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. 2022 Dec 31;35(3):229-237.
doi: 10.54589/aol.35/3/229.

Effect of different toothpastes on permeability and roughness of eroded dentin

Fernanda Ss Ramos  1 , Alberto Cb Delbem  1 , Paulo H Dos Santos  2 , Mariana D Moda  1 , André Lf Briso  1 , Ticiane C Fagundes  3
Affiliations

Effect of different toothpastes on permeability and roughness of eroded dentin

Fernanda Ss Ramos et al. Acta Odontol Latinoam. .

Abstract
in English, Portuguese

Dentin hypersensitivity (DH) is characterized by rapid, acute pain arising from exposed dental tubules.

Aim: the aim of this study was to evaluate the roughness, tubule occlusion, and permeability of eroded dentin brushed with different toothpastes.

Materials and method: ninety bovine teeth were cut into blocks. Thirty hemifaces were protected with varnish and the other sixty were submitted to permeability tests. Specimens were divided into groups according to the dentifrices: without fluoride (WF), sodium fluoride (NaF), and stannous fluoride (SnF2). The blocks were subjected to a 5-day erosive-abrasive protocol. Surface roughness and dentinal tubule occlusion (n=10) were assessed for both control and test hemifaces of the same sample along with permeability analysis (n=20). Two-way RM ANOVA and Tukey's post-hoc test were performed (p≤0.05).

Results: NaF and SnF2 presented higher roughness than WF. The number of open tubules was higher in WF. Permeability was higher in SnF2, but there was no significant difference between WF and NaF.

Conclusions: both fluoride toothpastes occluded dentinal tubules and increased roughness. NaF toothpaste promoted greater decrease in dentin permeability.

A hipersensibilidade dentinária (HD) é caracterizada por dor rápida e aguda decorrente de túbulos dentais expostos. Objetivo: este estudo teve como objetivo avaliar a rugosidade, oclusão tubular e permeabilidade da dentina erodida escovada com diferentes dentifrícios. Materiais e Método: noventa dentes bovinos foram seccionados em blocos. Trinta hemifaces foram protegidas com verniz e outras sessenta foram submetidas à permeabilidade. Os espécimes foram divididos em grupos de acordo com os dentifrícios: sem flúor (SF), fluoreto de sódio (NaF) e fluoreto estanoso (SnF2). Em seguida, os blocos foram submetidos a um protocolo erosivo-abrasivo de 5 dias. A rugosidade da superfície e a oclusão do túbulo dentinário (n = 10) foram avaliadas para ambas as hemifaces de controle e teste da mesma amostra, também realizou-se a análise de permeabilidade (n = 20). Two-way RM ANOVA e pós-teste de Tukey foram realizados (p≤0,05). Resultados: NaF e SnF2 apresentaram rugosidade superior ao SF. O número de túbulos abertos foi maior em SF. Não encontramos diferenças significativas entre SF e NaF em relação à permeabilidade; entretanto, SnF2 apresentou maior permeabilidade. Conclusão: ambos os dentifrícios fluoretados foram capazes de ocluir os túbulos dentinários e aumentar a rugosidade. No entanto, o dentifrício NaF promoveu uma maior diminuição da permeabilidade dentinária.

Keywords: dentifrices; dentin desensitizing agents; dentin permeability; tooth abrasion; tooth erosion.

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Conflict of interest statement

The authors declare no potential conflicts of interest regarding the research, authorship, and/or publication of this article.

Figures

Fig. 1
Fig. 1. Flowchart showing the steps followed to analyze roughness and tubule obliteration
Fig. 2
Fig. 2. Flowchart showing the steps followed to analyze dentin permeability
Fig. 3
Fig. 3. Example of Image J software for counting open tubules. Dentin surface on the sound and eroded dentin.A: Tubule count B: WF sound dentin group; C: WF eroded dentin group; D: NaF sound dentin group; E: NaF eroded dentin group; F: SnF2 sound dentin group; G: SnF2 eroded dentin group.
Fig. 4
Fig. 4. Surface roughness analysis (Ra μm) of dentin blocks according to the treatment group and the specimen area (sound and eroded). Different letters (uppercase between groups and lowercase intragroup) indicate statistically significant differences (p<0.05). WF: toothpaste without fluoride. NaF: toothpaste with sodium fluoride. SnF2: toothpaste with stannous fluoride.
Fig. 5
Fig. 5. Dentinal tubules occlusion – SEM evaluation: values of open dentinal tubules, as a percentage of sound and eroded dentin. Different letters (uppercase between groups and lowercase intragroup) indicate statistically significant differences (p<0.05). WF: toothpaste without fluoride. NaF: toothpaste with sodium fluoride. SnF2: toothpaste with stannous fluoride.
Fig. 6
Fig. 6. Dentin permeability according to dentifrice (μl.cm2/min. cm H2O). Different letters (uppercase between groups and lowercase intragroup) indicate statistically significant differences (p<0.05). Lp = dentin permeability. WF: toothpaste without fluoride. NaF: toothpaste with sodium fluoride. SnF2: toothpaste with stannous fluoride.
See this image and copyright information in PMC

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