title: [Bonding properties of four different cements to glass fiber posts after different treatments].
abstract: OBJECTIVE
  To investigate the effect of four different cements on the bonding effectiveness of root canal dentine and fiber post before and after different treatments.
  
  
  METHODS
  A total of 216 freshly extracted sound single-root-canal mandibular premolars were randomly divided into four groups. After root canal treatment and post space preparation being conducted on the premolars, Fuji I, Fuji Cem, RelyX Unicem, RelyX ARC were used respectively to bond fiber posts and were marked with group A, B, C, and D. Microleakage, micromorphology of the bonded interfaces, and pull-out bond strength were evaluated in the immediate group, thermocycling group and thermomechanical loading group.
  
  
  RESULTS
  In the immediate group, samples in group D showed the highest bond strength [(278 ± 26)N], followed by group C[ (219 ± 12) N], B[ (104 ± 23) N] and A[(73 ± 8) N]. Significant differences were found among all groups (P < 0.05) . A significant increase in bond strength was found in group A and B, whereas a decrease tendency was detected in group C and D after different treatments.Scanning electron microscope indicated that some little gaps were observed in group D after treatment, while a more intense bonding interface was found in group A and B. Microleakage scores in group A and B were lower than those in group C and D after aging treatments.
  
  
  CONCLUSIONS
  Resin cement can achieve a better immediate bond strength, while resin-modified resin cement may acquire a better long-term retention.
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Xiaojing
authors.initials: X
authors.lastname: Li
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Sanjun
authors.initials: S
authors.lastname: Zhao
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Lijuan
authors.initials: L
authors.lastname: Shen
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Xu
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Sun
authors.affiliation: Department of Prosthodontics, College of Stomatology, The Fourth Military Medical University, Xi'an 710032, China. Email: jhchen@fmmu.edu.cn.
authors.forename: Jihua
authors.initials: J
authors.lastname: Chen
mesh_terms: D017438:Bisphenol A-Glycidyl Methacrylate; D001840:Dental Bonding; D003739:Dental Cementum; D003799:Dental Stress Analysis; D003804:Dentin; D017220:Dentin-Bonding Agents; D005898:Glass; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D011176:Post and Core Technique; D019279:Resin Cements
chemical_list: D017220:Dentin-Bonding Agents; D005899:Glass Ionomer Cements; D011109:Polymethacrylic Acids; C462240:RelyX ARC; D019279:Resin Cements; C009753:fiberglass; C084541:Fuji glass-ionomer lining cement; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate