Abstract
Objective This study aimed to evaluate the effects of different toothpastes on the surface wear of enamel, dentin, composite resin (CR), and resin-modified glass ionomer cement (RMGIC), and to perform a topographic analysis of the surfaces, based on representative images generated by atomic force microscopy (AFM) after erosion-abrasion cycles.Methodology One hundred and forty bovine incisors were collected and divided into two groups: 72 enamel and 72 dentin blocks (4×4 mm). Half of the specimens were restored with CR (Filtek Z350 XT) and the other half with RMGIC (Fuji II LC). Then, samples were submitted to a demineralization cycle (5 days, 4×2 min/day, 1% citric acid, pH 3.2) and exposed to three different toothpastes (2×15 s/day): without fluoride (WF, n=12), sodium fluoride-based (NaF, n=12), and stannous fluoride-based (SnF2, n=12). Surface wear, as well as restoration interfaces wear, were investigated by profilometry of the dental substrates and restorative materials. All representative surfaces underwent AFM analysis. Data were analyzed by two-way analysis of variance and Tukey’s tests (α=0.05).Results NaF-based toothpaste caused the greater dentin surface wear (p<0.05). Toothpastes affected only enamel-restoration interfaces. AFM analysis showed precipitate formation in dentinal tubules caused by the use of fluoride toothpastes.Conclusions NaF-based toothpastes had no protective effect on enamel adjacent to CR and RMGIC against erosion-abrasion challenges, nor on dentin adjacent to RMGIC material. SnF2-based toothpastes caused more damage to interfaces between enamel and RMGIC.
Highlights
The number of patients with erosive tooth wear (ETW) has increased during recent years, raising clinical concern.1 ETW is the loss of dental substrate caused by physical force, such as toothbrushing, and exposure to acids present in the oral cavity.1,2 These acids may either derive from external sources – as fruit juices and soft drinks, which are rich in citric acid, – or from internal sources – as gastroesophageal reflux – and may damage dental substrates over time.2-4 ETW treatment relies on strategies to improve dental tissues resistance against erosion and, when necessary, on the use of restorative treatments.5,6 Composite resins (CR) and resin-modified glass ionomer cements (RMGIC) are often applied in restoration.7 they are susceptible to erosive acids action, which may decrease their clinical effectiveness and longevity
This study aimed to evaluate the effects of different toothpastes on the surface wear of enamel, dentin, composite resin (CR), and RMGIC after erosion-abrasion cycles
Statistical analyses were performed using Sigma Plot 12.5 software
Summary
ETW is the loss of dental substrate caused by physical force, such as toothbrushing, and exposure to acids present in the oral cavity.. ETW is the loss of dental substrate caused by physical force, such as toothbrushing, and exposure to acids present in the oral cavity.1,2 These acids may either derive from external sources – as fruit juices and soft drinks, which are rich in citric acid, – or from internal sources – as gastroesophageal reflux – and may damage dental substrates over time.. Composite resins (CR) and resin-modified glass ionomer cements (RMGIC) are often applied in restoration.. Composite resins (CR) and resin-modified glass ionomer cements (RMGIC) are often applied in restoration.7 They are susceptible to erosive acids action, which may decrease their clinical effectiveness and longevity.
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