engleski

Effect of different laser treatments on the bond strength of intracanal fiber posts cemented with a self-adhesive resin cement

The aim of the study was to evaluate the influence of different laser activated irrigation (LAI) protocols and Nd:YAG laser irradiation on the bond strength of self- adhesively cemented fibre posts to root canal dentine. The study sample consisted of 84 human single-rooted permanent teeth, which were instrumented with ProTaper Next technique, and after obturation, the post space preparations were created for fiber-reinforced composite posts. The prepared samples were divided according to the laser treatment of the post space preparations: Group 1: LAI (Er:YAG) + saline solution (pulse energy: 20 mJ, repetition rate: 15 Hz) ; Group 2: LAI (Er:YAG) + QMiX solution (pulse energy: 20 mJ, repetition rate: 15 Hz) ; Group 3: LAI (Er, Cr:YSGG) + saline solution (pulse energy: 62.5 mJ, 20 Hz) ; Group 4: LAI (Er, Cr:YSGG) + QMiX (pulse energy: 62.5 mJ, 20 Hz) ; Nd:YAG laser (pulse energy: 100 mJ, 10 Hz). Fibre-reinforced posts were cemented with a self-adhesive cement (SpeedCEM, Ivoclar Vivadent, Liechtenstein). The bond strength was evaluated by the push-out bond strength test, and the mode of failure was determined under a stereomicroscope. The Kruskal-Wallis test was used for the intergroup comparative analysis with level of significance set at 5%. The highest bond strength was recorded in the group Er:YAG + QMiX (mean 3.401 MPa), followed by the Er, Cr:YSGG and the Er:YAG + saline solution (mean 1.111 MPa and 1, 094 MPa respectively), which did not differ significantly. The irradiation with the Nd:YAG laser casused similar bond strength as the Er, Cr:YSGG + QMiX. All laser protocols enhanced the bond strength of the self adhesive cement in root canal compared to only saline irrigation, and the Er:YAG laser activated QMiX solution provided the highest bond strength.

Er:YAG laser ; Er, Cr:YSGG laser ; luting cement ; push-out test ; post retention ; self-adhesive

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