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Updated: Jan 7, 2026
In Vitro Evaluation of The Effects Of Er,Cr:YSGG and Diode Lasers Used on Titanium Cylinder
Published on: June 6, 2025
Evaluation of Er:YAG, Er,Cr:YSGG and diode lasers irradiation on radicular dentine fatigue strength using modified
Jaana Hannele Sippus1,2,3, Marcelo Capitanio1,2,3, Mustafa Murat Mutluay1,2,4
1Department of Cariology and Restorative Dentistry, Institute of Dentistry, University of Turku, Turku, Finland.
Abstract:
Laser-assisted endodontic treatments have gained popularity over the last decade. This study evaluated the flexural strength (FS), fatigue resistance, and surface characteristics of root dentine after laser-assisted endodontic protocols. Forty extracted, caries-free canines were used to prepare root dentine beams (n = 37/group). Beams were irradiated with (1) Er:YAG 2,940 nm (20 mJ, 0.3W, 15 Hz, 50 ms), (2) Er,Cr:YSGG 2,780 nm (2.25W, 50 Hz, 140 ms), and (3) 940 nm diode laser (1W, CW). The non-irradiated beams served as control group. Both erbium groups were treated with laser-activated irrigation with radial firing tips (RFTs); meanwhile, the diode group irradiation protocol, using RFT, was dry. Specimens underwent quasi-static loading (n = 12) and cyclic loading for fatigue behaviour (n = 25) using 4-point flexure test. Scanning electron microscopy analysis was performed. Data were analysed using analysis of variance and Kruskal-Wallis tests (α = 0.05). No significant difference was found in FS or fatigue resistance after laser-assisted treatment (p > 0.05), but endurance limits improved by 18% (Er:YAG) and 19% (Er,Cr:YSGG) compared to controls. These findings suggest that Er:YAG, Er,Cr:YSGG, and 940 nm diode lasers, when applied with recommended parameters, do not compromise dentine fatigue strength. Therefore, they may be safely integrated into root canal treatment protocols.
