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Push-out bond strength of calcium-silicate cements following Er:YAG and diode laser irradiation of root dentin

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Abstract

This study aimed to compare the effects of diode and Er:YAG laser irradiation of root dentin on push-out bond strength of mineral trioxide aggregate (MTA) and calcium-enriched mixture (CEM) cements. An in vitro experimental study was conducted on 90 dentin discs, cut out of freshly extracted human teeth. The discs were instrumented to obtain 1.3-mm lumen diameter. Then, they were randomly divided into six groups (n = 15). Groups 1 and 4 subjected to diode laser (Wiser, Doctor Smile, Italy) (980 nm, 1 W, continuous mode) for 10 s and filled with MTA and CEM cements. Groups 2 and 5 subjected to Er:YAG laser (Deka, Italy) (2940 nm, 1 W, 10 Hz, 230 μs) for 10 s and filled with MTA and CEM cements. Groups 3 and 6 (control groups) were filled with MTA and CEM cements without laser irradiation. After 7 days, push-out bond strength test was performed using a universal testing machine in order to evaluate the adhesion of the biomaterials to dentin. The samples were evaluated under a light microscope at × 40 magnification to determine the mode of fracture. Data were analyzed using two-way ANOVA. The highest push-out bond strength (8.76 ± 3.62 MPa) was noted in group 1 (diode/MTA), which was significantly higher than the other groups (P < 0.001). The lowest bond strength (2.61 ± 0.81) was noted in group 6 (control/CEM). Diode laser significantly increased the bond strength of both cements (P < 0.05), but Er:YAG laser irradiation only increased the bond strength of CEM and had no significant effect on MTA (P = 0.603). The bond strength of MTA control group was higher than that of CEM control group (P = 0.001). Push-out bond strength of endodontic cements can be affected by dentin conditioning with diode 980 nm and Er:YAG laser. Nine hundred eighty-nanometer diode laser irradiation is recommended to increase the bond strength of endodontic cements particularly the CEM cement to dentin.

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Acknowledgments

The authors would like to thank Tehran University of Medical Sciences, International Campus for the support.

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Authors and Affiliations

  1. Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran

    Fatemeh Mohammadian, Fatemeh Dibaji & Pegah Sarraf

  2. Private Practice, Tehran, Iran

    Soroush Soufi

  3. Laser Research Center of Dentistry (LRCD), Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran

    Nasim Chiniforush

  4. Dental Research Center, Dentistry Research Institute, Tehran, Iran

    Mohammad Javad Kharrazifard

  5. Statistical and Methodology Department, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran

    Mohammad Javad Kharrazifard

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  1. Fatemeh Mohammadian
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Correspondence to Pegah Sarraf.

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The study is an ex vivo study and does not include animal or human participants.

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Mohammadian, F., Soufi, S., Dibaji, F. et al. Push-out bond strength of calcium-silicate cements following Er:YAG and diode laser irradiation of root dentin. Lasers Med Sci 34, 201–207 (2019). https://doi.org/10.1007/s10103-018-02705-0

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