A Comparative Evaluation of Marginal Leakage and Shear Bond Strength of Cention N, Resin-Modified Glass Ionomer...

This study aimed to compare and evaluate the marginal leakage and dentin shear bond strength (SBS) of Cention N and resin-modified glass ionomer cement (RMGIC), and to compare them with conventional glass ionomer cement (GIC) (GC Fuji IX, GC Corporation, Tokyo, Japan).

For the evaluation of marginal leakage, 30 extracted premolars were randomly divided into three groups. Class I cavities were prepared, and the cavities were restored with Cention N, RMGIC, and GIC Type IX. After thermocycling, the specimens were immersed in 0.5% methylene blue dye for 24 hours. They were then sectioned and examined under a stereomicroscope at 40× magnification for scoring. Data were statistically analyzed using the Kruskal-Wallis and Mann-Whitney U tests. For dentin SBS evaluation, the occlusal surfaces of 30 premolars were ground flat, and cylinders of three restorative materials (n = 10 per group), Cention N, RMGIC, and GIC Type IX, were bonded to the surfaces following the manufacturers' instructions. After 24 hours of storage at 100% humidity, dentin SBS was measured, and fracture modes were assessed under a stereomicroscope at 10× magnification. Data were statistically analyzed using the one-way ANOVA with the least significant difference post hoc test for SBS, and the chi-square test for fracture modes (p < 0.05).

Cention N had the least marginal leakage and highest dentin SBS, followed by RMGIC and GIC type IX.

Cention N showed the least marginal leakage and highest dentin SBS, followed by RMGIC, while GIC Type IX performed the poorest. Thus, Cention N is recommended as a permanent restorative material for better clinical success and longevity.