Brushing Abrasion of Eroded Dentin after Application of Sodium Fluoride Solutions

Abstract

The aim of the present in vitro study was to evaluate the influence of sodium fluoride solutions on brushing abrasion of eroded dentin. Dentin specimens were prepared from 60 bovine incisors. The specimens were embedded in acrylic resin, ground flat, polished and subsequently covered with tape exposing an area of 1.8 mm × 10.0 mm in the center of the exposed dentin. The samples were alternatingly stored in a demineralizing solution (5 min) and a remineralizing solution (1 min) for 5 times. The erosive soft drink Sprite light® served as a demineralizing solution and artificial saliva was used as a remineralizing solution. Prior to storage in artificial saliva 15 specimens were each treated for 1 min with 250 and 2,000 ppm fluoride solution, respectively. Fifteen specimens were treated with distilled water instead of the fluoride solution (= eroded controls). The remaining samples were neither eroded with the soft drink nor fluoridated (= uneroded controls). After each immersion in artificial saliva the specimens were submitted to abrasion in a toothbrushing machine. After 5 demineralization-remineralization brushing cycles the total amount of tooth wear due to erosion and subsequent abrasion was profilometrically evaluated. Statistical analysis revealed the significantly lowest wear in the uneroded controls and the highest amount of abrasion in the eroded controls. Application of the fluoride solutions increased the wear resistance of the eroded dentin specimens, showing significantly better protection by the high-concentration compared to the low-concentration solution. The susceptibility to abrasion of the eroded dentin specimens treated with the high-concentration fluoride solution did not differ significantly from the uneroded dentin samples. It is concluded that application of 2,000 ppm sodium fluoride solutions immediately before toothbrushing significantly reduces abrasion of eroded dentin in vitro.

Influence of toothbrushing on enamel softening and abrasive wear of eroded bovine enamel: an in situ study

“…Studies have shown that beverage modification, salivary stimulation by a chewing-gum and consumption of cheese or milk after the acid attack could decrease erosion 12,16,19 . Other studies have demonstrated that using fluoride mouth rinses before brushing procedures, or waiting at least one hour to brush the teeth after an erosive challenge, could decrease the enamel wear 4,5,7,15,18,21 . However, further studies should be conducted to establish preventive measures to decrease alterations by eroded enamel subjected to abrasion.…”

“…After that, no treatment was performed in one row (GI), whereas the other row (GII) was immediately brushed by the volunteers ( Figure 1K). The brushing procedure consisted of 30 extraoral brushing strokes with a soft end-rounded toothbrush (Bitufo; Sanifil, Jundiaí, SP, Brazil) with a small portion (approximately 0.3 g) of the dentifrice without fluoride (Crest  , pH 6.8, silica as abrasive) 7 . Volunteers were trained and instructed to carefully perform this procedure and to avoid a carry-across effect of the treatments.…”

Abrasion of eroded dentin caused by toothpaste slurries of different abrasivity and toothbrushes of different filament diameter

“…Although it was shown that the organic matrix of dentin exposed during prolonged acidic challenges is resistant to brushing treatment to some extent, 2 several studies showed that brushing treatment increased the loss of eroded dentin. [3][4][5] Toothbrushing abrasion is significantly related to the abrasivity of the toothpaste. This has been shown for sound dental hard tissues [6][7][8] and, in a few studies, also for eroded enamel and dentin.…”

Combined Influence of Fluoride and Biofilms on the Biotribocorrosion Behavior of Titanium Used for Dental Applications

“…These compounds are supposed to protect metal surfaces from wear by the formation of metal fluorides through tribochemical reactions. Moreover, fluoride has also been shown to reduce in vitro and in situ tooth wear [39][40][41][42][43][44]. The anti-wear action of fluoride seems to improve at increasing concentrations of sodium fluoride (NaF) and lower pHs [41,44,45].…”