Publication: Evaluación in vitro de un sistema de adhesión basado en grabado ácido en caliente para mejorar la fuerza de adhesión al óxido de circonio
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2022
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Abstract
INTRODUCCIÓN Y OBJETIVOS
En la búsqueda del material restaurador ideal en la Odontología Protética actual el óxido de circonio ha despertado un especial interés entre los investigadores del campo. Sin embargo, a pesar de sus propiedades mecánicas excelentes y comportamiento estético aceptable, existe una preocupación sustancial con respecto a su capacidad de adhesión por la ausencia de fase vítrea en su estructura. En un intento de construir un protocolo de adhesión fiable y universal, se han desarrollado numerosas técnicas que, de manera mecánica, química o combinada, buscan preparar la superficie de la circona para un mayor contacto con el agente cementante. Entre los métodos de tratamientos de superficie existentes hasta el momento, se encuentra la aplicación de soluciones químicas de ácido fluorhídrico (AF). Si bien esta técnica ha sido mencionada otras veces en la literatura, su utilización en baja concentración y con aporte de calor no se ha llegado a estudiar exhaustivamente. Por ello, el objetivo del presente estudio fue evaluar la fuerza de adhesión entre la circona y el cemento de resina resultante de la aplicación la técnica de grabado ácido en baja concentración y en caliente, en la superficie de la circona.
MATERIAL Y MÉTODOS
Un total de 32 discos (Ø 10 x h 3 mm) de óxido de circonio fueron aleatoriamente divididos entre un grupo que fue sometido a la técnica de chorreado con partículas de aluminio (grupo C) y otro grupo que fue sometido a la técnica de grabado ácido con AF a 100ºC durante 10 minutos (grupo HE). Tras los tratamientos de superficie correspondientes, se aplicó una capa de primer, y los discos de cada grupo fueron emparejados entre sí mediante un cemento de resina. Las probetas fueron almacenadas en agua durante 24 horas, y seguidamente fueron envejecidas artificialmente mediante un proceso de termociclado de 5000 ciclos. Finalmente, se llevaron a cabo ensayos de resistencia al cizallamiento. Los valores máximos de resistencias a las fuerzas de cizalla 13 (MPa) fueron registrados y estadísticamente analizados a través del test t de Student. El nivel de significación se estableció para p ≤0,05.
RESULTADOS
Se encontraron diferencias estadísticamente significativas (p ≤0,05) entre los resultados de los dos grupos de estudio. Los valores de resistencia al cizallamiento más altos correspondieron al grupo C (10,98±5,48), muy por debajo de los obtenidos en el grupo HE (5,20±0,86).
CONCLUSIÓN
Teniendo en cuenta las limitaciones de este estudio, la conclusión fue la siguiente: El chorreado parece ser más eficaz que el grabado ácido con AF en caliente como tratamiento de superficie para mejorar la adhesión entre la circona y el cemento de resina.
INTRODUCTION AND OBJECTIVES In the search for the ideal restorative material in current Prosthetic Dentistry, zirconia has aroused a special interest among researchers in the field. However, despite its excellent mechanical properties and acceptable aesthetic behavior, there is substantial concern regarding its adhesion capacity due to the absence of a glassy phase in its structure. In an attempt to build a reliable and universal bonding protocol, numerous techniques have been developed which, mechanically, chemically or in combination, pursue to prepare the zirconia surface to achieve a greater contact with the luting agent. Among the existing surface treatment methods, the application of chemical solutions of hydrofluoric acid (AF) has been proposed. Although this technique has been mentioned in dental literature, its use in low concentration and with heat has not been studied exhaustively. Therefore, the objective of the present study was to evaluate the bond strength between zirconia and resin cement resulting from the application of a hot, low-concentration acid etching technique on the zirconia surface. MATERIAL AND METHODS A total of 32 zirconia discs (Ø 10 x h 3 mm) were randomly assigned to either a group that was subjected to the sandblasting technique with aluminum particles (group C) or to another group that was subjected to the acid etching technique with AF at 100°C for 10 minutes (group HE). After the corresponding surface treatments, a primer layer was applied, and the discs of each group were matched with each other using a resin cement. The specimens were stored in water for 24 hours, and then were artificially aged through a 5000-cycle thermocycling process. Finally, shear bond strength tests were carried out. The maximum values of resistance to shear forces (MPa) were recorded and statistically analyzed through the Student's t-test. The level of significance was set at p≤0.05.10 RESULTS Statistically significant differences (p≤0.05) were found between the results of the two study groups. The highest shear strength values corresponded to group C (10.98±5.48), well below those obtained in group HE (5.20±0.86). CONCLUSION Within the limitations of this study, the following conclusion could be drawn: Sandblasting seems to be more effective than hot AF acid etching as a surface treatment to improve the adhesion between zirconia and resin cement.
INTRODUCTION AND OBJECTIVES In the search for the ideal restorative material in current Prosthetic Dentistry, zirconia has aroused a special interest among researchers in the field. However, despite its excellent mechanical properties and acceptable aesthetic behavior, there is substantial concern regarding its adhesion capacity due to the absence of a glassy phase in its structure. In an attempt to build a reliable and universal bonding protocol, numerous techniques have been developed which, mechanically, chemically or in combination, pursue to prepare the zirconia surface to achieve a greater contact with the luting agent. Among the existing surface treatment methods, the application of chemical solutions of hydrofluoric acid (AF) has been proposed. Although this technique has been mentioned in dental literature, its use in low concentration and with heat has not been studied exhaustively. Therefore, the objective of the present study was to evaluate the bond strength between zirconia and resin cement resulting from the application of a hot, low-concentration acid etching technique on the zirconia surface. MATERIAL AND METHODS A total of 32 zirconia discs (Ø 10 x h 3 mm) were randomly assigned to either a group that was subjected to the sandblasting technique with aluminum particles (group C) or to another group that was subjected to the acid etching technique with AF at 100°C for 10 minutes (group HE). After the corresponding surface treatments, a primer layer was applied, and the discs of each group were matched with each other using a resin cement. The specimens were stored in water for 24 hours, and then were artificially aged through a 5000-cycle thermocycling process. Finally, shear bond strength tests were carried out. The maximum values of resistance to shear forces (MPa) were recorded and statistically analyzed through the Student's t-test. The level of significance was set at p≤0.05.10 RESULTS Statistically significant differences (p≤0.05) were found between the results of the two study groups. The highest shear strength values corresponded to group C (10.98±5.48), well below those obtained in group HE (5.20±0.86). CONCLUSION Within the limitations of this study, the following conclusion could be drawn: Sandblasting seems to be more effective than hot AF acid etching as a surface treatment to improve the adhesion between zirconia and resin cement.
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