# A Comparative Evaluation of Marginal Leakage and Shear Bond Strength of Cention N, Resin-Modified Glass Ionomer Cement (RMGIC), and Conventional Glass Ionomer Cement (GIC): An In Vitro Study

## TL;DR

This study compares the performance of three dental filling materials and finds that Cention N performs best in terms of durability and sealing ability.

## Contribution

The study introduces a direct in vitro comparison of marginal leakage and dentin bond strength among Cention N, RMGIC, and GIC.

## Key findings

- Cention N exhibited the least marginal leakage among the tested materials.
- Cention N showed the highest dentin shear bond strength compared to RMGIC and GIC Type IX.

## Abstract

Aim: 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).

Methods: 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).

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

Conclusion: 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.