Influence of environmental conditions on properties of ionomeric and resin sealant materials

Abstract

Objectives:The aim of this study was to determine the effect of environmental conditions on the degradation of ionomeric and resin sealant materials.Material and Methods:FluroShield, Vitremer, and Ketac Molar disc-shaped specimens (n=18/material) were prepared, polished, subjected to initial hardness and roughness readings. Six discs of each material were randomly assigned to one of three different storage solutions: 0.3% citric acid (CA), demineralization solution (DE), and remineralization solution (RE). The specimens were individually immersed in 3 mL of the test solutions, which were daily changed. After 15 days of storage, new surface roughness and hardness readings were done. Fluoride release in the solutions was measured within 15 days. Data were analyzed by ANOVA and Tukey's and Contrast tests (α=0.05).Results:The storage in CA increased the roughness of Vitremer and Ketac Molar. A significant reduction in hardness was observed for all materials after storage in all solutions. For all materials, the greatest amounts of fluoride release occurred during the 1st day. FluroShield presented the same patterns of fluoride release in all solutions. Ketac Molar and Vitremer released the highest amounts of fluoride in the CA solution.Conclusions:Ionomeric materials are more susceptible to degradation than resin-based materials under acidic conditions. Acidic conditions lead to a higher fluoride release from ionomeric materials.

Fluoride release and recharging ability of new dental sealants

“…The fluoride release of a fluoride-containing dental material may also be influenced by external variables such as the pH (Kosior and Kaczmarek 2006;Shen et al 2007;Kantovitz et al 2009) and the type of storage media used (Bell et al 1999;Hayacibara et al 2004;Kosior and Kaczmarek 2006). Kosior and Kaczmarek (2006), who investigated the fluoride release from a dental FS after immersion into three different storage media (de-ionized water, saline and artificial saliva) and at different pH (4.5-7.5), concluded that the highest cumulative fluoride release was detected in saline and the lowest in artificial saliva and at neutral pH.…”

Fluoride-releasing dental restorative materials: An update

“…However, under acidic conditions, there is greater likelihood of the fluoride being complexed and not available as free Fions. The reduced pH, with extra H + ions available, may lead to the formation of un-dissociated HF, and the increased release of Al 3+ leads to the possibility of the occurrence of such complexed species as AlF 2+ , AlF 2 +70 or even AlF 4 - 71 . Experimental results with a fluoride ion selective electrode have suggested that under acidic conditions almost all of the fluoride is complexed in some way 22 .…”

Influence of etching time and bonding strategies on the microshear bond strength of self- and light-cured pit-and-fissure sealants

“…With the advent of modern dentistry, preservation of the dental structure and avoidance of surgical treatment have become treatment goals (1,2). In this sense, pit-and-fissure sealants have been recognized as an effective method for preventing caries initiation and arresting caries progression by providing a physical barrier that inhibits microorganisms and food particles from collecting in pits and fissures (3).…”