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Objective: To evaluate the bond strength in lithium disilicate ceramics subjected to different times and methods of removal of conditioning residues.  Materials and methods: Bonding strength was evaluated in lithium disilicate discs after conditioning with hydrofluoric acid, the samples were subjected to different times and methods of removal: air-water spray, ultrasonic bath with distilled water 2 min, ultrasonic bath with distilled water 4 min, phosphoric acid 2 min, phosphoric acid 4 min. Cylinders were made of flowable composite resin that were positioned on the discs. The samples were subjected to micro-shear tests on a universal testing machine.  Results: The two-way ANOVA test and the Pos Hoc Tukey test (p&lt;0.05) revealed that the ultrasonic bath group with distilled water 2 min presented significant difference with respect to the phosphoric acid 4 min; however, it did not present significant difference with respect to the other groups.  Conclusion: The ultrasonic bath removal method for 2 min presented the highest value of bonding strength.

Evaluation of bond strength in lithium disilicate ceramics subjected to different times and methods of removal of hydrofluoric acid residues