title: Two-year clinical evaluation of resin composite in posterior teeth: A randomized controlled study.
abstract: BACKGROUND
  Clinical evaluations as fundamental method to prove the efficiency of restorative materials.
  
  
  OBJECTIVE
  This study evaluated the clinical performance of restorative systems during 2 years of clinical service.
  
  
  METHODS
  This study assessed the clinical performance of restorative systems (Filtek Z250 and P60), during 2 years of clinical service, using the US Public Health Service system. The randomized and double-blind study comprising thirty volunteers. The restorations were evaluated at baseline, 6, 12, and 24 months. It was used the following criteria: marginal discoloration (MD), marginal integrity (MI), superficial texture (ST), wear (W), postoperative sensitivity (PS) and recurrent caries (RC).
  
  
  RESULTS
  Statistic analysis was performed using Fisher's and McNemar's exact tests and Pearsons's Chi-square in a significance level of 5%. The results at baseline and 24 months for Group I were: MD - 100, 100%; MI - 100, 88.6%; ST - 100, 94.3%; W - 100, 94.3%; PS - 100, 100%; RC - 100, 100%, of alpha scores; Group II: MD - 100, 97.1%; MI - 100, 91.4%; ST - 100, 94.3%; W - 100, 91.4%; PS - 100, 100%; RC - 100, 100%, of alpha scores. It was observed no statistical difference in the evaluated criteria and period.
  
  
  CONCLUSIONS
  After 24 months of evaluation, both restorative systems exhibited acceptable clinical performance.
authors: Department of Prosthetic Dentistry, Federal University of Espírito Santo, Vitória, ES, Brazil.
authors: Ranulfo
authors: R
authors: Gianordoli-Neto
authors: Department of Physics, Federal University of Ceará, Fortaleza, CE, Brazil.
authors: Gislaine Cristina
authors: GC
authors: Padovani
authors: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors: José
authors: J
authors: Mondelli
authors: Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil.
authors: Maria Fidela
authors: MF
authors: de Lima Navarro
authors: Department of Operative Dentistry, Federal University of Ceará, Fortaleza, CE, Brazil.
authors: Juliano Sartori
authors: JS
authors: Mendonça
authors: Department of Operative Dentistry, Federal University of Ceará, Fortaleza, CE, Brazil.
authors: Sérgio Lima
authors: SL
authors: Santiago
keywords: Clinical trial; composite resins; dental materials; randomized controlled trial