The Effect of Energy Densities on the Shear Bond Strength of Self-Adhering Flowable Composite to Er:YAG Pretreated Dentin.
Objective. To investigate the shear bond strength of self-adhering flowable resin composite, to dentin, after exposing it to Er:YAG laser radiation, at different energy densities.Materials and Methods. Sixty freshly extracted human third molars were randomly divided into five groups (n= 12). In the control group, dentin was left unirradiated, whereas, in the other four groups, dentin was irradiated with Er:YAG laser in noncontact mode (MSP mode = 100µs; 10 Hz; beam diameter: 1.3 mm; speed of 1 mm/second; air 6 mL/min; and water 4 mL/min), and respectively, with the following level of energy (50 mJ, 60 mJ, 80 mJ, and 100 mJ). Then, self-adhering flowable resin composite was bonded to all prepared dentin surfaces. Shear bond strength (SBS) was applied and fractured surfaces were examined using scanning electron microscopy.Results. SBS values showed significant differences in 60 mJ (P< 0.05) compared to other groups. Morphological evaluation revealed tags or plugs in dentinal tubules, especially when 60 mJ and 80 mJ were used. All four groups tended to leave more residues on the dentin surface, than the control group.Conclusion. Er:YAG dentin irradiation may enhance SBS of the self-adhering flowable resin composite when it is used at the appropriate low level of energy density.
Department of Restorative and Esthetic Dentistry, Lebanese University, Campus Rafic Hariri, Hadath, Beirut, Lebanon.
Paul
0000-0002-8303-5107
P
Nahas
Department of Oral and Maxillo-Facial Surgery, Faculty of Dentistry, Lebanese University, Campus Rafic Hariri, Hadath, Beirut, Lebanon.
Toni
0000-0002-8715-5392
T
Zeinoun
Department of Periodontology, Lebanese University, Campus Rafic Hariri, Hadath, Beirut, Lebanon.
Zeina
0000-0002-2821-9632
Z
Majzoub
Department of Operative Dentistry, School of Dentistry, Saint Joseph University, Beirut, Lebanon.
Karim
K
Corbani
Department of Dental Sciences, Faculty of Medicine, University of Liege, Liege, Belgium.
Samir
0000-0003-0321-9764
S
Nammour
D000134:Acid Etching, Dental; D000388:Air; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D003804:Dentin / Q000737:chemistry*; D006801:Humans; D053844:Lasers, Solid-State; D008855:Microscopy, Electron, Scanning; D008963:Molar / Q000737:chemistry*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D012371:Robotics; D033081:Shear Strength; D013718:Tensile Strength; D014867:Water / Q000737:chemistry
D003188:Composite Resins; D003738:Dental Cements; D019279:Resin Cements; D014867:Water