Loading...
Publication
Avaliação da microinfiltração e libertação de ião fluoreto em selantes de resina e cimentos de ionómero de vidro modificados por resina : estudo in vitro
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 7.09 MB | Adobe PDF |
Advisor(s)
Abstract(s)
Objetivo: Este trabalho de investigação visa comparar as concentrações de ião de flúor
libertadas entre um Selante Resinoso (Fissurit – 3M ESPE ®) e um Cimento de Ionómero de Vidro Modificado por Resina (Photac Fil – 3M ESPE®) durante 5 semanas, em que dois grupos compostos por 15 dentes cada (N=30) estão armazenados num ambiente semelhante ao da cavidade oral. Após submissão das amostras a um processo de termociclagem, são comparadas novamente as concentrações de ião de
flúor libertado, bem como os níveis de microinfiltração apresentados em cada grupo.
Materiais e Métodos: Numa amostra de 30 molares hígidos foi feita uma distribuição
homogénea dos mesmos, formando dois grupos com 15 dentes cada um.
Num grupo, foi colocado Cimento de Ionómero de Vidro Reforçado por Resina (Photac
Fil – 3M ESPE®) (Grupo A); no outro grupo, foram colocados Selantes de Resina
Convencionais à base de Bis-GMA (Fissurit – 3M ESPE ®) (Grupo B).
Nos dois grupos (GA e GB) foi quantificada a concentração de ião de flúor libertada
pelos selantes, de 24 em 24 horas durante 7 dias.
A partir do 8º dia a quantificação foi realizada 1 vez por semana, durante 5 semanas.
No final das 6 semanas, os dois grupos ficaram 24 horas em água destilada à temperatura ambiente, sendo posteriormente submetidos a um processo de termociclagem, num período correspondente a 1 ano de envelhecimento.
Após a termociclagem, quantificou-se novamente a concentração de flúor libertada.
Posteriormente, os 30 dentes foram mergulhados numa solução de azul de metileno a
2% durante 24 horas, sendo depois cortados longitudinalmente no sentido Mesio-Distal.
Foi feita a avaliação dos níveis de microinfiltração, com recurso a uma lupa com aumento de 40x.
Os resultados foram tratados através de uma análise estatística, tendo sido realizado o
teste de t-Student e de Mann-Whitney.
Resultados: Verificou-se que o valor médio da concentração de flúor libertado pelo Grupo A (0,010±0,009) é inferior ao valor médio libertado pelo Grupo B (0,014±0,004),
embora a diferença não tenha significado estatístico (p>0,05).
Foram, no entanto, encontradas diferenças com significado estatístico (p=0,001) entre o
Grupo A (2,0±1,0) e o Grupo B (1,0±2,0), sendo que o GB apresenta níveis de microinfiltração significativamente menores.
Conclusão: O selante de resina mostra-se mais eficiente, revelando melhores propriedades mecânicas e uma semelhante libertação de flúor, comparando com o
CIVMR.
Objective: The aim of this research was to compare the concentrations of fluoride ion released between a resinous sealant (Fissurit - 3M ESPE ®) and a Resin Modified Glass Ionomer Cement (Photac Fil - 3M ESPE ®) for 5 weeks, where two groups composed of 15 teeth each (N = 30) are stored in an environment similar to the oral cavity. After submission of the samples to a thermocycling process, the concentrations of fluoride ion released, as well as the microleakage levels presented in each group, are again compared. Materials and Methods: In a sample of 30 healthy molars, a random allocation was made, forming two groups with 15 teeth each. In one group, Resin-Fortified Glass Ionomer Cement (Photac Fil-3M ESPE®) (Group A) was placed; in the other group, Conventional Resin Sealants based on Bis-GMA (Fissurit - 3M ESPE ®) (Group B) was placed. In both groups (GA and GB) the concentration of fluoride ion released by the sealants were measured every 24 hours for 7 days. From day 8 onwards, measures were performed once a week for 5 weeks. At the end of the 6 weeks, the two groups were left in distilled water at room temperature for 24 hours and then subjected to a thermocycling process in a period corresponding to one year of aging. After thermocycling, the concentration of fluoride released was measured again. Subsequently, the 30 teeth were dipped in a solution of 2% methylene blue for 24 hours, then cut longitudinally in the Mesio-Distal direction. The microleakage levels were evaluated using a magnifying glass with a magnification of 40x. The results were treated through a statistical analysis, where the t-Student test and the Mann-Whitney test were performed. Results: The mean value of the fluoride concentration released by Group A (0.010 ± 0.009) was lower than the mean value released by Group B (0.014 ± 0.004), although the difference was not statistically significant (p>0.05). However, differences with statistical significance (p = 0.001) were found between Group A (2.0 ± 1.0) and Group B (1.0 ± 2.0), with GB having microleakage levels significantly lower. Conclusion: The resin sealant is more efficient, showing better mechanical properties and a similar release of fluoride, compared to the resin modified glass ionomer.
Objective: The aim of this research was to compare the concentrations of fluoride ion released between a resinous sealant (Fissurit - 3M ESPE ®) and a Resin Modified Glass Ionomer Cement (Photac Fil - 3M ESPE ®) for 5 weeks, where two groups composed of 15 teeth each (N = 30) are stored in an environment similar to the oral cavity. After submission of the samples to a thermocycling process, the concentrations of fluoride ion released, as well as the microleakage levels presented in each group, are again compared. Materials and Methods: In a sample of 30 healthy molars, a random allocation was made, forming two groups with 15 teeth each. In one group, Resin-Fortified Glass Ionomer Cement (Photac Fil-3M ESPE®) (Group A) was placed; in the other group, Conventional Resin Sealants based on Bis-GMA (Fissurit - 3M ESPE ®) (Group B) was placed. In both groups (GA and GB) the concentration of fluoride ion released by the sealants were measured every 24 hours for 7 days. From day 8 onwards, measures were performed once a week for 5 weeks. At the end of the 6 weeks, the two groups were left in distilled water at room temperature for 24 hours and then subjected to a thermocycling process in a period corresponding to one year of aging. After thermocycling, the concentration of fluoride released was measured again. Subsequently, the 30 teeth were dipped in a solution of 2% methylene blue for 24 hours, then cut longitudinally in the Mesio-Distal direction. The microleakage levels were evaluated using a magnifying glass with a magnification of 40x. The results were treated through a statistical analysis, where the t-Student test and the Mann-Whitney test were performed. Results: The mean value of the fluoride concentration released by Group A (0.010 ± 0.009) was lower than the mean value released by Group B (0.014 ± 0.004), although the difference was not statistically significant (p>0.05). However, differences with statistical significance (p = 0.001) were found between Group A (2.0 ± 1.0) and Group B (1.0 ± 2.0), with GB having microleakage levels significantly lower. Conclusion: The resin sealant is more efficient, showing better mechanical properties and a similar release of fluoride, compared to the resin modified glass ionomer.
Description
Dissertação para obtenção do grau de Mestre no Instituto Universitário Egas Moniz
Keywords
Selantes Cimento de ionómero de vidro Cimento de ionómero de vidro reforçado por resina Microinfiltração Flúor