Research Article Open Access

Effect of Pre-Treatment with CPP-ACP on Shear Bond Strength of Glass Ionomer Restorative Materials to Primary Teeth

Abstract

Background: Considering desirable characteristics of glass ionomer materials for primary teeth restorations, this study aimed to compare the bond strength of conventional and Nano resins modified glass ionomer restoratives to the primary teeth dentin and evaluate the effect of pretreatment with CPP-ACP paste on their shear bond strength.

Materials and methods: Sixty freshly extracted primary molar teeth were selected. A flat dentinal surface was exposed using a fissure but followed by silicon carbide papers polishing. The specimens were randomly divided into four groups (n=15) based on the materials used (Fuji II LC; GC or Ketac Nano-100; 3M/ESPE) with or without surface pretreatment using CPP-ACP paste. The specimens were prepared and stored in distilled water at 37°C for 24 hours; Shear Bond Strength (SBS) test was performed and calculated using the relevant formula. Data were analyzed using one-way ANOVA and post-hoc LSD test.

Results: A statistically significant difference between different groups of the study was seen (P=0.007). Post-hoc test showed that group II (Ketac N 100 with CPP-ACP) had statistically higher mean SBS values than the groups III and IV and no statistical was found between two RMGIC restorative materials (P=0.07). Pretreatment with CPP-ACP did not significantly affect the SBS of either Ketac Nano-100 (P=0.57) or Fuji II LC (P=0.435).

Conclusion: The SBS of the Ketac Nano-100 and Fuji II LC to the primary teeth dentin was comparable. Pretreatment with CPP-ACP showed no significant effects on the SBS of RMGICs to the primary teeth dentin.

Jyothi Najmeh Mohammadi, Rafat Bagheri, Negar Etminan

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