title: Retrospective evaluation of posterior direct composite restorations: 10-year findings.
abstract: OBJECTIVE
  This 10-year retrospective study investigated the differences in the changes and the longevity of Class II restorations using 4 similar microhybrid resin composites (Filtek Z250, Herculite XR, Gradia Direct Posterior, Renew).
  
  
  METHODS
  Data were collected from patient records. Those patients who received posterior restoration between 2001 and 2003, and who still visited the clinical practice for regular check-up visits were selected. A total of 225 adult patients (86 males, 139 females) with 701 restorations were evaluated by 2 operators using the USPHS criteria. Data were analyzed with Fisher's Exact Test, Pearson's Chi-Square Test and Kaplan-Meier analysis (p<0.05).
  
  
  RESULTS
  A failure rate of 2.1% was detected. The reasons of failures included restoration fracture, secondary caries and endodontic treatment. Similar survival rates for Gradia Direct Posterior (91.25%) and Renew (92.19%) were observed; better performance was observed with the Filtek Z250 (99.1%) and Herculite XR (98.64%). There was a higher probability of failure in 3 surface (n=10) than in 2 surface (n=5) restorations (p<0.001), and this rate was similar when molars (n=8) and premolars (n=7) were compared. The most frequent but clinically acceptable deficiency was the marginal discoloration.
  
  
  CONCLUSIONS
  All four microhybrid resin composites showed acceptable clinical durability in Class II restorations during the 10-year follow-up period, with an overall survival rate of >97.8%. Higher rates of failures and deficiencies were observed with the Renew (fracture) and Gradia Direct Posterior (color match), respectively.
authors.affiliation: Department of Restorative Dentistry and Periodontology, University of Pécs, Pécs, Hungary. Electronic address: lempel.edina@pte.hu.
authors.forename: Edina
authors.initials: E
authors.lastname: Lempel
authors.affiliation: Faculty of Sciences, University of Pécs, Pécs, Hungary.
authors.forename: Ákos
authors.initials: Á
authors.lastname: Tóth
authors.affiliation: Department of Restorative Dentistry and Periodontology, University of Pécs, Pécs, Hungary.
authors.forename: Tamás
authors.initials: T
authors.lastname: Fábián
authors.affiliation: Department of Restorative Dentistry and Periodontology, University of Pécs, Pécs, Hungary.
authors.forename: Károly
authors.initials: K
authors.lastname: Krajczár
authors.affiliation: Department of Oral and Maxillofacial Surgery, University of Pécs, Pécs, Hungary.
authors.forename: József
authors.initials: J
authors.lastname: Szalma
mesh_terms: D000328:Adult; D003188:Composite Resins; D019232:Dental Restoration Failure / Q000706:statistics & numerical data*; D003793:Dental Restoration, Permanent; D005260:Female; D006801:Humans; D008297:Male; D008689:Methacrylates; D008875:Middle Aged; D019279:Resin Cements; D012189:Retrospective Studies
chemical_list: D003188:Composite Resins; C444701:Filtek Z250; C470230:Gradia; D008689:Methacrylates; C485364:Renew composite; D019279:Resin Cements; C065770:Herculite XR
keywords: Class II restoration; Longevity; Microhybrid resin composite; USPHS evaluation