title: Marginal sealing of a porcelain  laminate veneer luted with  three different resin cements  on fluorosed teeth.
abstract: OBJECTIVE
  The purpose of this study was to investigate the sealing ability of three different resin cements for the luting of a porcelain laminate veneer (PLV) to the enamel and dentin of fluorosed teeth.
  
  
  METHODS
  Thirty incisors with moderate fluorosis according to the Thylstrup-Fejerskov Index (TFI = 4 to 6) received a veneer preparation with dentin margins at the gingival third. The IPS Empress (Ivoclar Vivadent) veneers were luted to the teeth of three groups (n = 10) using three different resin cements: Group 1: Excite DSC/Variolink II - etch-and-rinse (E&R), Group 2: ED Primer II/Clearfil Esthetic - self-etch (SE), Group 3: RelyX Unicem - self-adhesive (SA). After 24 h of water storage and thermocycling, marginal microleakage was evaluated on three slices from each tooth using the dye penetration technique under a digital microscope.
  
  
  RESULTS
  Data (microleakage percentage over the entire preparation length) were analyzed using the Kruskal-Wallis and Mann-Whitney tests (P < 0.05). Mean microleakage percentage was 0.8% to 18% at the enamel and dentin margins, respectively. On the enamel, Group 1 (E&R) exhibited significantly less microleakage compared to Groups 2 (SE; P = 0.03), and 3 (SA; P = 0.005). On the dentin, microleakage in Group 3 (SA) was significantly less than that in Groups 1 (E&R, P = 0.001), and 2 (SE; P = 0.03). The difference between the latter two groups was significant, with Group 1 (E&R) exhibiting the greatest microleakage.
  
  
  CONCLUSIONS
  The best enamel and dentin sealing of the cemented veneers was obtained with the E&R and SA luting agents, respectively.
authors.forename: Fereshteh
authors.initials: F
authors.lastname: Shafiei
authors.forename: Mahtab
authors.initials: M
authors.lastname: Memarpour
authors.forename: Zahra
authors.initials: Z
authors.lastname: Jowkar
mesh_terms: D000328:Adult; D003776:Dental Porcelain; D003801:Dental Veneers; D006801:Humans; D019279:Resin Cements; D014070:Tooth / Q000601:surgery*; D055815:Young Adult
chemical_list: C465120:Dental Seal; D019279:Resin Cements; D003776:Dental Porcelain