title: Two-year clinical evaluation of packable and nanostructured resin-based composites placed with two techniques.
abstract: BACKGROUND
  The authors conducted a two-year clinical trial to evaluate the effectiveness of two resin-based composite materials for Class II restorations placed according to two filling techniques.
  
  
  METHODS
  Twenty-six patients received 105 Class II restorations, which the authors distributed randomly into three groups of 35 each. The resin-based composite restorations in group A were composed of average-density material (Ceram X mono [CXM], Dentsply DeTrey, Konstanz, Germany) placed according to the oblique incremental technique (OIT). Restorations in group B were composed of average- and high-density materials (CXM and SureFil [SF], Dentsply DeTrey) placed according to the modified incremental technique (MIT). Restorations in group C were composed of the high-density material (SF) placed with the OIT. The authors evaluated the restorations according to modified U.S. Public Health Service criteria.
  
  
  RESULTS
  At the two-year recall visit, 92 (88 percent) of 105 restorations were available for examination. Restorations in groups A, B and C had success rates of 96.7 percent (29 of 30 restorations), 96.8 percent (30 of 31) and 100 percent (31 of 31), respectively. Esthetic parameters revealed significant (P<.05) cavo-surface marginal discoloration in group B and a rougher surface in group A. With regard to functional parameters, one (3.3 percent) of 30 restorations in group A exhibited reparable changes in marginal integrity.
  
  
  CONCLUSIONS
  Restorations in group B performed worse (P<.05) in terms of esthetic (cavosurface marginal discoloration) and functional (marginal integrity) parameters. Clinical effectiveness was highest in group C and lowest in group B.
  
  
  CONCLUSIONS
  The two resin-based composite materials are effective in Class II clinical situations when placed with either the OIT or MIT.
authors.affiliation: Department of Medical Sciences, Faculty of Health Sciences, University Fernando Pessoa, Porto, Portugal. patmon@ufp.edu.pt
authors.forename: Patrícia Manarte
authors.initials: PM
authors.lastname: Monteiro
authors.forename: Maria Conceição
authors.initials: MC
authors.lastname: Manso
authors.forename: Sandra
authors.initials: S
authors.lastname: Gavinha
authors.forename: Paulo
authors.initials: P
authors.lastname: Melo
mesh_terms: D000134:Acid Etching, Dental; D000293:Adolescent; D000328:Adult; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003430:Cross-Sectional Studies; D003737:Dental Cavity Preparation / Q000145:classification; D018772:Dental Marginal Adaptation; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods*; D004955:Esthetics, Dental; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008434:Matrix Bands; D008875:Middle Aged; D049329:Nanostructures / Q000737:chemistry*; D009910:Oral Hygiene; D011109:Polymethacrylic Acids / Q000737:chemistry; D012907:Smoking; D013499:Surface Properties; D055815:Young Adult
chemical_list: C520091:CeramX; D003188:Composite Resins; D003764:Dental Materials; D011109:Polymethacrylic Acids; C103500:Prime & Bond; C403464:SureFil packable composite; D017438:Bisphenol A-Glycidyl Methacrylate