Biological effects of sodium fluoride varnishes used in remineralisation of enamel: An in vitro study.

AIM: During the last three decades, fluoride varnishes have been recognised as effective strategies for caries prevention in the young-child population and have contributed to a decrease in its prevalence worldwide. The present study aimed to assess in vitro the level of cytotoxicity and genotoxicity in human primary pulp fibroblasts (DPFs) of two NaF varnishes. MATERIALS AND METHODS: Four experimental assays were carried out (MTS, Mitotracker® system [mitochondrial function and morphology], Live/Dead®, and Comet) to assess the morphology, viability, and genotoxicity of two NaF varnishes (Duraphat® and Clinpro White®, both at two different concentrations). The essays were conducted on cultured pulp fibroblasts, grouped in four experimental and two control groups. Collected data were analysed by one-way ANOVA followed by the post hoc Bonferroni test. RESULTS: Some morphological changes of DPFs could be detected after the NaFVs stimulation. Most DPFs incubated in Duraphat (22.6 mg/L) maintained their morphological characteristics, except for a small decrease in cell size and shorter cytoplasmic projections (filopodia); DPFs treated with Clinpro White Varnish (22.6 mg/L) presented a morphology and size similar to the control group. DPFs exposed to Duraphat (113 mg/L) exhibited significant morphological alterations with considerable cell size increases and DPFs treated with Clinpro White Varnish (113 mg/L) showed a slight cell size increase without noticeable morphological anomalies. The Duraphat (22.6 mg/L) and Clinpro White Varnish (22.6 mg/L) groups promoted 31% and 35% cell proliferation, respectively, whereas DPFs proliferation with Duraphat (113 mg/L) decreased up to 59%, and cell proliferation with Clinpro White Varnish (113 mg/L) was similar to that of control. CONCLUSION: All tested varnishes induced changes in the fibroblastic mitochondria. In general, Duraphat was less biocompatible and caused a change in the number of mitochondria compared to Clinpro White Varnish.

The effect of reduced glutathione on the toxicity of silver diamine fluoride in rat pulpal cells.

INTRODUCTION: Due to its ability to arrest untreated dental caries, silver diamine fluoride (SDF) has been advocated for indirect pulp capping procedures. However, the high concentrations of silver and fluoride in SDF raise concerns about its biocompatibility to pulpal tissues. OBJECTIVES: This study aimed to investigate the effect of SDF on the viability, alkaline phosphatase (ALP) activity, and morphology of pulpal-like cells (RPC-C2A) and to evaluate the influence of reduced glutathione (GSH) on SDF-induced cytotoxicity and deposit formation on dentin. METHODOLOGY: The cytotoxicity of diluted 38% SDF solutions (10-4 and 10-5), with or without the addition of 5 mM or 50 mM GSH, was evaluated at 6 and 24 hours. Cell viability was detected using WST-8 and the effect on ALP activity was performed using an ALP assay kit. Cell morphology was observed using a phase-contrast microscope. Scanning electron microscopy analysis was conducted to evaluate the effect of GSH incorporation or conditioning on SDF-induced deposit formation on dentin discs. Cytotoxicity data were analyzed by two-way analysis of variance (ANOVA) and Tukey post hoc tests (p<0.05). RESULTS: There were significant differences between the groups. The results demonstrated that all tested SDF dilutions caused a remarkable cytotoxic effect, while the addition of GSH prevented SDF-induced damage at 6-hour exposure time in the higher dilution of SDF. Dentin treated with plain SDF or GSH-incorporated SDF solution showed deposit formation with occluded dentinal tubules, unlike the other groups. CONCLUSION: SDF severely disturbed the viability, mineralization-ability, and morphology of pulpal-like cells, while controlled concentrations of GSH had a short-term protective effect against SDF-induced damage. GSH showed an inhibitory effect on SDF-induced dentinal deposit formation. Further research is warranted to evaluate the effect of GSH on caries-arresting, anti-hypersensitivity, and antibacterial functions of SDF.

The effect of reduced glutathione on the toxicity of silver diamine fluoride in rat pulpal cells

Abstract Introduction Due to its ability to arrest untreated dental caries, silver diamine fluoride (SDF) has been advocated for indirect pulp capping procedures. However, the high concentrations of silver and fluoride in SDF raise concerns about its biocompatibility to pulpal tissues. Objectives This study aimed to investigate the effect of SDF on the viability, alkaline phosphatase (ALP) activity, and morphology of pulpal-like cells (RPC-C2A) and to evaluate the influence of reduced glutathione (GSH) on SDF-induced cytotoxicity and deposit formation on dentin. Methodology The cytotoxicity of diluted 38% SDF solutions (10-4 and 10-5), with or without the addition of 5 mM or 50 mM GSH, was evaluated at 6 and 24 hours. Cell viability was detected using WST-8 and the effect on ALP activity was performed using an ALP assay kit. Cell morphology was observed using a phase-contrast microscope. Scanning electron microscopy analysis was conducted to evaluate the effect of GSH incorporation or conditioning on SDF-induced deposit formation on dentin discs. Cytotoxicity data were analyzed by two-way analysis of variance (ANOVA) and Tukey post hoc tests (p<0.05). Results There were significant differences between the groups. The results demonstrated that all tested SDF dilutions caused a remarkable cytotoxic effect, while the addition of GSH prevented SDF-induced damage at 6-hour exposure time in the higher dilution of SDF. Dentin treated with plain SDF or GSH-incorporated SDF solution showed deposit formation with occluded dentinal tubules, unlike the other groups. Conclusion SDF severely disturbed the viability, mineralization-ability, and morphology of pulpal-like cells, while controlled concentrations of GSH had a short-term protective effect against SDF-induced damage. GSH showed an inhibitory effect on SDF-induced dentinal deposit formation. Further research is warranted to evaluate the effect of GSH on caries-arresting, anti-hypersensitivity, and antibacterial functions of SDF.

Efetividade da aplicação semestral de verniz fluoretado no controle da cárie dentária em pré-escolares: resultados após 12 meses de acompanhamento / Effectiveness of bi-annual fluoride varnish application in the control of dental caries in preschool children: results after 12 months of follow-up

O presente estudo teve como objetivos avaliar se a aplicação de verniz fluoretado com periodicidade semestral em crianças pré-escolares reduz o número de crianças com lesões de cárie em dentina na dentição decídua, diminui a incidência de lesões de cárie em esmalte e dentina, está inversamente associado à ocorrência de dor e abscesso dentário e produz quaisquer efeitos adversos. A população de estudo consistiu de 200 crianças na faixa etária de 12 a 48 meses, recrutadas em uma unidade de saúde pública da cidade do Rio de Janeiro, as quais foram alocadas aleatoriamente nos grupos teste (verniz fluoretado Duraphat®) e controle (verniz placebo). Para o registro da incidência de cárie, as crianças foram examinadas na linha de base e a cada seis meses, durante um ano, por dois odontopediatras previamente treinados e calibrados (Kappa=0,85). A ocorrência de dor, abscesso e efeitos adversos foi verificada a partir de entrevistas com os responsáveis. Os participantes, os seus responsáveis, os operadores e os examinadores desconheciam a qual grupo cada criança pertencia. No final do período de acompanhamento, 71 crianças do grupo teste e 77 do grupo controle foram avaliadas. Constatou-se que, nos grupos teste e controle, o número de crianças com novas lesões de cárie em dentina foi igual a 13 e 20 (teste Qui-quadrado, p=0,34) e que a média do incremento de cárie considerando apenas lesões em dentina (c3eos) foi de 1,1(dp=3,4) e de 1,4(dp=2,8), respectivamente (teste de Mann-Whitney, p=0,29). Uma criança apresentou dor de dente e abscesso dentário e outras duas crianças apresentaram apenas dor de dente. Todas pertenciam ao grupo teste. Com relação aos efeitos adversos, encontrou-se que uma criança pertencente ao grupo controle relatou ardência na cavidade bucal após a aplicação do placebo e que o responsável por um participante do grupo teste sentiu-se incomodado com a coloração amarelada dos dentes da criança após a aplicação do verniz fluoretado. ....

The aims of this study were to evaluate whether the application of fluoride varnish in preschool children at six-month intervals reduces the number of children with dentin caries and decreases the incidence of enamel and dentinal caries lesions in the primary dentition. We also sought to assess whether this intervention is inversely associated with the occurrence of tooth abscess and dental pain and to describe any possible side effects. The study population comprised 200 children, 12 to 48 months of age. They were enlisted in a public health center in the city of Rio de Janeiro and were randomly assigned to the test group (Duraphat® fluoride varnish) or the control group (placebo varnish). To record caries incidences, the children were examined at the baseline and every six months, during the period of one year, by two trained and calibrated pediatric dentists (Kappa=0.85). The presence of pain, abscess and side effects were recorded through interviews with the children’s caregivers. The children, their caregivers, the operators and the examiners did not know which group each child belonged. At the end of the follow-up period, 71 children of test group and 77 of the control group were analyzed. We found that 13 children in the test group and 20 children in the control group presented new dentinal caries lesions (Chi-square test, p= 0.34) and that the mean caries increment at the dentin level was 1.1(dp= 3.4) and 1.4 (dp=2.8) in the test and the control groups respectively (Mann-Whitney test, p=0,29). One child reported dental pain and tooth abscess, and two other children reported only dental pain. All three children belonged to the test group. One child reported a burning sensation in the mouth following application of the placebo varnish and one parent of a child in the test group felt upset about the yellowish discoloration of the child’s teeth after the application of the fluoride varnish. We concluded that the six-monthly ...(AU)

Técnica de spray para aplicaçöes tópicas de soluçöes fluoretadas / Topical application of fluoride solutions by spray technique (II)

Foram selecionadas 422 crianças (de 6 a 10 anos), as quais receberam diferentes aplicaçöes de soluçöes fluoretadas (FFA 1,23 por cento F, FFA 0,5 por cento F ea associaçäo de uma soluçäo saturada de DCPD com a FFA 0,5 por cento), sob a forma de um jato de spray devidamente balanceado (30 libras de pressäo e emissäo de 10ml de soluçäo para cada aplicaçäo). As crianças receberam uma aplicaçäo anual dessas soluçöes e foram observadas durante 24 meses. A análise dos resultados indicam que: a) um provável ingestäo das soluçöes aplicadas foi detectada em média em apenas 19 por cento das crianças. b) os efeitos tóxicos decorrentes da ingestäo involuntária da soluçäo fluoretada foram mínimos (2 a 3 por cento dos casos com ingestäo). Concluindo, esses resultados associados a simplicidade do equipamento (manipulaçäo e baixo custo de produçäo), a facilidade de aplicaçäo técnica, aos benefícios preventivos, a inocuidade do spray e a aceitaçäo pelas crianças, permitem indicá-la como uma técnica adequada para uso em saúde pública

Prevençäo da cárie dental com aplicaçöes tópicas semestrais de flúor-fosfato acidulado / Dental caries prevention through APF Gel-Tray applications each six months

Foram analisados os resultados preventivos da aplicaçäo tópica semestral de gel com flúor-fosfato acidulado em 998 crianças, de 6, 8 e 10 anos, provenientes de famílias de baixa renda. Utilizou-se a metodologia de aplicaçäo em massa sem profilaxia prévia desenvolvida no contexto do Programa Nacional de Prevençäo da Cárie Dental. Após um ano, constatou-se em localidades sem fluoretaçäo da água de consumo público reduçäo na incidência de cárie da ordem de 31,6 por cento em crianças de 6 anos, 24,9 por cento aos 8 anos e 39,5 por cento aos 10 anos, segundo o índice CPO-S. Nas localidades com flúor na água, as reduçöes foram, respectivamente, de 24,3 por cento, 26,6 por cento e 27,7 por cento, em todos os casos com significância estatística ao nível de 95 por cento. Face aos resultados positivos e à segurança, custo reduzido e praticidade do método, recomenda-se que os programas de saúde bucal em todos os níveis desenvolvam açäo preventiva permanente, abrangente e sem soluçäo de continuidade pra as crianças sob sua responsabilidade