-Whitney tests. At both enamel and dentin margins, the microleakage associated with group 3 was significantly more than group 1, 2 and 4. Pre-treatment of cavity with ZOE mixed at a P: L ratio of 10 g: 2 g significantly increased microleakage and is not recommended clinically.
Maryam Moezizadeh and Seddigheh Moayedi , 2008. Effect of Temporary Cements on Microleakage of Composite Restorations: An In vitro Study. Research Journal of Biological Sciences, 3: 1070-1075.