Thesis (Ph. D.)--University of Hong Kong, 1999. / Includes bibliographical references (leaves 259-298).

Thesis (doctoral)--Karolinska Institutet, Stockholm, 1987. / Added t.p. with thesis statement inserted. Includes bibliographical references.

Made available in DSpace on 2015-06-17T19:34:31Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-02-27. Added 1 bitstream(s) on 2015-06-18T12:48:42Z : No. of bitstreams: 1 000830016.pdf: 688177 bytes, checksum: 7da484180c30b4c7be3d6f5ba2146a83 (MD5) / Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) / O presente estudo teve como objetivo avaliar as concentrações de fluoreto (F) na saliva após a escovação com dentifrícios contendo diferentes concentrações de F (0, 550 e 1100 ppm F, pH neutro) em diferentes quantidades (0,1, 0,3 e 0,5 g). Os voluntários (n = 24, 8-10 anos de idade) foram aleatoriamente divididos em 9 grupos experimentais, de acordo com as possíveis combinações de dentifrícios e quantidades. Estes foram instruídos a escovar seus dentes 3 vezes ao dia durante uma semana com um dentifrício placebo (período de wash out). No sétimo dia, foi coletada uma amostra de saliva estimulada (baseline) previamente à escovação, seguindo um protocolo duplo-cego e cruzado. Em seguida, as crianças escovaram os dentes por um minuto com a respectiva combinação de dentifrício e quantidade, sendo as amostras de saliva coletadas 5, 15, 30, 60 e 120 minutos após. O protocolo foi repetido por 8 semanas adicionais, contemplando o protocolo cruzado do estudo. As amostras foram centrifugadas e os sobrenadantes, congelados para posterior análise de F, utilizando um eletrodo íon-seletivo (Orion 9409) e um eletrodo de referência (Orion 9002) após tamponamento com TISAB III. A área sob a curva (AUC) para o clearance do fluoreto na saliva foi calculada usando os pontos individuais (regra trapezoidal). Os dados de fluxo salivar, concentração de F na saliva nos diferentes tempos de coleta, bem como de AUC foram submetidos a ANOVA a dois critérios, de medidas repetidas, seguida pelo teste de Student-Newman-Keuls (p<0.05). Foi observado um pico nas concentrações de F na saliva 5 min após a escovação, as quais decresceram exponencialmente nas coletas seguintes. Uma relação dose-resposta evidente foi observada entre a concentração e quantidade de F nos dentifrícios e a AUC da concentração de F na saliva (p<0,001). A escovação... / This aim of this study was to evaluate fluoride (F) concentrations in saliva of children after brushing with dentifrices containing different F concentrations (0, 550 and 1100 ppm F) in different amount (0.1, 0.3 and 0.5 g). Volunteers (n=24, 8-10 years old) were randomly assigned into 9 experimental groups, according to the possible combinations of F concentrations in the dentifrices and amount used, following a double-blind, crossover protocol. They were instructed to brush their teeth with a placebo dentifrice, 3 times/day, during one week (wash out period). On the 7th day, stimulated saliva was collected prior to toothbrushing (baseline) with the assigned combination of dentifrice type and amount. Following, saliva samples were collected at 5, 15, 30, 60 and 120 min after toothbrushing and the protocol was then repeated for 8 additional weeks, in order to follow the crossover protocol. Saliva samples were then centrifuged and the supernatants were frozen until F analysis, which was carried out using ion-selective (Orion 9409) and reference (Orion 9002) electrodes after buffering with TISAB III. The area under the curve (AUC) for salivary fluoride clearance was calculated using the individual points (trapezoidal rule). Data of salivary flow rate, salivary F concentrations at each collection point, as well as of AUC were submitted to two-way, repeated measures ANOVA, followed by the Student-Newman-Keuls test (p<0.05). A marked peak in salivary fluoride concentrations was seen 5 min after brushing, decreasing exponentially afterwards. A clear dose-response relationship was seen between fluoride concentration and amount of dentifrice used and the mean AUC of salivary F concentrations (p<0.001). Toothbrushing with 0.3 and 0.5 g of the low-fluoride toothpaste (550 ppm F) led to significantly higher AUC values when compared with the...

Orientador: Juliano Pelim Pessan / Coorientador: Alberto Carlos Botazzo Delbem / Banca: Jonas de Almeida Rodrigues / Banca: Douglas Roberto Monteiro / Resumo: O presente estudo teve como objetivo avaliar as concentrações de fluoreto (F) na saliva após a escovação com dentifrícios contendo diferentes concentrações de F (0, 550 e 1100 ppm F, pH neutro) em diferentes quantidades (0,1, 0,3 e 0,5 g). Os voluntários (n = 24, 8-10 anos de idade) foram aleatoriamente divididos em 9 grupos experimentais, de acordo com as possíveis combinações de dentifrícios e quantidades. Estes foram instruídos a escovar seus dentes 3 vezes ao dia durante uma semana com um dentifrício placebo (período de "wash out"). No sétimo dia, foi coletada uma amostra de saliva estimulada (baseline) previamente à escovação, seguindo um protocolo duplo-cego e cruzado. Em seguida, as crianças escovaram os dentes por um minuto com a respectiva combinação de dentifrício e quantidade, sendo as amostras de saliva coletadas 5, 15, 30, 60 e 120 minutos após. O protocolo foi repetido por 8 semanas adicionais, contemplando o protocolo cruzado do estudo. As amostras foram centrifugadas e os sobrenadantes, congelados para posterior análise de F, utilizando um eletrodo íon-seletivo (Orion 9409) e um eletrodo de referência (Orion 9002) após tamponamento com TISAB III. A área sob a curva (AUC) para o clearance do fluoreto na saliva foi calculada usando os pontos individuais (regra trapezoidal). Os dados de fluxo salivar, concentração de F na saliva nos diferentes tempos de coleta, bem como de AUC foram submetidos a ANOVA a dois critérios, de medidas repetidas, seguida pelo teste de Student-Newman-Keuls (p<0.05). Foi observado um pico nas concentrações de F na saliva 5 min após a escovação, as quais decresceram exponencialmente nas coletas seguintes. Uma relação dose-resposta evidente foi observada entre a concentração e quantidade de F nos dentifrícios e a AUC da concentração de F na saliva (p<0,001). A escovação... / Abstract: This aim of this study was to evaluate fluoride (F) concentrations in saliva of children after brushing with dentifrices containing different F concentrations (0, 550 and 1100 ppm F) in different amount (0.1, 0.3 and 0.5 g). Volunteers (n=24, 8-10 years old) were randomly assigned into 9 experimental groups, according to the possible combinations of F concentrations in the dentifrices and amount used, following a double-blind, crossover protocol. They were instructed to brush their teeth with a placebo dentifrice, 3 times/day, during one week (wash out period). On the 7th day, stimulated saliva was collected prior to toothbrushing (baseline) with the assigned combination of dentifrice type and amount. Following, saliva samples were collected at 5, 15, 30, 60 and 120 min after toothbrushing and the protocol was then repeated for 8 additional weeks, in order to follow the crossover protocol. Saliva samples were then centrifuged and the supernatants were frozen until F analysis, which was carried out using ion-selective (Orion 9409) and reference (Orion 9002) electrodes after buffering with TISAB III. The area under the curve (AUC) for salivary fluoride clearance was calculated using the individual points (trapezoidal rule). Data of salivary flow rate, salivary F concentrations at each collection point, as well as of AUC were submitted to two-way, repeated measures ANOVA, followed by the Student-Newman-Keuls test (p<0.05). A marked peak in salivary fluoride concentrations was seen 5 min after brushing, decreasing exponentially afterwards. A clear dose-response relationship was seen between fluoride concentration and amount of dentifrice used and the mean AUC of salivary F concentrations (p<0.001). Toothbrushing with 0.3 and 0.5 g of the low-fluoride toothpaste (550 ppm F) led to significantly higher AUC values when compared with the... / Mestre

Orientadores: Lívia Maria Andaló Tenuta, Jaime Aparecido Cury / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-17T11:14:39Z (GMT). No. of bitstreams: 1 Fernandes_JulianadeKassiaBraga_M.pdf: 1468971 bytes, checksum: b69a8db4f9c99d75424124a9bd67e50a (MD5) Previous issue date: 2010 / Resumo: Depósitos minerais do tipo fluoreto de cálcio ("CaF2") são formados no esmalte após aplicação tópica profissional de flúor (ATPF). Esses depósitos atuam como um reservatório de íons flúor para o fluido do biofilme, os quais reduzem a desmineralização no esmalte. Neste trabalho, a hipótese de que o "CaF2" seja dissolvido mais rapidamente mediante desafios cariogênicos foi testada, assim como a influência do uso de dentifrício fluoretado nessa dissolução. Para isso, foi conduzido um estudo in situ, cruzado e duplo-cego com duas fases de 14 dias cada, nas quais 12 voluntários utilizaram um dispositivo intrabucal palatino contendo 12 blocos de esmalte tratados com flúor fosfato gel acidulado (12.300 ppm F, pH 3,6-3,9) no primeiro dia de cada fase experimental. Adicionalmente, dois blocos foram fixados com cera na porção anterior do dispositivo e 30 minutos após a ATPF foram retirados para a determinação do "CaF2" formado logo após o tratamento com fluoreto. Durante o período experimental, foi gotejada solução de sacarose a 20% sobre os blocos de esmalte nas freqüências de 2 ou 8X ao dia. Três vezes ao dia, os voluntários utilizaram dentifrício fluoretado (1100 µg F/g, NaF) ou não fluoretado. Após 2, 7 e 14 dias de uso do dispositivo, os blocos de esmalte foram coletados para a determinação do "CaF2" remanescente. A extração do "CaF2" foi feita com solução de KOH M, em duas extrações seqüenciais por 24 e 6 horas. Para análise estatística, os voluntários foram considerados blocos estatísticos (n=12) e o nível de significância adotado foi de 5%. A concentração do "CaF2" formado sobre os blocos de esmalte após a ATPF diminuiu em função do tempo (p<0,0001), embora 2 semanas após a ATPF continuasse mais alta do que blocos de esmalte não tratados com ATPF. Sob uso de dentifrício fluoretado, a dissolução do "CaF2" foi reduzida (p=0,0115), porém a freqüência de consumo de sacarose não parece ter interferido nessa dissolução (p=0,226). Os resultados sugerem que a dissolução do "CaF2" parece não ter sido influenciada pela freqüência de consumo de sacarose e que sua manutenção é favorecida pelo uso concomitante de dentifrício fluoretado. / Abstract: Calcium fluoride-like ("CaF2") deposits are formed on enamel after professional topical fluoride application, and they can serve as a reservoir of fluoride ions to the biofilm fluid, to reduce enamel demineralization. In the present study, the hypothesis that "CaF2" is more readily dissolved during a higher cariogenic challenge was tested. Also, the effect of exposure to fluoride dentifrices on "CaF2" dissolution was evaluated. Thus, a crossover, double-blind and in situ study was conducted in 2 phases of 14 days each. In each phase, 12 volunteers used intraoral palatal appliances containing 12 enamel blocks treated with acidulated phosphate fluoride, APF (12,300 ppm F, pH 3,6-3,9) on the first day of each phase. Additionally, two blocks were fixed with wax on the palatal appliance and removed 30 minutes after treatment with APF to determine the concentration of "CaF2" formed. During the experimental period, the enamel blocks were exposed to 20% sucrose solution 2X or 8X/day. Three times a day, the volunteers used fluoride dentifrice (1100 µg F/g, NaF) or non-fluoride dentifrice. On the 2th, 7th e 14th day of each phase, enamel blocks were collected and the remaining "CaF2" concentration was determined. For "CaF2" determination, blocks were immersed in 1.0 M KOH, for 24 and 6 h. Data was statistically analyzed considering the volunteers as statistical blocks (n=12) and the significance limit was set at 5%. "CaF2" concentration decrease with time (p<0.0001), but was still higher than enamel blocks not treated with APF 2 weeks after APF application. Under fluoride dentifrice use, "CaF2" dissolution was reduced (p=0.0115), but the frequency of sucrose exposure did not seem to have affected it (p=0.226). The findings suggest that the frequencies of sucrose exposure did not influence the "CaF2" dissolution; and that its maintenance is facilitated by the concurrent use of fluoride dentifrice. / Mestrado / Cariologia / Mestre em Odontologia

Indiana University-Purdue University Indianapolis (IUPUI) / It has been shown repeatedly that the partial control of dental caries is possible through the use of fluoride compounds, either systemically or topically. Almost all the different treatments, beside water fluoridation, need be conducted by the dentist or dental hygienist. The high ratio of dentist to population, the cost and the time factor limits their uses. The demand for a new method to control dental caries was utilized in which the benefit of the available anticariogenic agents could be given on mass scale, with low cost and which could be conducted with fewer trained personnel. A clinical study was designed to evaluate the feasibility and effectiveness of self-application of a new anticariogenic prophylactic paste on dental caries by means of toothbrush. The self-prophylaxis was conducted each six months, by six-grade school children under supervision after thorough demonstration on proper toothbrushing by the hygienist. After one year the results showed that the self-application of the anticariogenic prophylactic paste resulted in 73.1 and 58.5 per cent reductions in DMFT and DMRS, respectively. Also, the instruction and practice of proper toothbrushing by the children twice a year motivated them to improve their oral hygiene and periodontal condition by 40.0 and 42.0 per cent, respectively. It appears that the partial control of dental caries achieved on mass basis, at low cost and conducted by fewer trained personnel is as effective as the treatment given by the trained personnel.

Thesis (M.S.)--University of Michigan, 1987.

Thesis (M.S.)--University of Michigan, 1983.

Thesis (M.S.)--University of Michigan, 1988.

Thesis (M.S.)--University of Michigan, 1987.