Correlation Between Fluoride Release, Surface Hardness and Diametral Tensile Strength of Restorative Glass Ionomer Cements

Overview

Journal J Clin Exp Dent

Specialty Dentistry

Date 2024 Jul 11

PMID 38988758

Authors

Mariana Pardi

Bruna-Mandra da Cunha

Heitor-Monteiro-Mundim Cunha

Manoela-Borges E Souza Marques

Kaio-Luca-Gimenes Ribeiro

Carlos-Eduardo-Ferreira Cruz

Carla-Regina Costa

Cesar-Penazzo Lepri

Denise-Tornavoi de Castro

Affiliations

Soon will be listed here.

Abstract

Background: The aim of this study was to determine if there is a correlation between fluoride release, surface hardness, and diametral tensile strength of restorative glass ionomer cements (GICs).

Material And Methods: Conventional (Riva Self Cure) and resin-modified (Riva Light Cure) GICs were used. Thirty-four samples (ø 6 x 3 mm) were prepared for each cement. The kinetics of fluoride release (n=4) was evaluated over 28 days using a fluoride-selective electrode (ISE 4010-C00). The analysis of surface hardness (n=10) was performed using a microhardness tester (Shimadzu HMV-2000, Japan) with a Knoop indenter and a load of 25 gf for 30 seconds. The diametral tensile strength test (n=10) was conducted on a universal testing machine at a speed of 0.75 mm/min. Fluoride release data were analyzed by two-way repeated measures ANOVA and Bonferroni post hoc test, while independent t-test was used for other analyses (α=0.05).

Results: Overall, the groups showed higher fluoride release until day 7 and a progressive decrease until day 28. On day 1 and day 21, Riva Self Cure showed a higher level of release than Riva Light Cure (=0.026). Riva Light Cure showed higher diametral tensile strength (<0.0001) and surface hardness (=0.034) than Riva Self Cure. A negative correlation was found, indicating that higher fluoride release is associated with lower surface hardness and diametral tensile strength.

Conclusion: Fluoride release and mechanical performance are related properties of GICs, and these properties exhibit different values depending on the type of material. Resin-modified GIC release less fluoride but exhibit better mechanical performance compared to conventional GIC. Diametral Tensile Strength, Fluoride, Glass Ionomer Cement, Surface Hardness.

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