title: [Comparative research for micro-push-out bond strengths of glass fiber posts treated by poly-dopamine or silane coupling agent].
abstract: OBJECTIVE
  To evaluate the micro-push-out bond strengths of prefabricated glass fiber posts with poly-dopamine functionalized to root dentin using resin cements, contrasted with silane treatment.
  
  
  METHODS
  In the study, 30 glass fiber posts were randomly divided into 3 groups (10 posts in each group) for different surface treatments. Group 1, treated with poly-dopa; Group 2, treated with silane coupling agent for 60s; Group 3, no surface treatment (Control group). The 30 extracted human, single-rooted teeth were endodontically treated and a 9 mm post space was prepared in each tooth with post drills provided by the manufacturer. Following post cementation, the specimens were stored in distilled water at 37 °C for 7 days. The micro-push-out bond strengths were tested using a universal testing machine (0.5 mm/min), and the failure modes were examined with a stereomicroscope. The data of the three groups were statistically analyzed using the one-way ANOVA test(α= 0.05).
  
  
  RESULTS
  The bond strengths were (7.909 ± 1.987) MPa for Group 1, (5.906 ± 0.620) MPa for Group 2, and 4.678 ± 0.910 MPa for Group 3. The bond strength of poly-dopamine group was significantly higher than that of the silane group (P<0.05).
  
  
  CONCLUSIONS
  Contrasted with silane treatment, surface poly-dopamine functionalization was confirmed to be a more reliable method for improving the bond strength of resin luting agents to fiber posts.
authors.affiliation: Second Clinical Division, Peking University School and Hospital of Stomatology, Beijing 100101, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Chen
authors.affiliation: First Clinical Division, Peking University School and Hospital of Stomatology, Beijing 100034, China.
authors.forename: Yong-liang
authors.initials: YL
authors.lastname: Su
authors.affiliation: State Key Laboratory of Organic-inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Cai
authors.affiliation: Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081,China.
authors.forename: Yun-yang
authors.initials: YY
authors.lastname: Bai
authors.affiliation: State Key Laboratory of Organic-inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Su
authors.affiliation: Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081,China.
authors.forename: Xin-zhi
authors.initials: XZ
authors.lastname: Wang
mesh_terms: D002484:Cementation; D001840:Dental Bonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D004298:Dopamine; D005898:Glass; D006801:Humans; D008422:Materials Testing; D011176:Post and Core Technique; D019279:Resin Cements; D012821:Silanes; D014092:Tooth Root
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012821:Silanes; C009753:fiberglass; D004298:Dopamine