title: Evaluation of surface roughness and bond strength of quartz fiber posts after various pre-treatments.
abstract: OBJECTIVE
  Debonding at the post-adhesive interface is a major problem for quartz fiber posts. The objective of this study was to evaluate surface roughness and bond strength of quartz fiber posts after various surface treatments.
  
  
  METHODS
  Sixty-six quartz fiber posts were randomly divided into six experimental groups (n = 11) including group C, untreated (control); group SB, sandblasted; group SC, silica coated; group HF, hydrofluoric acid-etched; group N, Nd:YAG laser irradiated; group E, Er:YAG laser irradiated. Surface roughness of the posts was measured before and after pre-treatment. They were then bonded to resin cement and tensile bond strength was determined in a universal testing machine. Furthermore, two-way ANOVA and post hoc comparison tests (α = 0.05) were performed on all data.
  
  
  RESULTS
  The highest mean force value was observed in group SB and followed by group E. Tukey's HSD test showed that there was no statistical difference between group SB and group E (p = 0.673). The highest mean roughness value was observed in group SB and a significant difference was found between group SB and all other groups (p < 0.001). This study reveals that sandblasting and Er:YAG laser irradiation provided a significant increase in bond strength between quartz fiber posts and resin cement.
  
  
  CONCLUSIONS
  Sandblasting or Er:YAG laser-irradiation of the surface of the quartz fiber post before cementation is recommended for increasing retention.
authors.affiliation: Department of Restorative Dentistry.
authors.forename: Gulsah E
authors.initials: GE
authors.lastname: Akin
authors.forename: Hakan
authors.initials: H
authors.lastname: Akin
authors.forename: Cumhur
authors.initials: C
authors.lastname: Sipahi
authors.forename: Bulent
authors.initials: B
authors.lastname: Piskin
authors.forename: Omer
authors.initials: O
authors.lastname: Kirmali
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000537:Aluminum Oxide / Q000737:chemistry; D001840:Dental Bonding; D045662:Dental Etching / Q000379:methods; D003764:Dental Materials / Q000737:chemistry*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis / Q000295:instrumentation; D004853:Epoxy Resins / Q000737:chemistry; D006801:Humans; D006858:Hydrofluoric Acid / Q000737:chemistry; D053844:Lasers, Solid-State; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011176:Post and Core Technique / Q000295:instrumentation*; D011791:Quartz / Q000737:chemistry*; D011897:Random Allocation; D019279:Resin Cements / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
chemical_list: D003764:Dental Materials; D004853:Epoxy Resins; D019279:Resin Cements; D011791:Quartz; D012822:Silicon Dioxide; D000537:Aluminum Oxide; D006858:Hydrofluoric Acid
keywords: acid-etch; bond strength; laser; quartz fiber post; sandblasting; silica coating