title: Clinical evaluation of resin-based composites in posterior restorations: a 3-year study.
abstract: OBJECTIVE
  The aim of this study was to evaluate the clinical performance of a nanohybrid and a microhybrid composite in class I and II restorations after 3 years.
  
  
  METHODS
  A total of 82 class I and class II restorations were performed in 31 patients (10 males and 21 females) using Grandio and QuiXfil with self-etch adhesives (Futurabond and Xeno III). The restorations were clinically evaluated by 2 operators 1 week after placement (baseline) and at 6 months and 1, 2, and 3 years using modified United States Public Health Service (USPHS) criteria. At the 3-year follow-up, 62 class I and class II cavities were reevaluated in 23 patients (7 males and 16 females). Statistical analysis was performed using Pearson's χ(2) and Fisher's exact tests (p < 0.05).
  
  
  RESULTS
  At the 6-month follow-up, all restorations received Alfa scores with respect to each evaluation criterion. At the 1-year follow-up, 2 QuiXfil restorations had to be replaced and Grandio restorations started to deteriorate in terms of marginal adaptation. At the end of 2 years, 9 Grandio restorations showed significant deterioration of the surface properties, demonstrating Bravo scores. At the end of 3 years, no significant differences were observed regarding color match, marginal adaptation, secondary caries, marginal discoloration, and anatomic form loss between the evaluated materials in 25 class I and 37 class II restorations. At the 3-year follow-up, Grandio restorations had 21% Bravo scores and showed significant deterioration of the surface properties, which were still clinically acceptable according to USPHS criteria. Three QuiXfil and 1 Grandio restorations were replaced because of secondary caries and loss of retention.
  
  
  CONCLUSIONS
  Both the nanohybrid (Grandio) and the microhybrid (QuiXfil) composites were clinically functional after 3 years.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, Baskent University, Ankara, Turkey.
authors.forename: Çiğdem
authors.initials: Ç
authors.lastname: Çelik
authors.forename: Neslihan
authors.initials: N
authors.lastname: Arhun
authors.forename: Kivanc
authors.initials: K
authors.lastname: Yamanel
mesh_terms: D000293:Adolescent; D000328:Adult; D003188:Composite Resins; D003731:Dental Caries / Q000473:pathology / Q000601:surgery*; D003793:Dental Restoration, Permanent; D017220:Dentin-Bonding Agents; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008689:Methacrylates; D008875:Middle Aged; D013997:Time Factors; D014421:Turkey; D055815:Young Adult
chemical_list: D003188:Composite Resins; D017220:Dentin-Bonding Agents; C509998:Grandio; D008689:Methacrylates; C510379:QuiXfil; C487957:Xeno III; C512545:futurabond NR