RESUMENObjetivo: evaluar el comportamiento del dióxido de zirconio (Y-TZP) recubierto con diferentes grosores cerámicos ante fuerzas de cizalla. Materiales y métodos: se realizó un estudio experimental In vitro con treinta cilindros de dióxido de zirconio recubiertos con cerámica VITA VM9 de diferentes grosores (1mm, 1,5mm y 2mm) sometidos a fuerzas de cizallamiento. El grupo control lo conformaron barras de metal-cerámica recubiertas con VITA VM13. Se evaluó la interfase, la severidad de la deslaminación de la cerámica, la morfología de la fractura, el tipo de material, el grosor de la cerámica y el esfuerzo de la cerámica medido en Mpa. Las variables se analizaron de acuerdo con su naturaleza y distribución, se llevaron a cabo pruebas de Chi 2 , U. de Mann Whitney y también se realizó una regresión logística. Resultados: el 93,22% de las muestras sufrió deslaminación de tipo adhesivo. El 49,15% correspondieron a muestras de dióxido de zirconio. Hubo fallas leves en el 47,46% de las muestras y severas en el 18,64%. El tipo de material podría aumentar la severidad de la deslaminación (3,24 veces más) aunque la diferencia no fue estadísticamente significativa (OR 3,24 IC 95% 0,91 -1,16). Conclusiones: la deslaminación de la cerámica no es directamente proporcional al grosor. Además, el dióxido de zirconio presentó una resistencia al cizallamiento baja. IN VITRO BEHAVIOR WITH DIFFERENT THICKNESSES ON STRUCTURES CERAMIC ZIRCONIUM DIOXI-DE (y-TZP) BEFORE SHEARING FORCES ABSTRACTObjective: To assess the performance of zirconium oxide (Y-TZP) ceramic coated with different thicknesses shear forces. Methods: an In vitro experimental study was done with thirty zirconium dioxide cylinders coated with VITA VM 9 at different thicknesses (1.0 mm, 1.5 mm and 2.0 mm), they were subjected to shear forces. The control group consisted in metal-ceramic rods coated with VITA VM13. We evaluated the interface, the severity of delamination of the ceramic, the shape of the fracture, the type of material, the thickness of the ceramic and pottery effort measured in MPa. The variables were analyzed according to their nature and distribution; the tests used were Chi 2 , U. Mann Whitney and a logistic regression. Results: 93.22% of the samples suffered delamination of the adhesive type. The 49.15% were zirconium dioxide samples. Minor faults were obtained on a sample of 47.46% and 18.64% in severe. The material could increase the severity of delamination (3.24 times more) but the difference was not statistically significant (OR 3.24 95% CI 0.91 -1.16). Conclusions: delamination of the ceramic is not directly proportional to the thickness. Furthermore, the zirconium dioxide presented low shear strength.
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