extremo libre en ppr
TRANSCRIPT
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Las clases I y II de Kennedy son consideradas o denominadas como extremo libre que merecen una
especial atención.
EXTREMO LIBRE
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• La diferencia de elasticidad entre el espacio periodontal y la mucosa.
• Reabsorción del hueso de reborde alveolar.
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• Al reabsorberse el hueso alveolar en distal hace que los molares superiores se extruyan
generando la modificación del plano oclusal.
• La magnitud de la alteración oclusal es proporcional al grado de reabsorción.
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MOVIMIENTOS DE UNA BASE A EXTREMO LIBRE
• 1. Movimiento de inclinación a distal.
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MOVIMIENTOS DE UNA BASE A EXTREMO LIBRE
• 2. Movimiento de traslación perpendicular
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MOVIMIENTOS DE UNA BASE A EXTREMO LIBRE• 3. Movimiento de traslación horizontal
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MOVIMIENTOS DE UNA BASE A EXTREMO LIBRE• 4. Movimiento de rotación horizontal
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MOVIMIENTOS DE UNA BASE A EXTREMO LIBRE• 5. Movimiento de torsión
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ANÁLISIS DE LAS PALANCAS EN EL EXTREMO
LIBRE• Si dividimos la longitud del brazo de potencia entre la longitud del brazo de resistencia
tenemos
• lo que se llama "ventaja mecánica" o "momento de palanca".
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ANÁLISIS DE LAS PALANCAS EN EL EXTREMO
LIBRE
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ROMPEFUERZAS• El propósito es disminuir la fuerza oclusal sobre los pilares y
derivarla a la mucosa, de esta manera hace a la prótesis
mucosoportada.
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VENTAJAS
• La resilencia del rompefuerzas sumada a la membrana
periodontal se compara a la resilencia de la mucosa
bucal.
• Da balance entre el pilar y el reborde.
• Elimina la inclinación de los pilares.
• Presión intermitente de las bases sobre la mucosa
semejante al masaje, semejante al masaje fisiológico
evitando la reabsorción.
• Reduce la fuerza sobre los pilares.
• Conford.
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DESVENTAJAS
• Difícil de construir.
• Reparación y mantenimiento complicado.
• Reduce la estabilidad.
• No aprovecha el soporte dentario.
• Al aumentar la flexibilidad puede producir mayor
reabsorción.
• Ocupan mayor volumen.
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DISEÑO PPR INFERIOR
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