title: Effect of silver diamine fluoride and ammonium hexafluorosilicate applications with and without Er:YAG laser irradiation on the microtensile bond strength in sound and caries-affected dentin.
abstract: OBJECTIVE
  Cariostatic and preventive agents are applied to create caries-resistant dentin surfaces and may affect subsequent resin bonding. The aim of this study was to investigate the effect of different agents with and without Er:YAG laser irradiation on the microtensile bond strength (µTBS) of resin composite to sound dentin (SD) and caries-affected dentin (CAD), and to assess the morphological and chemical changes in the specimens.
  
  
  METHODS
  Ninety-six extracted molar teeth were divided into a control group (deionized water) and two experimental groups (ammonium hexafluorosilicate [SiF], silver diamine fluoride [SDF]), that subdivided according to different conditions (SD, CAD, SD+laser irradiation, CAD+laser irradiation). After treatment procedures, the teeth were restored and the µTBS was tested with a universal testing machine. Morover, 144 teeth were prepared and after treatment modalities; morphological changes of the surface were investigated and elemental analyses were performed using scanning electron microscope/energy dispersive spectroscopy (SEM-EDS). The data were analyzed using Kruskal-Wallis and Mann-Whitney U tests.
  
  
  RESULTS
  SDF and SiF applications reduced the µTBS values in both the SD and CAD subgroups (P < 0.05). Laser irradiation increased the µTBS values in the SiF group and the values were adversely affected in the SDF group (P < 0.05). Fluoride content of the specimens increased in all of the treatment groups, compared with the control group. Silver content was detected only in the SDF group, and silicon was detected only in the SiF group.
  
  
  CONCLUSIONS
  The µTBS values of resin composite, surface morphology and chemical characteristics of dentin were affected by the material type, dentin condition and laser irradiation and the use of SiF and SDF solutions under the resin restorations do not seem appropriate.
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Ebru
authors.initials: E
authors.lastname: Kucukyilmaz
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Selcuk
authors.initials: S
authors.lastname: Savas
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Merve
authors.initials: M
authors.lastname: Akcay
authors.affiliation: Department of Pediatric Dentistry, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Basak
authors.initials: B
authors.lastname: Bolukbasi
mesh_terms: D003731:Dental Caries; D003804:Dentin / Q000187:drug effects* / Q000528:radiation effects*; D005459:Fluorides / Q000494:pharmacology*; D005460:Fluorides, Topical; D006801:Humans; D053844:Lasers, Solid-State; D000644:Quaternary Ammonium Compounds / Q000494:pharmacology*; D012824:Silicic Acid / Q000494:pharmacology*; D018030:Silver Compounds; D013718:Tensile Strength / Q000187:drug effects* / Q000528:radiation effects*
chemical_list: D005460:Fluorides, Topical; D000644:Quaternary Ammonium Compounds; D018030:Silver Compounds; D012824:Silicic Acid; C004832:hexafluorosilicate; C024633:silver diamine fluoride; D005459:Fluorides
keywords: ammonium hexafluorosilicate; caries-affected dentin; laser irradiation; microtensile; silver diamine fluoride