Efecto del post curado en las propiedades físicas y mecánicas de resinas dentales de impresión 3D para restauraciones definitivas.
Fecha
2024
Tipo
tesis de maestría
Autores
Umaña Alfaro, Glenda
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Resumen
En odontología restaurativa, se observó un crecimiento exponencial en el uso de tecnologías digitales, lo cual genera la necesidad de aumentar la investigación científica en esta área. Objetivo: evaluar el efecto de protocolos de poscurado y almacenamiento en propiedades físicas y ópticas de resina de impresión 3D para restauraciones definitivas. Materiales y métodos: se utilizaron tres marcas de resina para impresión 3D de restauraciones (2 para definitivas y 1 control para provisionales): VSS ( Varseo Smilecrown), SCT (Saremco Crowntec), ADT (Denta Tooth ASIGA). Para medir la estabilidad de color se imprimieron (Asiga Max UV) 84 discos de 10x2 mm de los materiales mencionados sometidos a dos tiempos de postcurado (90 s y 180 s), divididos luego en partes iguales para envejecer por 40 días en agua destilada y café, totalizando 12 grupos con una n= 7. A cada muestra se le realizó una medida de las coordenadas de color (L*a*b*H*C*) con un espectrofotómetro de uso dental (Easy Shade, Vita) antes y después del envejecimiento. Se calculó su ΔE (CIEDE 2000) y los datos se analizaron con la prueba de Anova de tres vías (material*poscurado*envejecimiento*) y Tukey (α=0.05). Para medir la resistencia a la flexión y el módulo de elasticidad se imprimieron 60 barras de 25x2x2 mm (ISO 10477) de cada material, divididas posteriormente en partes iguales para someterlas a dos ciclos de poscurado (90 y 180 s, n = 15), la mitad de las muestras se quebraron al inicio y las demás se almacenaron en agua destilada durante 3 meses para envejecer. Se sometieron a la prueba de flexión de tres puntos (ISO 10477), utilizando una máquina de pruebas universal electromecánica (Electropuls E3000, Instron) operando a 1 mm/min y los cálculos de las variables se generaron con el software asociado (Bluehill Universal). Los resultados se registraron en MPa para la flexión y en GPa para el módulo de elasticidad. Los datos de flexión se analizaron estadísticamente con las pruebas Anova de tres vías y Tukey, los datos de módulo se analizaron mediante la prueba de la mediana de Mood, todas las pruebas a un nivel de significancia de 0.05. Resultados: el Anova de tres vías para estabilidad de color reveló que los tres factores resultaron estadísticamente significativos (p < 0.05), también resultaron significativas las interacciones “Material vs. Envejecimiento” (p < 0.0001) y “Fotocurado vs. Envejecimiento” y la triple interacción “Material vs. Fotocurado vs. Envejecimiento” (p < 0.008). Para resistencia a la flexión se reveló que los tres factores resultaron estadísticamente significativos (p < 0.0001), también resultaron significativas las interacciones “Material vs. Envejecimiento” (p < 0.0001) y “Fotocurado vs. Envejecimiento” (p < 0.011). Para el módulo de elasticidad, la mediana de Mood reveló que los factores “Material” (p < 0.0001) y “Fotocurado” (p = 0.016) resultaron estadísticamente significativos. Conclusiones: un tiempo de poscurado de 180 segundos produce mayor resistencia a la flexión, módulo de elasticidad y estabilidad de color en las resinas de impresión 3D que se estudian. La resina de impresión 3D de uso provisional Asiga Dental Tooth posee una resistencia a la flexión y un módulo de elasticidad similar a la resina de indicación definitiva Saremco Crowntec, pero tiene un mal comportamiento en estabilidad de color. Las resinas de impresión 3D con indicación de uso definitivo Saremco Crowntec y Varseo Smile Crown poseen una buena estabilidad de color, al estar en contacto con café a lo largo de 40 días, tanto para un poscurado de 90 s como de 180 s. La resina Varseo Smile Crown tiene los valores más bajos de resistencia a la flexión y módulo de elasticidad al ser comparada con las otras dos resinas. En esta investigación, la resina Saremco Crowntec cuenta con las mejores características físicas y mecánicas.
In restorative dentistry, an exponential growth in the use of digital technologies has been observed, which generates the need to increase scientific research in this area. Objective: To evaluate the effect of post-curing protocols and storage on physical and optical properties of 3D printing resin for definitive restorations. Materials and Methods: Three brands of resin were used for 3D printing of restorations (2 for definitive and 1 control for provisional): VSS (Varseo Smilecrown), SCT (Saremco Crowntec), ADT (Denta Tooth ASIGA). To measure color stability, 84 10x2mm discs of the materials were printed (Asiga Max UV), subjected to two post-curing times (90 s and 180 s), being then divided into equal parts to be aged for 40 days in distilled water and coffee. A total of 12 groups with n= 7. Each sample was subjected to a color coordinate measurement (L*a*b*H*C*) with a dental spectrophotometer (Easy Shade, Vita) before and after aging. Its ΔE (CIEDE 2000) was calculated and the data were analyzed with the three-way ANOVA test (material* post-curing*aging*) and Tukey (α=0.05). To measure the flexural strength and modulus of elasticity, 60 bars of 25x2x2mm (ISO 10477) of each material were printed, then divided into equal parts to be subjected to two post-curing cycles (90 and 180 s, n=15), half of the samples were broken at the beginning and the rest were stored in distilled water for 3 months to be aged. They are subjected to the 3-point bending test (ISO 10477), using an electromechanical universal testing machine (Electropuls E3000, Instron) operating at 1 mm/min and the calculations of the variables were generated with the associated software (Bluehill Universal). The results are recorded in MPa for bending and in GPa for the elastic modulus. The bending data were statistically analyzed with the 3-way ANOVA and Tukey tests, the modulus data were analyzed using the Mood median test, all tests at a significance level of 0.05. Results: The 3-way ANOVA for color stability revealed that the 3 factors were statistically significant (p < 0.05), the interactions “Material vs. Aging” (p < 0.0001) and “Light curing vs. Aging” and the triple interaction “Material vs. Light curing vs. Aging” (p<0.008). For flexural strength it revealed that the 3 factors were statistically significant (p<0.0001), the interactions “Material vs. Aging” (p<0.0001) and “Photocuring vs. Aging” (p<0.011) were also significant. For the elasticity modulus, the Mood median revealed that the factors “Material” (p<0.0001). and “Photocuring” (p=0.016). were statistically significant. Conclusions: A post-curing time of 180 seconds produces greater flexural strength, elastic modulus and color stability in the 3D printing resins studied. The provisional use 3D printing resin Asiga Dental Tooth has a flexural strength and elastic modulus like the definitive indication resin Saremco Crowntec but has poor performance in color stability. The 3D printing resins with a definitive use indication, Saremco Crowntec and Varseo Smile Crown, have good colour stability when in contact with coffee for 40 days, both for a 90 s and 180 s post-curing. The Varseo Smile Crown resin has the lowest values of flexural strength and modulus of elasticity when compared to the other two resins. In this research, the Saremco Crowntec resin has the best physical and mechanical characteristics
In restorative dentistry, an exponential growth in the use of digital technologies has been observed, which generates the need to increase scientific research in this area. Objective: To evaluate the effect of post-curing protocols and storage on physical and optical properties of 3D printing resin for definitive restorations. Materials and Methods: Three brands of resin were used for 3D printing of restorations (2 for definitive and 1 control for provisional): VSS (Varseo Smilecrown), SCT (Saremco Crowntec), ADT (Denta Tooth ASIGA). To measure color stability, 84 10x2mm discs of the materials were printed (Asiga Max UV), subjected to two post-curing times (90 s and 180 s), being then divided into equal parts to be aged for 40 days in distilled water and coffee. A total of 12 groups with n= 7. Each sample was subjected to a color coordinate measurement (L*a*b*H*C*) with a dental spectrophotometer (Easy Shade, Vita) before and after aging. Its ΔE (CIEDE 2000) was calculated and the data were analyzed with the three-way ANOVA test (material* post-curing*aging*) and Tukey (α=0.05). To measure the flexural strength and modulus of elasticity, 60 bars of 25x2x2mm (ISO 10477) of each material were printed, then divided into equal parts to be subjected to two post-curing cycles (90 and 180 s, n=15), half of the samples were broken at the beginning and the rest were stored in distilled water for 3 months to be aged. They are subjected to the 3-point bending test (ISO 10477), using an electromechanical universal testing machine (Electropuls E3000, Instron) operating at 1 mm/min and the calculations of the variables were generated with the associated software (Bluehill Universal). The results are recorded in MPa for bending and in GPa for the elastic modulus. The bending data were statistically analyzed with the 3-way ANOVA and Tukey tests, the modulus data were analyzed using the Mood median test, all tests at a significance level of 0.05. Results: The 3-way ANOVA for color stability revealed that the 3 factors were statistically significant (p < 0.05), the interactions “Material vs. Aging” (p < 0.0001) and “Light curing vs. Aging” and the triple interaction “Material vs. Light curing vs. Aging” (p<0.008). For flexural strength it revealed that the 3 factors were statistically significant (p<0.0001), the interactions “Material vs. Aging” (p<0.0001) and “Photocuring vs. Aging” (p<0.011) were also significant. For the elasticity modulus, the Mood median revealed that the factors “Material” (p<0.0001). and “Photocuring” (p=0.016). were statistically significant. Conclusions: A post-curing time of 180 seconds produces greater flexural strength, elastic modulus and color stability in the 3D printing resins studied. The provisional use 3D printing resin Asiga Dental Tooth has a flexural strength and elastic modulus like the definitive indication resin Saremco Crowntec but has poor performance in color stability. The 3D printing resins with a definitive use indication, Saremco Crowntec and Varseo Smile Crown, have good colour stability when in contact with coffee for 40 days, both for a 90 s and 180 s post-curing. The Varseo Smile Crown resin has the lowest values of flexural strength and modulus of elasticity when compared to the other two resins. In this research, the Saremco Crowntec resin has the best physical and mechanical characteristics
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Palabras clave
Odontología, Odontologie, Polímero, Polymers, Impresión 3D