Abstract

This study aimed to determine the mechanical properties of fluoride-releasing dental materials after an accelerated fluoride recharge/discharge procedure. Two fluoride-releasing glass ionomer types of cement (Ketac Molar Easymix and IonoStar Molar), a resin-modified glass ionomer (Photac Fil Quick Aplicap), and two compomers (Compoglass F and Glasiosite) were used in this study. A total of 30 rectangular specimens and 30 disk specimens of each material were prepared and placed in distilled/deionized water (n = 5). The amount of fluoride released was analyzed from the materials for 7-day discharge, 1st recharge, 7-day discharge, 2nd recharge, and 7-day discharge, and 3rd recharge. The de/pre- and post-recharge fluoride release were measured using an ion chromatography for 24 days. The flexural strength and microhardness of each group were evaluated. The microhardness of all restorative materials showed no significant change (p > 0.05) over the experimental period. The flexural strength properties of the restorative materials did not change within the time of the study. The study showed that the fluoride release/uptake causes no effect on the mechanical and physical properties of dental materials.

Highlights

  • In the 1970s, Wilson and Kent have introduced the dental material “glass ionomer cement” (GICs)

  • This study aimed to find the mechanical properties and fluoride release/recharge or how changes in the mechanical properties can occur after the fluoride release or recharge of five fluoride-releasing dental materials after an accelerated fluoride recharge/discharge procedure

  • This study determined the effect of repetitive fluoride uptake and release on the mechanical properties and fluoride release rates of commercial restorative materials

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Summary

Introduction

In the 1970s, Wilson and Kent have introduced the dental material “glass ionomer cement” (GICs). The rate of fluoride ion released from the GICs and compomers start rapidly and continually reduces at a fast rate after a short set period in an aqueous environment GICs and compomers can absorb fluoride from the environment, in a process called recharging, compensating for the loss of the fluoride ions (PRESTON et al, 2003; BANSAL; BANSAL, 2015). Glass ionomer cements anti-caries efficacy has not shown by the randomized controlled clinical trials, this specification may provide dental materials the capability for lowering the dental caries lesions progression for a long service period. The compensation of lost fluoride ions by the uptake of fluoride ions from the environment allows the dental material to act as a reservoir of fluoride ions (WIEGAND; BUCHALLA; ATTIN, 2007). Topical fluoride agents can be used for recharging the materials. This recharge capacity can change extensively among the different kinds of fluoridereleasing materials (XU; BURGESS, 2003; MARKOVIC; PETROVIC; PERIC, 2008)

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