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The stickiness of nanofilled resin composite is still one of its major disadvantages that haven’t been corrected yet. Many techniques have been developed to overcome this issue, including the use of bonding agent as instrument lubricants. This research aimed to compare between 2 bonding agents when used as instrument lubricants and their effects on water sorption and solubility of nanofilled resin composite according to the number of increments applied. A total of 45 samples of nanofilled resin composite were prepared and divided into three groups according to the used instrument lubricants. The specimens were divided based on the number of increments applied (2, 3 and 4 increments). Water sorption and solubility were measured using calibrated electronic microbalance. Resin composite applied with 1-step adhesive system (5th generation) and 2-steps adhesive system (7th generation) showed a significant difference of water sorption when compared with nanofilled resin composite applied without lubricants. Resin composite applied with both lubricants showed insignificant difference in solubility when compared to nanofilled resin composite applied without lubricants. It was concluded that, using adhesive resin as instrument lubricants for nanofilled resin composite showed a significant effect on water sorption of the specimens. There was insignificant effect on the solubility of the nanofilled resin composite after using of the adhesive resin as instrument lubricants.

Effect of Instrument Lubricant on Water Sorption and Solubility of Incrementally Applied Nanofilled Resin Composite