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In vitro fluoride release and tensile bond Strength of a polymeric intra-buccal bioadhesive / Liberación in vitro de flúor y fuerza de tracción de un bioadhesivo polimérico intra-bucal
Pedrazzi, Vinícius; Lara, Elza Helena Guimarães; Panzeri, Heitor; Collett, John H; Issa, João Paulo Mardegan.
  • Pedrazzi, Vinícius; University of São Paulo. Ribeirão Preto Faculty of Dentistry. São Paulo. BR
  • Lara, Elza Helena Guimarães; University of São Paulo. Ribeirão Preto Faculty of Pharmacy. São Paulo. BR
  • Panzeri, Heitor; University of São Paulo. Ribeirão Preto Faculty of Dentistry. São Paulo. BR
  • Collett, John H; University of Manchester. Faculty of Pharmacy. Manchester. GB
  • Issa, João Paulo Mardegan; University of São Paulo. Ribeirão Preto Faculty of Dentistry. São Paulo. BR
Int. j. morphol ; 27(3): 801-803, sept. 2009. ilus
Article in English | LILACS | ID: lil-598939
ABSTRACT
The intra-buccal polymeric bioadhesive systems that can stay adhered to the oral soft tissues for drug programmed release, with the preventive and/or therapeutic purpose has been employed for large clinical situations. A system based on hydroxypropyl methyl cellulose/Carbopol 934'/magnesium stearate (HPMC/Cp/StMg) was developed having the sodium fluoride as active principle. This kind of system was evaluated according to its resistance to the removal by means of physical test of tensile strength. Swine buccal mucosa extracted immediately after animals' sacrifice was employed as substrate for the physical trials, to obtain 16 test bodies. Artificial saliva with or without mucin was used to involve the substrate/bioadhesive system sets during the trials. Artificial salivas viscosity was determined by means of Brookfield viscometer, showing the artificial saliva with mucin 10.0 cP, and the artificial saliva without mucin 7.5 cP. The tensile strength assays showed the following averages: for the group "artificial saliva with mucin" - 12.89 Pa, and for the group "without mucin" - 12.35 Pa. Statistical analysis showed no significant difference between the assays for both artificial salivas, and it was possible to conclude that the variable mucin did not interfered with the bioadhesion process for the polymeric devices. The device was able to release fluoride in a safe, efficient and constant way up to 8 hours.
RESUMEN
Los sistemas bioadhesivos poliméricos intra-bucales pueden permanecer adheridos a los tejidos blandos orales para una liberación programada de fármacos, con finalidad preventiva y/o propósito terapéutico han sido empleados en diversas situaciones clínicas. Un sistema basado en Hidroxipropilmetilcelulosa/Carbopol934Ô/ estearato de magnesio (HPMC/Cp/StMg) fue desarrollado con fluorato de sodio como principio activo. Este tipo de sistema fue evaluado de acuerdo a su resistencia a la eliminación física por medio de pruebas de resistencia a la tracción. Mucosas bucales de cerdos fueron tomadas inmediatamente después del sacrificio de los animales y se utilizaron como sustrato para las pruebas físicas, obteniendo 16 cuerpos de prueba. Saliva artificial con o sin mucina fue utilizada para participar como parte del sistema sustrato/bioadesivo durante los ensayos. La viscosidad de la saliva artificial, se determinó mediante un viscosímetro Brookfield, mostrando la saliva artificial con mucina 10,0 cP y saliva artificial sin mucina 7,5 cP. Las pruebas de resistencia a la tracción mostraron los siguientes promedios: para la "saliva artificial con mucina" - 12,89 Pa, y para el grupo "sin mucina" - 12,35 Pa. El análisis estadístico no mostró diferencias significativas entre las pruebas de saliva artificial, y es posible concluir que la variable de mucina no interfiere con el proceso de bioadhesión del dispositivo polimérico. El dispositivo fue capaz de liberar fluor de forma segura, eficiente y constante durante un máximo de hasta 8 horas.
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Full text: Available Index: LILACS (Americas) Main subject: Swine / Fluorine / Mouth Mucosa Limits: Animals Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2009 Type: Article Affiliation country: Brazil / United kingdom Institution/Affiliation country: University of Manchester/GB / University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Swine / Fluorine / Mouth Mucosa Limits: Animals Language: English Journal: Int. j. morphol Journal subject: Anatomy Year: 2009 Type: Article Affiliation country: Brazil / United kingdom Institution/Affiliation country: University of Manchester/GB / University of São Paulo/BR