Effects of SWEEPS Laser-Activated Irrigation and Diode Laser Irradiation on Void Formation and Bond Strength of a New Premixed Calcium Silicate Sealer, BioRoot Flow—An In Vitro Study

The aim of this study was to evaluate the effect of two laser-assisted disinfection techniques on the porosity and bond strength (BS) of a new premixed calcium silicate sealer. Forty extracted human single-rooted premolars with one root canal were prepared up to 50/.05. Samples were randomly assigned to the groups (n = 10 each): 1. shock wave-enhanced emission of photoacoustic streaming (SWEEPS) (20 mJ, 15 Hz, 0.60 W, pulse duration 25 µs), 2. diode laser (975 nm, 1.5 W), 3. conventional needle and syringe irrigation (CI), and 4. control (C), with no final irrigation protocol. Root canals were filled with a premixed calcium silicate sealer using the single-cone obturation technique. Micro-CT scans were performed after two weeks to determine the presence of voids in the filling. Dentinal discs from the middle third were prepared for push-out testing. Kruskal–Wallis and post hoc Dunn tests were used, with significance set at 5%. Micro-CT analysis detected porosity in all samples, with no significant differences among the groups (p > 0.05). SWEEPS showed the highest BS values (median 3.233 MPa) and outperformed CI and C (median 1.923 and 1.989 MPa) (p < 0.05) overall. SWEEPS enhanced the BS compared with CI. Voids were present in all experimental groups.