Publication: Análisis in vitro de la fibra de carbono como mesoestructura de prótesis híbridas implantosoportadas
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2022-01-10
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Universidad Complutense de Madrid
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Abstract
El objetivo principal de la presente investigación fue cuantificar y comparar la resistencia a la fractura, tras ensayos de flexión, de prótesis híbridas implantosoportadas para determinar cuál es, mecánicamente, la combinación óptima de materiales de mesoestructura y recubrimiento y comprobar si los valores de resistencia obtenidos en los distintos grupos superan los límites considerables como clínicamente aceptables (900 N). Además, como objetivos secundarios, se evaluó si la localización de la carga aplicada (voladizos de 13 mm y 10 mm y sector anterior) condiciona la resistencia a la fractura entre los diferentes grupos de estudio y dentro de cada grupo de materiales. Finalmente, se planificó examinar por microscopía las probetas testadas para observar su patrón de factiura y clasificarlas por su tipo de fallo. Conclusiones: En el caso de las prótesis híbridas con cantilever de hasta 13 mm, la combinación óptima es una mesoestructura de cobalto-cromo con recubrimiento acrílico. La combinación de fibra de carbono con acrílico podría indicarse en prótesis híbridas con cantilever de hasta 10 mm. En principio, la combinación de fibra de carbono y composite solamente resultaría apta en prótesis híbridas sin cantilever. La presencia de cantilever y la longitud del mismo se asocian directamente a una menor resistencia a la fractura. Las prótesis de cobalto-cromo con acrílico y las de fibra de carbono recubiertas con composite exhibieron predominantemente fallos cohesivos, mientras que las prótesis de fibra de carbono con recubrimiento acrílico evidenciaron una rotura completa del armazón protético.
Aims: The main purpose of the current investigation was to quantify and compare the fracture resistance, after bending tests, of hybrid implant-supported prostheses to determine the optimal combination of mesostructure and veneering materials from the mechanical point of view, and to verify whether the resistance values obtained in the different groups exceed the limits that may be considered clinically acceptable (900 N). As secondary objects, it was assessed whether the location of the applied load (cantilevers of 10 mm and 13 mm and anterior sector) influences the fracture resistance within each group of materials and among the study groups. Finally, we planned to examine the tested prostheses under microscopy to observe their fracture pattern and to classify the samples by their failure type. Conclusions: For full-arch hybrid implant-supported prostheses with cantilevers up to 13 mm, the optimal combination of materials is cobalt-chromium coated with acrylic. The combination of carbon fiber in the mesostructure with acrylic as veneering material could be indicated in hybrid prostheses with cantilevers up to 10 mm. Carbon fiber mesostructures veneered with composite would only be suitable for hybrid prostheses without cantilevers. The presence of a cantilever and its length are directly associalted with lower fracture load values. Acrylic-veneered cobalt-chromium prostheses and composite-coated carbon fiber restorations predominantly exhibited cohesive failures, while acrylic-veneered carbon fiber prostheses mainly showed a complete break of the prosthetic framework.
Aims: The main purpose of the current investigation was to quantify and compare the fracture resistance, after bending tests, of hybrid implant-supported prostheses to determine the optimal combination of mesostructure and veneering materials from the mechanical point of view, and to verify whether the resistance values obtained in the different groups exceed the limits that may be considered clinically acceptable (900 N). As secondary objects, it was assessed whether the location of the applied load (cantilevers of 10 mm and 13 mm and anterior sector) influences the fracture resistance within each group of materials and among the study groups. Finally, we planned to examine the tested prostheses under microscopy to observe their fracture pattern and to classify the samples by their failure type. Conclusions: For full-arch hybrid implant-supported prostheses with cantilevers up to 13 mm, the optimal combination of materials is cobalt-chromium coated with acrylic. The combination of carbon fiber in the mesostructure with acrylic as veneering material could be indicated in hybrid prostheses with cantilevers up to 10 mm. Carbon fiber mesostructures veneered with composite would only be suitable for hybrid prostheses without cantilevers. The presence of a cantilever and its length are directly associalted with lower fracture load values. Acrylic-veneered cobalt-chromium prostheses and composite-coated carbon fiber restorations predominantly exhibited cohesive failures, while acrylic-veneered carbon fiber prostheses mainly showed a complete break of the prosthetic framework.
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Odontología, Departamento de Odontología Conservadora y Prótesis, leída el 24-09-2021