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Aplicación,clinica,composites

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Contracción de los composites durante su aplicación clínica.

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Aplicación,clinica,composites

  1. 1. CONTRACCIÓN DE LOSCONTRACCIÓN DE LOS COMPOSITESCOMPOSITES Contracción de los CompositesContracción de los Composites 11
  2. 2. 0, 34 nm POLIMERIZACIÓN VINÍLICAPOLIMERIZACIÓN VINÍLICA DISTANCIA DE VAN DER WAALS 0,15 nm CONTRACCIÓN Contracción de los CompositesContracción de los Composites 22
  3. 3. O.34 MICRAS Molécula de monómero Molécula de monómero ANTES DE POLIMERIZAR O.15 MICRAS Molécula de monómero Molécula de monómero DESPUES DE POLIMERIZAR Contracción de los CompositesContracción de los Composites 33
  4. 4. 6 % COMPOSITES FLOW MAYOR PESO MOLECULAR MAYOR CONTRACCIÓN BAJO CONTENIDO CERÁMICO BIS- GMA MENOR CONTRACCIÓN Contracción de los CompositesContracción de los Composites 44
  5. 5. TENSIÓN O ETRÉS DE CONTRACCIÓN CONTRACCIÓN EFECTIVA ADHERIDA A UNA SOLA SUPERFICIE NO ADHERIDA CONTRACCIÓN LIBRE SOLUCIÓN DE CONTINUIDAD Contracción de los CompositesContracción de los Composites 55
  6. 6. CONTRACCIÓN NO LIBRE CONTRACCIÓN LIBRE Contracción de los CompositesContracción de los Composites 66
  7. 7. ESTRATIFICACIÓN VOLÚMENCONFIGURACIÓN OTROS FACTORES QUE INTERVIENEN EN LA APARICIÓN DEL ESTRÉS DE CONTRACCIÓN FOTOACTIVACIÓN Contracción de los CompositesContracción de los Composites 77
  8. 8. CONFIGURACIÓN MENOR CONTRACCIÓNMENOR CONTRACCIÓN C. CLASE IV MAYOR CAPACIDAD DE FLUIR EN LA PRIMERA FASE DE POLIMERIZACIÓN MAYOR CANTIDAD DE SUPERFICIES LIBRES Contracción de los CompositesContracción de los Composites 88
  9. 9. VOLUMEN MAYOR CONTRACCIÓN ABSOLUTA MAYOR VOLUMEN MAYOR TENSIÓN O ESTRESMAYOR TENSIÓN O ESTRES Contracción de los CompositesContracción de los Composites 99
  10. 10. ESTRATIFICACIÓN Capas de 2mm. EVITANDO CONECTAR CON LOS INCREMENTOS INICIALES LAS PAREDES LIBRES POLIMERIZACIÓN POR SEPARADO 15 SEGUNDOS PREVIA POLIMERIZACIÓN Contracción de los CompositesContracción de los Composites 1010
  11. 11. PROLONGAR PRIMERA FASE NIVELES MENORES DE ENERGIA 1mm. 40 SEGUNDOS FOTOACTIVACIÓN DISMINUIR LA TENSÍÓN POR CONTRACCIÓN DISMINUIR LA TENSÍÓN POR CONTRACCIÓN PUEDE FLUIR Contracción de los CompositesContracción de los Composites 1111
  12. 12. SORCIÓN DE AGUASORCIÓN DE AGUA  Cuando el estrés resultante es mayor queCuando el estrés resultante es mayor que la resistencia de la unión cuando el aguala resistencia de la unión cuando el agua es absorbida por los componentes de laes absorbida por los componentes de la resina se da laresina se da la ruptura hidrolitica.ruptura hidrolitica. LaLa resina incompletamente curada absorberáresina incompletamente curada absorberá mayor agua y dará mayor degradaciónmayor agua y dará mayor degradación hidrolìtica.hidrolìtica. Contracción de los CompositesContracción de los Composites 1212
  13. 13. FOTOPOLIMERIZACIÓNFOTOPOLIMERIZACIÓN  A medida que la polimerización de las resinasA medida que la polimerización de las resinas aumenta, las propiedades físicas mejoran, yaumenta, las propiedades físicas mejoran, y también aumenta la contracción portambién aumenta la contracción por polimerización.polimerización.  un color mas claro obtiene un grado de mayorun color mas claro obtiene un grado de mayor polimerización que los colores oscuros.polimerización que los colores oscuros.  las resinas con partículas mas grandes tiendenlas resinas con partículas mas grandes tienden a transmitir la luz mejor que aquellas dea transmitir la luz mejor que aquellas de partículas mas pequeñas.partículas mas pequeñas. Contracción de los CompositesContracción de los Composites 1313

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