title: Micro push-out bond strengths of 2 fiber post types luted using different adhesive strategies.
abstract: OBJECTIVE
  The objective of this study was to evaluate the push-out bond strengths of carbon and glass fiber posts adhesively luted with Panavia F 2.0 and RelyX Unicem luting cements, as well as a modified application procedure using RelyX Unicem cement in combination with a single-bottle total-etch adhesive in 3 segments of teeth.
  
  
  METHODS
  Sixty single-rooted human maxillary central incisors and canines were sectioned below the cementoenamel junction, and the roots were endodontically treated. The roots were divided into 2 fiber-post groups, and then divided into 3 subgroups of 10 specimens each to test different luting strategies. Bonded specimens were cut (1-mm-thick sections) and push-out tests were performed (crosshead-speed, 0.5 mm/min). Failure modes were evaluated using a stereomicroscope at original magnification ×40.
  
  
  RESULTS
  Micro push-out bond strengths were significantly affected by the type of luting agent and the type of post (P < .05). In all root sections, the push-out bond strength values of glass fiber posts were significantly higher than that of carbon fiber posts (P < .05). Moreover, the highest push-out bond strengths were measured for Panavia F 2.0 and RelyX Unicem cements. These values were significantly higher than that of modified application procedure in the medium section for both glass- and carbon-fiber posts, and in the apical root sections only for glass-fiber post (P < .05). In each region, the modified application procedure showed the lowest bond strength values. Adhesive failure between dentin and cement was the most frequent type of failure.
  
  
  CONCLUSIONS
  In all root segments, the glass fiber post provided significantly increased post retention compared with the carbon fiber post, regardless of the luting strategy used.
authors.affiliation: Department of Operative Dentistry, Faculty of Dentistry, Istanbul University (34300) Capa, Istanbul, Turkey. uerdemir@hotmail.com
authors.forename: Ugur
authors.initials: U
authors.lastname: Erdemir
authors.forename: Emre
authors.initials: E
authors.lastname: Mumcu
authors.forename: Fulya Toksoy
authors.initials: FT
authors.lastname: Topcu
authors.forename: Esra
authors.initials: E
authors.lastname: Yildiz
authors.forename: Kivanc
authors.initials: K
authors.lastname: Yamanel
authors.forename: Mesut
authors.initials: M
authors.lastname: Akyol
mesh_terms: D002244:Carbon; D000077482:Carbon Fiber; D003188:Composite Resins; D003481:Cuspid; D001840:Dental Bonding / Q000379:methods*; D045662:Dental Etching / Q000379:methods; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D005898:Glass; D006801:Humans; D007180:Incisor; D015999:Multivariate Analysis; D011176:Post and Core Technique / Q000295:instrumentation*; D019279:Resin Cements; D018709:Statistics, Nonparametric
chemical_list: D000077482:Carbon Fiber; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C009753:fiberglass; D002244:Carbon