title: Effect of post-space treatment on retention of fiber posts in different root regions using two self-etching systems.
abstract: The effect of post-space treatment on the retention of fiber posts in different root regions was evaluated using two self-etching systems. Post spaces were prepared in extracted premolars and then the root canals were subjected to one of the following post-space treatments: (i) water irrigation (control); (ii) etching with 35% phosphoric acid for 30 s; (iii) irrigation with 17% EDTA followed by 5.25% sodium hypochlorite (NaOCl); and (iv) ultrasonic agitation associated with 17% EDTA and 5.25% NaOCl irrigating solutions. The dentin surfaces were examined under scanning electron microscopy (SEM) after different post-space treatments. Fiber posts were then luted in the treated roots using resin cement with either Clearfil SE Bond or Clearfil DC Bond, and the thin-slice push-out test was performed. Scanning electron microscopy showed that all the post-space treatments tested were effective in removal of the smear layer of debris, or sealer/gutta-percha remnants, on the root canal. The apical push-out strength was affected by post-space treatment. Both 35% phosphoric acid etching and ultrasonic agitation in combination with EDTA/NaOCl irrigation improved the apical push-out strength of the fiber post, regardless of the type of self-etching system. A solo irrigation with an EDTA/NaOCl solution resulted in a lower apical push-out strength compared with the other two experimental groups.
authors.affiliation: Department of Prosthodontics, School of Stomatology, Fourth Military Medical University, Xi'an, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Huang
authors.forename: Yu
authors.initials: Y
authors.lastname: Xiong
authors.forename: Ming
authors.initials: M
authors.lastname: Fang
authors.forename: Ji-Hua
authors.initials: JH
authors.lastname: Chen
authors.forename: Marco
authors.initials: M
authors.lastname: Ferrari
mesh_terms: D000704:Analysis of Variance; D001641:Bicuspid; D002484:Cementation; D045662:Dental Etching / Q000379:methods*; D017268:Dental Prosthesis Retention; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents; D006801:Humans; D016014:Linear Models; D011176:Post and Core Technique; D019279:Resin Cements; D012388:Root Canal Irrigants; D018915:Root Canal Preparation / Q000379:methods*; D016369:Smear Layer; D018709:Statistics, Nonparametric
chemical_list: D017220:Dentin-Bonding Agents; D019279:Resin Cements; D012388:Root Canal Irrigants