The roles of temporary sealing materials used in endodontics are important. Especially, its marginal sealing properties affect endodontic success and failure in endodontic treatment.
The purpose of this in vitro study was to compare and evaluate the marginal sealing properties of various temporary restorative materials used in endodontic access cavity by using electrochemical method.
Standard endodontic access cavities were prepared in extracted human molar teeth and filled with Caviton, IRM, zinc oxide - eugenol cement. Each specimen was immersed in 1% solution of KCI, and applied a potential of 9V external power supply.
Margianl microleakage and water sorption were measured for marginal sealing effect evaluation in comparison with each group.
A comparative study of the obtained results have led to the following conclusions.
1. The Caviton group showed lower marginal microleakage value than the zinc oxide-eugenol cement and IRM group the 6th day after. The IRM group showed lower marginal microleakage value than the zinc oxide-eugenol cement group from the 6th day to the 12th day. But there was no significant difference between zinc oxide-eugenol cement and IRM group after the 13th day.
2. As time went by, marginal microleakage value was increased in Caviton, IRM, and zinc oxide-eugenol cement. But, they had effective marginal sealing property within the 5th day.
3. The water sorption showed the highest value in Caviton and the lowest in zinc oxide-eugenol cement. There was evidence of correlation between the water sorption and marginal microleakage of temporary sealing material, and then, high water sorption was the cause of low marginal microleakage value in temporary sealing materials.
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