Sealing Ability Of SDR Flowable Composite When Used As An Intra Orifice Barrier: An Invitro Study

Objective: To compare the coronal sealing ability of SDR flowable composite with other restorative materials.Methods: Root canal treatment were done for recently extracted 54 human mandibular premolar teeth with single canal and divided into two 6 groups : 4 experimental and 2 control groups.In the experimental group,3.5mm of the coronal part of the root was slightly modified to form a cavity and restored with the respective restorative material:(1)Filtek?Z350 XT with 3M Adper? Easy One(XT Group),SDR? flow+ with Xeno?V?(SX Group),SDR? flow+ with Prime & Bond?NT(SP Group)and GIC Fuji Type-II(GC Group),where as the samples in the control group were obturated with gutta percha and sealer alone till the coronal orifice.The samples in the experimental group and the positive control group(Group P)were coated with three layers of nail varnish excluding 1mm around the coronal orifice.The samples in the negative control group(Group N)were entirely coated with nail varnish including the coronal orifice.The samples were then incubated at37?C for 1 week,thermocycled in hot and cold baths for 500 cycles and stainedin 1% methylene blue solution for another 1 week.The samples were longitudinally split and depth of dye penetration was measured under a stereomicroscope.Results: The microleakage index of the SX group was significantly lower than the other groups(P<0.05),while the coronal sealing ability of GC group was significantly lower than that of the other groups(P<0.05)and was not significantly different than the positive control(P Group)(P<0.05).Conclusion: The glass ionomer cement can be considered unsuitable as an intra orifice barrier while SDR flowable composite in combination with Xeno? V? can be considered as an ideal intra orifice barrier.