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Fabrico de coroas dentárias de alumina reforçada com zirconia por manufatura aditiva
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O aumento da esperança média de vida e a crescente preocupação pela saúde oral têm intensificado a procura por materiais restauradores capazes de mimetizar o tecido dentário perdido. As coroas dentárias são amplamente utilizadas, porém apresentam limitações, como desgaste, fratura e desperdício de material associado aos métodos convencionais de fabrico. Neste contexto, o fabrico aditivo surge como uma alternativa promissora. Esta dissertação teve como objetivo desenvolver um compósito cerâmico de alumina reforçada com zircónia, avaliando o seu potencial para a produção de coroas dentárias por robocasting. Inicialmente, foram produzidas amostras por vazamento de suspensões, com 5, 10, 15 e 20% de concentração mássica de zircónia. O compósito 10%ZTA evidenciou o equilíbrio mais adequado entre porosidade, dureza e tenacidade. Foram posteriormente formuladas pastas com reologia adequada para o robocasting, permitindo imprimir Al2O3-Rb, ZrO2-Rb e ZTA-Rb. Os materiais impressos foram caracterizados mecanicamente e comparados com zircónia comercial. Os resultados demonstraram que o ZTA-Rb apresenta a combinação mais favorável de densidade, dureza e tenacidade, destacando-se como o material mais promissor para coroas dentárias.
The rise in longevity and the growing concern for oral health have intensified the demand for restorative materials capable of mimicking lost dental tissue. Dental crowns are widely used, however, they present limitations such as wear, fracture, and material waste associated with conventional manufacturing methods. In this context, additive manufacturing emerges as a promising alternative. This dissertation aimed to develop a ceramic composite of alumina reinforced with zirconia, evaluating its potential to produce dental crowns through robocasting. Initially, samples were produced by slip casting, with 5, 10, 15, and 20% zirconia mass concentration. The 10%ZTA composite showed the most suitable balance between porosity, hardness, and toughness. Pastes with suitable rheology for robocasting were subsequently formulated, enabling the printing of Al₂O₃-Rb, ZrO₂-Rb, and ZTA-Rb. The printed materials were mechanically characterized and compared with commercial zirconia. The results demonstrated that ZTA-Rb presents the most favorable combination of density, hardness, and toughness, standing out as the most promising material for dental crown applications.
The rise in longevity and the growing concern for oral health have intensified the demand for restorative materials capable of mimicking lost dental tissue. Dental crowns are widely used, however, they present limitations such as wear, fracture, and material waste associated with conventional manufacturing methods. In this context, additive manufacturing emerges as a promising alternative. This dissertation aimed to develop a ceramic composite of alumina reinforced with zirconia, evaluating its potential to produce dental crowns through robocasting. Initially, samples were produced by slip casting, with 5, 10, 15, and 20% zirconia mass concentration. The 10%ZTA composite showed the most suitable balance between porosity, hardness, and toughness. Pastes with suitable rheology for robocasting were subsequently formulated, enabling the printing of Al₂O₃-Rb, ZrO₂-Rb, and ZTA-Rb. The printed materials were mechanically characterized and compared with commercial zirconia. The results demonstrated that ZTA-Rb presents the most favorable combination of density, hardness, and toughness, standing out as the most promising material for dental crown applications.
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Restauração dentária Coroa dentária Impressão 3D Alumina Zircónia Alumina reforçada com zircónia Dental restoration Dental crown 3D printing Zirconia-toughened alumina