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

  • Fatemeh Mohammadian
  • Soroush Soufi
  • Fatemeh Dibaji
  • Pegah Sarraf
  • Nasim Chiniforush
  • Mohammad Javad Kharrazifard
Original Article

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.

Keywords

Mineral trioxide aggregate Calcium-enriched mixture cement Diode laser Er:YAG laser Push-out bond strength 

Notes

Acknowledgments

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

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

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

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Copyright information

© Springer-Verlag London Ltd., part of Springer Nature 2019

Authors and Affiliations

  1. 1.Department of Endodontics, School of DentistryTehran University of Medical SciencesTehranIran
  2. 2.Private PracticeTehranIran
  3. 3.Laser Research Center of Dentistry (LRCD), Dentistry Research InstituteTehran University of Medical SciencesTehranIran
  4. 4.Dental Research CenterDentistry Research InstituteTehranIran
  5. 5.Statistical and Methodology Department, School of DentistryTehran University of Medical SciencesTehranIran

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