Browsing by Author "Schmidt, Alexandra"

This in-vitro study aimed to analyse the effect of brushing and different brushing parameters (kind of toothpaste, kind of toothbrush, brushing force) on erosive tooth wear of primary bovine enamel and dentin. Specimens were prepared from primary bovine enamel or dentin (each group n = 12) and cyclically eroded (6 × 60 s/d, citric acid, pH 2.4) and brushed with children's toothbrushes (2 × 15 s/d) over 5 days. The brushing parameters under investigation were: toothpaste (fluoridated, fluoride-free), toothbrush (manual; rotating-oscillating and sonic, each at two different activation modes) and brushing force (1 N, 2 N). Specimens that were only eroded and not brushed served as controls. Enamel and dentin wear was quantified using widefield confocal microscopy. Statistical analysis was performed using three-and one-way ANOVAs followed by Scheffe's (enamel) or Tamhane's (dentin) post-hoc tests (p < 0.05). Brushing with the fluoridated toothpaste was able to significantly reduce erosive wear in enamel (by 15 to 37%, 6 of 10 groups) and in dentin (by 58 to 72%, all groups), while brushing with the fluoride-free toothpaste was not different from the controls. Considering the kind of toothpaste and brushing force, slight differences between the toothbrushes were observed in enamel, but not in dentin. Within the same toothbrush and activation mode, almost no differences between 1 and 2 N brushing force were detected. In conclusion, erosive tooth wear on primary bovine dental hard tissue mainly depends on the kind of toothpaste, rather than on the kind of toothbrush and the brushing force.

This in vitro study aimed to analyse the effect of various children’s toothpastes on erosive tooth wear of primary bovine enamel and dentin. Enamel and dentin specimens (n = 12) were cyclically eroded (6 × 60 s/d, citric acid, pH 2.4) and brushed (2 × 15 s/d, 2 N) over 5 days. Nine fluoride toothpastes (500 to 1450 ppm) and eight toothpastes containing no fluoride or other active ingredients (hydroxyapatite and/or xylitol) were tested. Unbrushed specimens served as control. Tissue loss was quantified using widefield confocal microscopy and statistically analysed using two-way and one-way ANOVAs followed by Scheffe’s (enamel) or Tamhane’s (dentin) post-hoc tests (p < 0.05). Only one fluoride toothpaste (1400 ppm) was able to reduce erosive wear of enamel significantly by 15% compared to the control (padj. = 0.002). All fluoridated toothpastes reduced dentin surface loss significantly by 32 to 69% compared to the control (padj. ≤ 0.001), while fluoride-free toothpastes were unable to reduce dentin loss significantly (padj. ≥ 0.971). Most fluoridated toothpastes caused less erosive wear compared to fluoride-free toothpastes. Children toothpastes containing fluoride were more effective in reducing erosive wear compared to toothpastes containing no fluoride or other active ingredients.

Ziel dieser In-vitro-Studie war es, den Einfluss von Kinderzahnpasten auf erosiven Zahnhartsubstanzverlust von bovinem Schmelz und Dentin der ersten Dentition zu untersuchen. Bovine Schmelz-und Dentinprüfkörper wurden einem 5-tägigen Erosionsexperiment unterzogen, wobei sie 6-mal täglich erodiert (Zitronensäure, pH 2,4, 60 s) und zwischenzeitlich in künstlichem Speichel gelagert wurden. Zweimal täglich wurden die Prüfkörper mit einer von 17 untersuchten Zahnpasten in einer Zahnputzmaschine gebürstet. Die Prüfkörper der Kontrollgruppen wurden nur erodiert und nicht gebürstet. Der Schmelz- bzw. Dentinverlust wurde mittels Weitfeld-Konfokalmikroskopie gemessen und statistisch mittels ANOVAs (Analysis of Variance) ausgewertet. Im Schmelz führte nur die Anwendung einer der untersuchten fluoridierten Zahnpasten zu einer Reduktion des Zahnhartsubstanzverlustes im Vergleich zur Kontrolle. Allerdings führten die meisten fluoridhaltigen Zahnpasten zu einem geringeren Zahnhartsubstanzverlust im Vergleich zu nicht fluoridierten Zahnpasten. Im Dentin führten alle fluoridhaltigen Zahnpasten zu einer Reduktion des erosiven Zahnhartsubstanzverlustes im Vergleich zur Kontrolle, während die fluoridfreien Zahnpasten keinen protektiven Effekt aufwiesen. Zusammenfassend lässt sich feststellen, dass fluoridhaltige Zahnpasten auch im Sinne der Prävention von erosiven Zahnhartsubstanzverlusten empfohlen werden können.