title: Effect of fiber posts on the fracture resistance of maxillary central incisors with Class III restorations: An in vitro study.
abstract: BACKGROUND
  Endodontically treated teeth with Class III restorations show reduced fracture resistance. The placement of glass fiber posts may affect fracture resistance and should be further evaluated.
  
  
  OBJECTIVE
  The purpose of this in vitro study was to evaluate the effect of fiber posts on the fracture resistance of endodontically treated maxillary central incisors with Class III restorations.
  
  
  METHODS
  Forty extracted human maxillary central incisors were selected and divided into 4 test groups (n=10 each) according to the restoration strategy: control group; endodontically treated teeth without endodontic posts (GHT); endodontically treated teeth with 2 Class III restorations simulating coronal destruction (GCT); endodontically treated teeth with 2 Class III restorations and a carbon fiber post (GCF); and endodontically treated teeth with 2 Class III restorations and a glass-fiber post (GGF). The fiber posts were adhesively cemented with composite resin cement, and the cavities were restored with composite resin. After 3 months of water storage, all specimens were loaded at 45 degrees in a universal testing machine until fracture and evaluated for fracture mode. The data were analyzed using 1-way ANOVA, followed by the Tukey honest significant difference multiple comparisons test (α=.05).
  
  
  RESULTS
  Mean ±SD failure loads ranged from 687.5 ±84.0 N to 943.8 ±93.1 N. One-way ANOVA revealed a statistically signiﬁcant difference among the groups (P≤.05). The control group (GHT) had significantly higher resistance to fracture than the other groups (P≤.05).
  
  
  CONCLUSIONS
  Within the limitations of this in vitro study, placement of a fiber post did not affect the fracture resistance of endodontically treated maxillary central incisors with 2 Class III restorations.
authors.affiliation: Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, University of Aleppo, Allepo, Syria; and Lecturer, Department of Restorative Dental Sciences, Al-Farabi Dental College, Riyadh, Saudi Arabia.
authors.forename: Mohammed
authors.initials: M
authors.lastname: Abduljawad
authors.affiliation: Visiting Assistant Professor, Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University of Kiel, Kiel, Germany; Assistant Professor, Department of Fixed Prosthodontics, School of Dentistry, Ibb University, Ibb, Yemen; and Assistant Professor, Department of Restorative and Prosthetic Dental Sciences, School of Dentistry, Dar AlUloom University, Riyadh, Saudi Arabia. Electronic address: asamran@proth.uni-kiel.de.
authors.forename: Abdulaziz
authors.initials: A
authors.lastname: Samran
authors.affiliation: Assistant Professor, Department of Fixed Prosthodontics, School of Dentistry, Aleppo University, Aleppo, Syria.
authors.forename: Jadalkareem
authors.initials: J
authors.lastname: Kadour
authors.affiliation: Lecturer, Department of Fixed Prosthodontics, Faculty of Dentistry, University of Aleppo, Allepo, Syria; and Department of Restorative Dental Sciences, Al-Farabi Dental College, Riyadh, Saudi Arabia.
authors.forename: Wassim
authors.initials: W
authors.lastname: Karzoun
authors.affiliation: Professor and Chair, Department of Prosthodontics, Propaedeutics and Dental Materials, School of Dentistry, Christian-Albrechts University of Kiel, Kiel, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Kern
mesh_terms: D003188:Composite Resins; D003442:Crowns; D003738:Dental Cements; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D003793:Dental Restoration, Permanent / Q000295:instrumentation* / Q000379:methods*; D003799:Dental Stress Analysis; D005898:Glass / Q000737:chemistry*; D005899:Glass Ionomer Cements; D006801:Humans; D066298:In Vitro Techniques; D007180:Incisor / Q000293:injuries / Q000601:surgery*; D008422:Materials Testing; D008437:Maxilla; D011176:Post and Core Technique / Q000295:instrumentation; D019279:Resin Cements; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital / Q000628:therapy
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D003764:Dental Materials; D005899:Glass Ionomer Cements; D019279:Resin Cements; C009753:fiberglass