title: Microleakage of seven adhesive systems in enamel and dentin.
abstract: OBJECTIVE
  The aim of this study was to evaluate the microleakage of seven adhesive systems on two substrates (enamel and dentin).
  
  
  METHODS
  Class V cavities were performed in buccal and lingual surfaces of 56 bovine incisors. The cervical margin was located in dentin and the incisal margin in enamel. The specimens were randomly divided into seven groups (n=16), according to the adhesive system employed: Single Bond; Excite; One Step Plus; Gluma One Bond; Magic Bond; One Up Bond F; and One Coat Bond. The cavities were incrementally filled with a hybrid composite Filtek Z250 and polymerized with a XL 3000 light curing unit. After polishing, the specimens were submitted to thermal cycling followed by dye immersion. Leakage was evaluated under magnification (40X) based on a standard ranking. Data were subjected to statistical analysis (Kruskal-Wallis).
  
  
  RESULTS
  Enamel margins exhibited lower leakage than dentin margins (p<0.01). The majority of the specimens were leakage-free and materials performed similarly. Conversely, in dentin most of the specimens exhibited the highest leakage degree and significant differences among materials (p<0.05) were found, with Excite exhibiting the lowest leakage degree. It was concluded enamel provided better sealing and the adhesive system was a significant factor only in dentin.
authors.affiliation: Federal University of Pelotas, Pelotas, RS, Brazil. araujo.cs@pop.com.br
authors.forename: Camila
authors.initials: C
authors.lastname: Silveira de Araújo
authors.forename: Thiago
authors.initials: T
authors.lastname: Incerti da Silva
authors.forename: Fabricio Aulo
authors.initials: FA
authors.lastname: Ogliari
authors.forename: Sonia Saeger
authors.initials: SS
authors.lastname: Meireles
authors.forename: Evandro
authors.initials: E
authors.lastname: Piva
authors.forename: Flávio Fernando
authors.initials: FF
authors.lastname: Demarco
mesh_terms: D000269:Adhesives; D000818:Animals; D002417:Cattle; D003188:Composite Resins; D001840:Dental Bonding; D003737:Dental Cavity Preparation; D003743:Dental Enamel; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D003804:Dentin; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D008422:Materials Testing; D011897:Random Allocation; D019279:Resin Cements; D016369:Smear Layer; D018709:Statistics, Nonparametric
chemical_list: D000269:Adhesives; D003188:Composite Resins; D017220:Dentin-Bonding Agents; C444701:Filtek Z250; D019279:Resin Cements