Comparison of the Bond Strength of Primary Molar Bands to Zirconia and Stainless-Steel Crowns Following Sandblasting and Application of Different Cements.

OBJECTIVES: This study compared the bond strength of primary molar bands to zirconia crowns (ZCs) and stainless-steel crowns (SSCs) following sandblasting and application of glass ionomer (GI) and self-adhesive resin cements. MATERIALS AND METHODS: This in vitro study was conducted on 48 monolithic ZCs and 48 primary mandibular second molar SSCs mounted in auto-polymerizing acrylic resin in cylindrical molds. Orthodontic wire was used to create a 70-mm U-shaped loop soldered to the mid-buccal and mid-lingual surfaces perpendicular to the occlusal surface. The specimens were assigned to 8 groups for the bonding of sandblasted and non-sandblasted bands to SSCs and ZCs with GI and self-adhesive resin cement. After the interventions and incubation in artificial saliva at 37°C for 24 h, the specimens were thermo-cycled (5000 cycles), and their bond strength was measured in a universal testing machine (1 mm/minute). Data were analyzed by three-way ANOVA (alpha = 0.05). RESULTS: The bond strength was the highest in the sandblasted band bonded to SSC with resin cement and the lowest in the non-sandblasted band bonded to ZC with GI. Irrespective of crown type, resin cement yielded a significantly higher bond strength than GI (p  < 0.001). Also, irrespective of crown and cement type, sandblasting significantly increased the bond strength (p  = 0.004). CONCLUSION: The bond strength provided by resin cement was significantly higher than GI cement. Sandblasting of the band significantly increased the bond strength, but the effect of crown type on the bond strength was not significant.