title: Clinical evaluation of packable and conventional hybrid posterior resin-based composites: results at 3.5 years.
abstract: BACKGROUND
  The authors evaluated clinical performances of a packable and a conventional hybrid resin-based composite used with a self-etch adhesive system.
  
  
  METHODS
  Three dentists placed 105 posterior restorations in 65 adults. They placed a packable (SureFil, Dentsply DeTrey GmbH, Konstanz, Germany) and a conventional (Spectrum, Dentsply DeTrey GmbH) resin-based composite using a self-etch resin adhesive system. The authors evaluated the restorations using Ryge modified criteria, photographs and die stone replicas.
  
  
  RESULTS
  After 3.5 years, six large SureFil and two Spectrum restorations had failed from bulk fracture and secondary caries, resulting in cumulative survival rates of 81.3 and 92.0 percent, respectively. Failed SureFil restorations generally were larger than the remaining intact restorations. Other ratings were satisfactory, with no significant differences between the two materials for any restoration parameter. Alfa ratings for both materials were approximately 80 percent or greater for marginal discoloration, anatomical form, surface texture and surface staining. Lower percentages of restorations were rated Alfa for color match, marginal integrity and gingival health. No postoperative sensitivity was reported. Net mean occlusal wear (+/- standard deviation) was 28.9 (+/- 32.9) micrometers for SureFil and 33.8 (+/- 29.6) microm for Spectrum restorations; the difference was not statistically significant.
  
  
  CONCLUSIONS
  When used with a self-etch adhesive, the 3.5-year clinical performances of both composites were similar and satisfactory for the restoration of Class I and moderate-sized Class II cavities. Clinical Implications. The two composites placed in this study have an increased risk of bulk fracture when placed in large intracoronal Class II molar preparations.
authors.affiliation: Faculty of Dentistry, The University of Hong Kong, SAR, PR China.
authors.forename: Eric C M
authors.initials: EC
authors.lastname: Poon
authors.forename: Roger J
authors.initials: RJ
authors.lastname: Smales
authors.forename: Kevin H K
authors.initials: KH
authors.lastname: Yip
mesh_terms: D000134:Acid Etching, Dental / Q000379:methods; D000328:Adult; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003731:Dental Caries / Q000209:etiology; D018772:Dental Marginal Adaptation; D019232:Dental Restoration Failure; D019554:Dental Restoration Wear; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods*; D005500:Follow-Up Studies; D005884:Gingival Hemorrhage / Q000209:etiology; D006801:Humans; D013499:Surface Properties
chemical_list: D003188:Composite Resins; C403464:SureFil packable composite; C467914:TPH spectrum