Effect of Curing Method and Storage Condition on Fluoride Ion Release from a Fluoride-releasing Resin Cement

Abstract

INTRODUCTIONFluoride-containing restorative materials have been developed in a bid to prevent recurrent caries. Glass ionomer cements （GICs） are considered to be bioactive materials with a therapeutic action due to continuous fluoride release over extended periods of time 1） . The caries prophylactic effect of GIC is attributed to the latter's discharge of fluoride ions and the subsequent fluoride uptake by enamel and dentin. It is also known that fluoride ions can inhibit the adherence of bacteria or bacterial growth 2）. Recently, fluoride has been incorporated into resin composites and adhesive systems -which have shown secondary caries inhibition in in vitro 3） and in vivo 4） studies. A research study 5） on fluoride release from conventional GIC, resin-modified GIC, compomer, and composite resin materials has been published. It has been found that the quantity of fluoride ions released from fluoride-releasing resin composites is significantly lower than that from GICs and compomers Riding on the increased use of esthetic restorations, resin cements are also extensively used and marketed because of their esthetic advantage. Recently, a fluoride-releasing resin cement has been developed and marketed, which is expected to inhibit secondary caries formation around indirect restorations. However, there is little information on the amount of fluoride release from a fluoride-releasing resin cement under different solutions and curing methods.The purpose of this study, therefore, was to measure the amount of fluoride released from a fluoride-releasing resin cement under different conditions. The hypothesis was that both curing method and storage condition would affect the amount of fluoride release from the resin cement. MATERIALS AND METHODS Materials used in this studyThe materials, manufacturers, and batch numbers used in this study are listed in The purpose of this study was to evaluate fluoride ion release from a resin-modified glass ionomer cement（Fuji IILC improved, FLC）and a fluoridated resin cement（Panavia F, PF）following different curing methods and storage conditions. The specimens, which were either light-cured（LC）or chemical-cured（CC） , were stored in either distilled water（DW）or demineralizing solution（DS; pH 4.5）for 1, 3, 7, 15, 30, 60, and 90 days. Fluoride ion release was measured using a fluoride ion-specific electrode. Data（n＝5）were statistically analyzed using one-and three-way ANOVA（p＝0.05） . A "burst effect " was observed in the first week from both materials. However, fluoride ion release from FLC was seven times higher than that from PF. Storage in demineralizing solution accelerated the amount of fluoride release from both materials. In addition, LC yielded a lower amount of fluoride ion release from both materials, as compared to CC. It was concluded that both curing mode and storage medium influenced the amount of fluoride release from the tested materials.

Resin-modified Glass-ionomer Setting Reaction Competition

“…With various protocols, VLC has affected diametral tensile strength (Li et al, 1995), water uptake (Jevnikar et al, 1997), wear rates (de Gee et al, 1998), fluoride release (Yoda et al, 2006), and erosion and compressive strength (Hegarty and Pearson, 1993), whereas bracket enamel bond strength was not affected (Ando et al, 2001). Although potentially deleterious, perhaps some properties, such as fluoride release, may be optimized, depending upon acid-base vs. resin-like character in the RMGI.…”

Effect of Simulated Tooth Temperature on the Degree of Conversion of Self-adhesive Resin Cements Exposed to Different Curing Conditions

“…18 Also, high polymerization rates enhance cross-link density and network quality, 30 resulting in a reduction of resin matrix permeability for fluoride ion release from the SARC. 31,32 As a consequence, SARCs polymerized at tooth temperature may release fewer fluoride ions than they do at room temperature, so the clinical benefits of fluoride release may be compromised as well. Conversely, the consequent high DC may improve mechanical properties.…”

Influence of FCP-COMPLEX on bond strength and the adhesive–artificial caries-affected dentin interface

“…Recently, fluoride has been incorporated into adhesive systems to prevent the development of secondary caries around restorations 12,13) . The presence of fluoride in an adhesive contributes significantly to preventing secondary caries, and does not interfere with dentinadhesive bond strength 14) .…”