title: Push-out bond strength between composite core buildup and fiber-reinforced posts after different surface treatments.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effects of different surface treatments on the pushout bond strength of fiber-reinforced posts to composite resin cores.
  
  
  METHODS
  Twenty-five translucent glass fiber posts were divided into five groups according to surface treatment methods as follows: an untreated control group, a group coated with silicated alumina particles (Co-Jet system, 3M ESPE, St. Paul, MN), and three groups undergoing surface preparation with erbium:yttrium-aluminum-garnet (Er:YAG) laser under three different power settings (150, 300, and 450 mJ at 10 Hz for 60 sec at 100 μs duration). After surface treatment, fiber posts were built up to a dual cure composite resin core. All of the specimens were set and sectioned perpendicularly along the long axis of the post using a saw. Two discs (thickness of 2 mm) were obtained from each post-core sample; finally, each group consisted of 10 samples. For artificial aging, the specimens were stored in water (37°C) for 24 h and subjected to thermal cycling (5000 cycles, 5-55°C, and 30 sec dwell time). Pushout tests were performed using a universal testing machine at a crosshead speed of 0.5 mm/min. The pushout pressure values were measured in MPa and analyzed using one way analysis of variance (ANOVA) and Tukey's honestly significant difference (HSD) post-hoc test (p<0.05). Fiber post surface images were obtained using a scanning electron microscope (SEM).
  
  
  RESULTS
  The bond strength values ranged between 14,949 and 23,879 MPa. The lowest values were observed in the groups treated with the Er:YAG laser at 150 mJ. Irradiation by the Er:YAG laser at 450 mJ affected the bond strength significantly (p<0.05). After Co-Jet sandblasting, the bond strength increased relatively (19,184 MPa).
  
  
  CONCLUSIONS
  Er:YAG laser irradiation enhanced the bond strength of fiber-reinforced posts to composite resin cores depending upon the power applied; Co-Jet sandblasting also increased the bond strength.
authors.affiliation: Department of Endodontics, Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey.
authors.forename: Hakan
authors.initials: H
authors.lastname: Arslan
authors.forename: Cagatay
authors.initials: C
authors.lastname: Barutcigil
authors.forename: Cenk Burak
authors.initials: CB
authors.lastname: Yılmaz
authors.forename: Kadir Tolga
authors.initials: KT
authors.lastname: Ceyhanlı
authors.forename: Hüseyin Sinan
authors.initials: HS
authors.lastname: Topcuoglu
mesh_terms: D003188:Composite Resins; D001840:Dental Bonding; D005898:Glass; D006801:Humans; D066298:In Vitro Techniques; D053844:Lasers, Solid-State; D011176:Post and Core Technique
chemical_list: D003188:Composite Resins; C009753:fiberglass