title: Clinical outcomes and success rates of quartz fiber post restorations: A retrospective study.
abstract: BACKGROUND
  Cast metal posts and dowels are inherently dark and, when metal-free restorations are used, could impair the definitive esthetic appearance. Quartz fiber posts could represent a reliable choice for restoring abutment teeth.
  
  
  OBJECTIVE
  The purpose of this study was to evaluate the long-term success rate of teeth restored with quartz fiber posts and fixed dental prostheses (FDPs).
  
  
  METHODS
  Ninety-nine teeth restored with 114 quartz fiber posts and FDPs were evaluated. The evaluation time ranged from 7 months to 9.25 years. The Kaplan-Meier method was used to obtain success curves. The influence of the tooth location, definitive restoration, and failure pattern upon the success function was analyzed with the log-rank test. The Cox regression test was used to evaluate possible predictors among the interactions of the observed parameters.
  
  
  RESULTS
  The success rate of the restorations was 85.86% in a mean period of 5.88 ±1.37 years, with an estimated success probability of 85% at 6.17 years. The statistical analysis identified the factors related to the arch (P=.045) and type of definitive restoration (P=.021) as significantly associated with success. Post debonding was the most frequent failure mode, followed by endodontic failure, with the latter not necessarily being related to the post itself. No root fractures were recorded. Twelve teeth out of the 14 that failed were restored again, bringing the overall survival rate of the teeth to 98%.
  
  
  CONCLUSIONS
  The rehabilitation of abutment teeth with quartz fiber posts can be considered a reliable procedure; however, adhesive techniques and luting materials require improvement.
authors.affiliation: Tutor, Department of Biomedical Sciences and neuromotor (DIBINEM), School of Dentistry, Unit of Odontostomatological Sciences, Division of Prosthodontics, Alma Mater Studiorum, University of Bologna, Bologna, Italy. Electronic address: candida.parisi@unibo.it.
authors.forename: Candida
authors.initials: C
authors.lastname: Parisi
authors.affiliation: Professor, Faculty of Dentistry, Federal University of Santa Maria, Rio Grande do Sul, Brazil.
authors.forename: Luiz F
authors.initials: LF
authors.lastname: Valandro
authors.affiliation: Researcher, Department of Biomedical Sciences and neuromotor (DIBINEM), School of Dentistry, Unit of Odontostomatological Sciences - Division of Prosthodontics, Alma Mater Studiorum, University of Bologna, Bologna, Italy.
authors.forename: Leonardo
authors.initials: L
authors.lastname: Ciocca
authors.affiliation: Aggregate Professor, Medical Statistics Course, Department of Biomedical Sciences and neuromotor (DIBINEM), Unit of Odontostomatological Sciences, Division of Orthodontics and Gnathology, Alma Mater Studiorum, University of Bologna, Bologna, Italy.
authors.forename: Maria R A
authors.initials: MR
authors.lastname: Gatto
authors.affiliation: Aggregate Professor, Dental Materials Course; Department of Biomedical Sciences and neuromotor (DIBINEM), Unit of Odontostomatological Sciences, Division of Prosthodontics, Alma Mater Studiorum, University of Bologna, Bologna, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Baldissara
mesh_terms: D000044:Dental Abutments; D003764:Dental Materials; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D006801:Humans; D053208:Kaplan-Meier Estimate; D011176:Post and Core Technique; D011791:Quartz; D012189:Retrospective Studies; D014092:Tooth Root
chemical_list: D003764:Dental Materials; D011791:Quartz