MICROLEAKAGE OF TEMPORARY RESTORATIONS AFTER THERMOCYCLING AND MECHANICAL LOADING

The marginal seal of four temporary filling materials in endodontic ac cess cavities was examined in vitro after thermocycling and mechanical loading using dye penetration tests and a quantitative marginal analy sis of replicas in the SEM, Class I cavities were prepared in 44 extra cted human molars and filled either with Cavit(R), Kalsogen(R), IRM(R) , or TERM(R). After setting the reaction and thermocycling procedure, Cavit(R) showed less microleakage in the dye penetration test and fewe r marginal crevices in the quantitative marginal analysis, After loadi ng, two Cavit(R) fillings collapsed into the endodontic cavity. The ma rginal conditions of TERM(R) were comparable to Cavit(R) after thermoc ycling and mechanical loading. Kalsogen(R) and IRM(R) restorations dem onstrated significantly increased microleakage and a higher percentage of marginal crevices after thermocycling and loading, In contrast to dye penetration tests, the effects of different factors on the margina l integrity of temporary fillings can be examined with the replica tec hnique and quantitative marginal analysis.