నైరూప్య

Retentive Strengths of Three Different Commercial Luting Cements on Metallic Substrate: An In Vitro Study

Rakan Siraj Alsulaimani, Mohmmed M Alabbadi, Abdulmalek S Abunayan and Haneef R Sherfudhin

The aim of this study was to evaluate the tensile bonding strengths of Fleck’s® zinc phosphate cement, Nexus™ RMGI (resin-modified glass ionomer) luting cement, and RelyX™ Ultimate adhesive resin cement on metallic crowns after thermocycling. Methods: Thirty extracted mandibular first molars with minimal caries and restoration were prepared to receive full metal crowns. The teeth were divided into 3 groups (n=10 each) based on the cement used. The cementation procedures were done following the manufacturers’ instructions for all the specimens, and the teeth were stored for 72 hours at room temperature. The prepared teeth with the cemented crowns were immersed in the thermocycling unit for 48 hours; then, the tensile bonding strength was measured using an Instron testing machine. A one-way analysis of variance was used to test for differences among the three groups at a P-value ≤ 0.05. Results: There was a significant difference (P=0.000) between the groups. The RelyX™ Ultimate cement had the strongest retentive force, and detachment occurred at a tensile force of 401.5 N. The Nexus™ RMGI cement had the lowest retentive effect and detachment occurred at an average tensile force of 133.7 N. The retentive strength of the Fleck’s® cement was in the middle and detachment occurred at 244.5 N. Conclusion: Within the study limitations, the RelyX™ Ultimate cement was the most retentive cement for the metallic crowns.

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