Spectrophotometric evaluation of microleakage using bulkfill liners cured with qth and led lights

Introduction: Polymerization shrinkage and microleakage primarily cause failure of composite restorations. Bulkfill flowable composite liners have lesser polymerization stress than the conventional flowables. Authors have differing opinions as to the effect of QTH and LED lights on microleakage.
Aim: This study evaluated Spectrophotometrically if bulkfill flowable composite liners reduced microleakage compared to conventional flowable composites liners and if curing lights (QTH versus LED) affected microleakage.
Methodology: 72 standardised class V cavities on the buccal surface of premolars with occlusal margins in the enamel and cervical margins in the cementum, were restored with 1mm of the following liners depending of the group they were assigned to, after etching and bonding was done according to the manufacterer’s instructions:
• Group 1:FiltekTM Z350 XT Flowable Restorative (3M ESPE, USA)
• Group 2: x-tra base (VOCO, Cuxhaven, Germany)
• Group 3: Smart Dentin Replacement (SDR) (DENTSPLY, Germany)
Liners were with overlaid with FiltekTM Z 350 XT Universal Restorative. Each group was divided into subgroups A and B cured by QTH and LED lights respectively. Microleakage was evaluated by the dye extraction technique Spectrophotometrically.
Result
There was statistically no significant difference in the microleakage seen among the liner groups or the curing light subgroups.