title: Effects of Dentin Moisture on Cementation of Fiber Posts to Root Canals.
abstract: OBJECTIVE
  Achieving optimal moisture inside the root canal is a challenge during bonding of fiberglass posts. This study evaluated the effect of different moisture patterns on the push-out bond strength (PBS) and nanoleakage (NL) of fiber posts bonded to the root canal of two simplified etch-and-rinse adhesives.
  
  
  METHODS
  The roots of 72 human premolars were endodontically prepared and divided into 6 groups according to the combination of the main factors: adhesive (Ambar and Adper Single Bond 2) and moisture (dry, wet, and overwet). The posts were cemented and after 1 week, the roots were cross sectioned into 6 disks. Two disks each were obtained from the cervical, middle, and apical thirds, and the PBS test was carried out (0.5 mm/min; n = 8). The NL was evaluated by scanning electron microscopy after the immersion of specimens in 50% silver nitrate (n = 4). The failure pattern was examined on all debonded specimens. Data were analyzed by three-way repeated measures ANOVA and Tukey's test (5%).
  
  
  RESULTS
  For both adhesives, higher PBS values and lower NL were observed in the wet groups, and lower PBS and higher NL in the dry group. In general, the overwet condition showed intermediate results.
  
  
  CONCLUSIONS
  The root dentin walls should be left slightly moist before performing fiber post cementation procedures.
authors.forename: Eluise C
authors.initials: EC
authors.lastname: Rezende
authors.forename: Giovana Mongruel
authors.initials: GM
authors.lastname: Gomes
authors.forename: Anna Luiza
authors.initials: AL
authors.lastname: Szesz
authors.forename: Carlos Eduardo
authors.initials: CE
authors.lastname: da Silveira Bueno
authors.forename: Alessandra
authors.initials: A
authors.lastname: Reis
authors.forename: Alessandro D
authors.initials: AD
authors.lastname: Loguercio
mesh_terms: D002484:Cementation / Q000379:methods*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry; D045662:Dental Etching / Q000379:methods; D003763:Dental Leakage / Q000145:classification; D003764:Dental Materials / Q000737:chemistry*; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D003890:Desiccation; D005898:Glass / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D016622:Silver Staining; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D019227:Tooth Apex / Q000648:ultrastructure; D019553:Tooth, Nonvital / Q000473:pathology; D014867:Water / Q000737:chemistry
chemical_list: C554641:Adper single bond 2; C000604625:Ambar; D003738:Dental Cements; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D008689:Methacrylates; C009753:fiberglass; D014867:Water