Abstract
BackgroundRecently, incorporation of nanohydroxyapatite (NHA) has been suggested to improve the mechanical properties of glass ionomers (GIs). This study aimed to assess the effect of addition of NHA on wear of resin modified glass ionomer (RMGI) by tooth brushing simulation.Material and MethodsIn this in vitro, experimental study, NHA in 1, 2, 5, 7 and 10wt% concentrations was added to Fuji II LC RMGI powder, and 48 samples (5×5mm) in five experimental and one control group (n=8) were fabricated. After polishing, cleaning and incubation at 37°C for three weeks, the samples were weighed and subjected to tooth brushing simulation in a toothpaste slurry according to ISO14569-1. Then, they were weighed again and the weight loss was calculated. The data were analyzed using one-way ANOVA and Tukey’s test.ResultsThe highest and the lowest weight loss was found in the 0% NHA (-1.052±0.176) and 5% NHA (-0.370±0.143) groups, respectively. Wear was significantly higher in 0% NHA group (P<0.05). No difference was detected in wear between 2 and 5wt% NHA or among 1, 7 and 10wt% NHA groups. Significant differences were noted in wear between 2 and 5wt% NHA and 1, 7 and 10wt% NHA groups (P<0.001).ConclusionsIncorporation of up to 10wt% of NHA increases the wear resistance of Fuji II LC RMGI. This increase was the highest when 2 and 5wt% NHA were added. Key words:Glass ionomer, hydroxyapatites, nanoparticles, dental restoration wear.
Highlights
Glass ionomer is a tooth-colored restorative material with extensive applications in dentistry [1] Success and longevity of tooth-colored restorations generally depend on the quality of the seal of cavity walls by the bonded restorative material [2]
The highest mean weight loss occurred in 0% NHA group (-1.052%±0.176) and the lowest mean weight loss occurred in 5wt% group (-0.370±0.143)
The resin modified glass ionomer (RMGI) are used in patients with high risk of caries due to their fluoride release potential and chemical and micromechanical bond to tooth structure [21]
Summary
Glass ionomer is a tooth-colored restorative material with extensive applications in dentistry [1] Success and longevity of tooth-colored restorations generally depend on the quality of the seal of cavity walls by the bonded restorative material [2]. Ty, fluoride release, thermal expansion near to the tooth structure, radiopacity, preventing demineralization, and enhancing remineralization They have some limitations as well including brittleness, low mechanical properties, long-term setting time, rough surface texture, low fracture toughness and low wear resistance, which limit their clinical use [4,5]. Needle-shaped NHA particles are added to restorative materials since they have optimal biological properties [18] They provide higher surface area due to smaller size of particles and have higher surface charge, which improves the strength and facilitates the use of glass ionomers [19,20]. This study aimed to assess the effect of incorporation of different weight percentages of NHA on the wear resistance and surface roughness of Fuji II LC RMGI. This study aimed to assess the effect of addition of NHA on wear of resin modified glass ionomer (RMGI) by tooth brushing simulation. This increase was the highest when 2 and 5wt% NHA were added
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