Shear Bond Strength of Zirconia Ceramic to the Primary Tooth Dentin

Abstract

Background: There is no information about the shear bond strengths (SBS) of zirconia ceramic to primary tooth dentin. Aim: To investigate the effect of different surface treatments and cements on the shear bond strength (SBS) of zirconia ceramic to primary tooth dentin. Materials and Methods: Prepared zirconia bars were distributed into four groups according to surface treatment procedure: control, sandblasting, CoJet and hot etching. The zirconia specimens in each group were further divided into subgroups according to cement (n = 13): self‑adhesive resin (Rely‑X Unicem), resin‑modified glass ionomer (Ketac‑Cem Plus), and universal bioactive (BioCem). Zirconia specimens were bonded to the primary tooth dentin surface by cement. SBS was measured, and the data were subjected to two‑way ANOVA and Tukey’s tests. Results: Statistical differences were observed in the surface treatment procedures for Rely‑X Unicem (P < 0.05), but no statistically significant differences were found in the sandblasting, CoJet and hot‑etching groups for Ketac‑Cem Plus (P > 0.05). For BioCem, the SBS value for the hot etching group was significantly lower than those for the CoJet and sandblasting groups (P < 0.05). The SBS values for the Rely‑X Unicem subgroups (sandblasting, CoJet and hot etching) were significantly higher than those for the other cements (P<0.05). Conclusion: The bond strength of zirconia ceramic to primary tooth dentin is affected by surface treatments and cements.