title: Five-year evaluation of a low-shrinkage Silorane resin composite material: a randomized clinical trial.
abstract: OBJECTIVE
  The aim of the present study was to investigate the clinical performance of a low-shrinkage silorane-based composite material (Filtek™ Silorane, 3 M-Espe) by comparing it with a methacrylate-based composite material (Ceram•X™, Dentsply DeTrey).
  
  
  METHODS
  A number of 72 patients (158 restorations) participated in the study. After 5 years, a total of 107 restorations (52 Filtek™ Silorane, 55 Ceram•X™) in 48 patients were evaluated. Only class II restorations were included. All the restorations were placed by the same dentist, and the restorations were scored by one experienced dentist/evaluator. Materials were applied following the manufacturer's instructions. The primary outcome was marginal adaptation. Secondary outcomes were: marginal discoloration, approximal contact, anatomic form, fracture, secondary caries, and hypersensitivity.
  
  
  RESULTS
  After 5 years, no statistically significant differences between the two materials were found in marginal adaptation either occlusally (p = 0.96) or approximally (p = 0.62). No statistically significant differences were found between the two materials in terms of approximal contact, anatomic form, fractures, or discoloration. Secondary caries was found in two teeth (Filtek™ Silorane). One tooth showed hypersensitivity (Ceram•X™).
  
  
  CONCLUSIONS
  Restorations of both materials were clinically acceptable after 5 years. This study did not find any advantage of the silorane-based composite over the methacrylate-based composite, which indicates that the low-shrinkage of Filtek™ Silorane may not be a determinant factor for clinical success in class II cavities.
  
  
  CONCLUSIONS
  This paper is the first to evaluate the 5-year clinical performance of a low-shrinkage composite material.
authors.affiliation: Section of Pediatric Dentistry, Department of Dentistry, Aarhus University, Vennelyst Boulevard 9, DK-8000, Aarhus, Denmark, malene.schmidt@odontologi.au.dk.
authors.forename: Malene
authors.initials: M
authors.lastname: Schmidt
authors.forename: Irene
authors.initials: I
authors.lastname: Dige
authors.forename: Lise-Lotte
authors.initials: LL
authors.lastname: Kirkevang
authors.forename: Michael
authors.initials: M
authors.lastname: Vaeth
authors.forename: Preben
authors.initials: P
authors.lastname: Hørsted-Bindslev
mesh_terms: D000328:Adult; D000368:Aged; D006801:Humans; D008875:Middle Aged; D062047:Silorane Resins; D055815:Young Adult
chemical_list: D062047:Silorane Resins