title: Bonding values of two contemporary ceramic inlay materials to dentin following simulated aging.
abstract: OBJECTIVE
  To compare the push-out bond strength of feldspar and zirconia-based ceramic inlays bonded to dentin with different resin cements following simulated aging.
  
  
  METHODS
  Occlusal cavities in 80 extracted molars were restored in 2 groups (n=40) with CAD/CAM feldspar (Vitablocs Trilux forte) (FP) and zirconia-based (Ceramill Zi) (ZR) ceramic inlays. The fabricated inlays were luted in 2 subgroups (n=20) with either etch-and-bond (RelyX Ultimate Clicker) (EB) or self-adhesive (RelyX Unicem Aplicap) (SA) resin cement. Ten inlays in each subgroup were subjected to 3,500 thermal cycles and 24,000 loading cycles, while the other 10 served as control. Horizontal 3 mm thick specimens were cut out of the restored teeth for push out bond strength testing. Bond strength data were statistically analyzed using 1-way ANOVA and Tukey's comparisons at α=.05. The mode of ceramic-cement-dentin bond failure for each specimen was also assessed.
  
  
  RESULTS
  No statistically significant differences were noticed between FP and ZR bond strength to dentin in all subgroups (ANOVA, P=.05113). No differences were noticed between EB and SA (Tukey's, P>.05) bonded to either type of ceramics. Both adhesive and mixed modes of bond failure were dominant for non-aged inlays. Simulated aging had no significant effect on bond strength values (Tukey's, P>.05) of all ceramic-cement combinations although the adhesive mode of bond failure became more common (60-80%) in aged inlays.
  
  
  CONCLUSIONS
  The suggested cement-ceramic combinations offer comparable bonding performance to dentin substrate either before or after simulated aging that seems to have no adverse effect on the achieved bond.
authors.affiliation: Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia.; Department of Crown and Bridge, Faculty of Dentistry, Tanta University, Tanta, Egypt.
authors.forename: Ashraf Abdelfattah
authors.initials: AA
authors.lastname: Khalil
authors.affiliation: Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha, Saudi Arabia.
authors.forename: Khalid Mohamed
authors.identifier: 0000-0003-2904-3250
authors.initials: KM
authors.lastname: Abdelaziz
keywords: Bonding; Ceramics; Dentin; Inlays; Resin cement
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