Microleakage of fusio[TM] liquid dentin self adhesive composite in class v cavities

ABSTRACT

Microleakage at tooth/restoration interface is one of the major causes for any composite restoration failure. Composite marginal adaptation is more critical in class V Cavities where there is little or no enamel at the cervical margins, and the restoration comes in contact with cementum. This decreases adhesion considerably, facilitating shrinkage of the material in occlusal direction leaving a gingival gap. The aim of this study was to evaluate microleakage of the new self adhesive composite "Fusio™ Liquid Dentin" in Class V cavities with enamel and dentin. Standardized thirty class V cavities were prepared on buccal and lingual surfaces of 15 human premolar teeth, with occlusal and gingival margins at the enamel and cementum/dentin levels respectively. Specimens were divided into 3 groups with 10 samples each. Group 1 10 cavities restored with Fusio TM Liquid Dentin [FLD] -A2 shade [self adhesive flowable composite, Pentron Clinical Technologies, Wallingford, CT, USA] without etching and bonding, Group 2 10 cavities restored with FLD -A2 shade with etching only and Group 3 10 cavities restored with FLD -A2 shade with etching and bonding. After being stored in distilled water and finished, the teeth were thermocycled, immersed in a buffered 2% aqueous solution of methylene blue for 2 hours and then embedded in clear acrylic resin blocks. They were sectioned and the depth of tracer penetration was measured with periodontal probe and magnifying lens. The results were analyzed using one way ANOVA and t-test at 0.05 level of significance. There was a statistically significant difference between the six groups being tested. All the composite materials being tested showed statistically insignificant differences in occlusal dye penetration [P>/=0.05] and significant differences in gingival dye penetration [Penamel margins but was inadequate to establish good marginal sealing with dentin margins