Microleakage comparison in temporary restorative materials in complex endodontic cavity

Abstract

To compare the mean microleakage (in millimeters) around two temporary restorative materials (zinc-oxide based versus light-cure resin based) at tooth-temporary restoration and temporary-permanent restoration interfaces, within the complex endodontic access cavities in the extracted human teeth. Thirty teeth randomly allocated into 2 experimental groups in this in-vitro experimental study. Teeth in each group had conventional class II cavities prepared and restored with the composite filling. After 14 days of aging in saline, complex endodontic access cavities were prepared in these teeth. This was followed by placement of either of the temporary restorative materials to seal the access cavities. After immersion in 1% methylene blue dye, teeth were sectioned and observed under stereomicroscope (magnification X25.6) Measurement was made at two interfaces ‘a’ and ‘b’ (temporary restoration-tooth and temporary restoration-pre-existing restoration), respectively. Depth of dye penetration in millimeters was recorded as the microleakage. Independent sample t-test was applied to compare the mean difference in dye penetration measurements in the two study groups at interfaces ‘a’ and ‘b's. A p-value of < 0.05 was taken as statistically significant. Light-cure resin-based material showed microleakage of 0.14 ±0.26 mm at interface ‘a’ and 0.07 ±0.17 mm at ‘b’, respectively. Whereas zinc-oxide based temporary restorative material showed microleakage of 0.54 ±0.42 mm at ‘a’ and 0.88 ±0.51 mm at ‘b’ interface. In complex endodontic access cavity, compared to zinc-oxide based material, light-cure resin-based material showed significantly less microleakage at the tooth-temporary restoration and pre-existing permanent filling-temporary restoration interfaces.