Ultrastructural evaluation of adverse effects on dentine formation from systemic fluoride application in an experimental mouse model.
animal model
dental fluorosis
dentine hypoplasia
dentinogenesis
Journal
International endodontic journal
ISSN: 1365-2591
Titre abrégé: Int Endod J
Pays: England
ID NLM: 8004996
Informations de publication
Date de publication:
10 Oct 2024
10 Oct 2024
Historique:
revised:
12
08
2024
received:
17
06
2024
accepted:
03
09
2024
medline:
10
10
2024
pubmed:
10
10
2024
entrez:
10
10
2024
Statut:
aheadofprint
Résumé
Fluoride is widely used in dentistry for its caries prevention. To reduce dental caries, the optimal fluoride concentration of public water supplies in the United States is 0.7 ppm. However, excessive systemic fluoride consumption can lead to dental/enamel fluorosis. Numerous studies have explored the effects of fluoride on enamel and enamel-forming cells. However, research on systemic fluoride's impact on dentine is limited, particularly the effect of fluoride on the structure of the dentine-pulp complex. Therefore, this study aimed to identify how excessive fluoride affects dentine microstructure using an experimental mouse model. C57BL6/J male mice (6-9 weeks old) were randomized into four groups (Fluoride at 0, 50, 100, or 125 ppm in drinking water) (n = 4/group). Mice were provided water ad libitum for 6 weeks along with fluoride-free food. Thereafter, mandibular incisors were analysed. Enamel phenotypes were evaluated using light microscopy and quantitative light-induced fluorescence (QLF) to measure fluorosis levels. Dentine morphology was evaluated using micro-CT, scanning electron microscopy (SEM), SEM-EDX (energy-dispersive X-ray), microhardness test and histological imaging. Data were analysed using one-way ANOVA with Dunnett's multiple comparisons as a post hoc test and the Kruskal-Wallis test with Dunn's multiple comparisons post hoc test (p < .05). Mice treated with fluoride at 50-125 ppm developed enamel hypoplasia in their erupting incisors and micro-CT imaging revealed that fluoride 125 ppm caused external resorption of the growing incisor. Dentine mineral density, dentine volume decreased compared with the 0 ppm control, while pulp volume increased compared with the 0 ppm control group. SEM showed wider predentine layer and abnormalities in calcified matrix vesicles derived from odontoblasts in fluoride 100 and 125 ppm groups. Vickers microhardness of dentine significantly decreased in the high-dose group. Fluoride-induced dentine hypoplasia in a dose-dependent manner. Histological evaluation showed excessive fluoride 125 ppm induced micro abscess formation and inflammatory cell infiltration. Fluoride induced dentine dysplasia with a dentine microstructure resembling hypophosphatasia. High doses of systemic fluoride can cause dentine dysplasia. Both three-dimensional and microstructural analyses showed the structural, chemical and mechanical changes in the dentine and the mineralized tissue components, along with external resorption and pulp inflammation.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : JSPS KAKENHI
ID : 21K09915
Organisme : NIDCR NIH HHS
ID : K02DE029531
Pays : United States
Organisme : NIGMS NIH HHS
ID : T34 GM145509
Pays : United States
Organisme : NIDCR NIH HHS
ID : R01 DE027648
Pays : United States
Organisme : The National Institute of General Medical Sciences
ID : 1T34GM145509-01A1
Organisme : NIDCR NIH HHS
ID : K02 DE029531
Pays : United States
Organisme : NIDCR NIH HHS
ID : R01DE027648
Pays : United States
Informations de copyright
© 2024 British Endodontic Society. Published by John Wiley & Sons Ltd.
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