Diferencia en la dureza de resinas utilizadas convencionalmente al polimerizarse con diferentes tipos de luz / Difference in hardness of composites polimerized with differnt types of lights

RESUMEN

Resumen Introducción y objetivo: Al utilizar resinas directas es importante conocer las características específicas de las mismas y las lámparas de fotocurado empleadas. Obtener evidencia científica para la selección de la resina, el tipo de lámpara y la técnica operatoria más adecuada para lograr un resultado clínico predecible. Materiales y métodos: Se evaluaron 24 grupos (10 por grupo), fotopolimerizadas con 3 tipos de lámparas: (Optilux® 501 - halógena a máxima potencia), (Optilux® 501 - halógena con rampa) y (Bluephase® - LED); y 4 tipos de resinas: Filtek® Supreme XT, Filtek® Z350, Tetric®N Ceram, y Esthet® X; empleando 2 técnicas de obturación: incremental y en bloque. Se evaluó la dureza a la penetración en Vickers en la parte superficial y profunda de cada muestra. Resultados: Filtek® Supreme XT presentó mayor dureza, seguida por Filtek® Z350, Esthet® X y Tetric® N Ceram. La dureza fue dependiente de la lámpara, siendo mayores los valores con Optilux® 501 con Rampa, seguida por Optilux® 501 a máxima potencia y finalmente LED Bluephase®. Se obtuvo mayor dureza con la técnica incremental en comparación con la técnica en bloque y en la zona superficial comparada con la zona profunda. Conclusion: se obtuvo mayor dureza con la resina Filtek® Supreme XT, fotocurada con la lámpara Optilux® 501 en rampa empleando la técnica de obturación incremental.

ABSTRACT

Abstract Introduction and objective: When using direct composites is important to take into account the specific characteristics of the material and the instruments like the curing lamp used to built any kind of restoration with composite. Create scientific evidence so professionals can choose the type of lamp, composite, and the needed technique to provide a better clinical result. Materials and methods: 10 samples were made in 24 groups, which evaluated 3 types of lamps: (Optilux® 501 - halogen at full power), (Optilux® 501 - halogen ramp) and (Bluephase® - LED), with 4 types of resins: Filtek® Supreme XT, Filtek® Z350, Tetric® N Ceram and Esthet ®X, and 2 placement techniques: incremental and block. The Vickers hardness by penetration at the surface and deep of each sample was evaluated. The results were analyzed both bi-and multivariate. Results: Filtek® Supreme XT showed the highest hardness, followed by Filtek® Z350, Tetric® N Ceram and Esthet® X. The hardness was dependent on the lamp; the values were higher with Optilux® 501 with ramp, followed by Optilux® 501 at full power and finally LED Bluephase®. Better results were obtained using the technique of incremental placement compared with the block one, and these were higher in the surface region compared to deep region. Conclusion: The highest hardness was obtained with resin Filtek® Supreme XT, using the lamp Optilux® 501 with ramp and positioned with an incremental technique.