Objectives: The aim of this study was to carry out a review on the methods of direct detection of composite resins´ degree of conversion.Data/sources: The authors searched the Cochrane Library, Embase, PubMed, and the Web of Science (ISI) for papers dated from January 1991 to November 2011. The search was complemented by manual searches of the reference lists from each identified relevant paper. The main search terms were: “degree of conversion”, “monomers”, “polymers”, “composite”, “pre-gel”, “post-gel”, “residual monomers” and “double bond”.Study selection: The inclusion criteria were studies that evaluated consolidated methods in the literature to directly evaluate the degree of conversion. Excluded studies were those considered to be unrelated to the question addressed, such as mechanical and physical properties and also monomers from adhesive systems and compomers. The selected papers were assigned to a score (A, B or C), according to the predetermined criteria. A total of 45 papers were selected and 15 papers were included in the critical appraisal. Two articles were labeled as grade A, nine articles were labeled as grade B, and four articles were labeled as grade C.  Conclusions: According to the definitions of evidence levels, the current article study showed a strong evidence of review. Clinical significance: The monomer´s degree of conversion predicts the quality of polymers.

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Resumen: Este artículo describe las características y los primeros resultados del sistema RBX, nuevo radar de apertura sintética aerotransportado que ha sido desarrollado en el Instituto Nacional de Técnica Aeroespacial. El nuevo sistema soporta resoluciones submétricas con capacidades interferométricas y polarimétricas. La arquitectura del sistema se ha diseñado teniendo en cuenta la facilidad de incorporar mejoras y la calidad de los datos adquiridos, incluyendo múltiples lazos de calibración interna.Palabras clave: SAR (Radar de Apertura Sintética), radar aerotransportado, calibración, procesado radar. RBX: the new X-band saR system from intaAbstract: This paper describes the characteristics and the first results of the RBX system, the new airborne Synthetic Aperture Radar developed at Spanish National Institute of Aerospace Technology. The new system supports submetric resolution with interferometric and polarimetric capabilities. The system architecture has been designed taking into account an easy upgrade ability and the quality of the acquired data, including multiple internal calibration loops.Key words: Synthetic Aperture Radar, Airborne Radar, Calibration, Radar Processing.* Autor para la correspondencia: sudujr@inta.es IntroducciónEl sistema RBX, que sustituye al RIX (el anterior prototipo operativo de desarrollo de tecnología radar del instituto), permite poder alcanzar el estado del arte de los radares SAR aerotransportados tanto en resolución como en modos de operación y calidad de datos que permita continuar en la investigación y desarrollo de dicha tecnología (González Bonilla, M. J. et al. 2009).El sistema va montado en la plataforma aérea de investigación del INTA EADS/CASA C-212 y se ha diseñado para facilitar futuras mejoras y modificaciones ya sea para adaptar el radar a nuevos requisitos o para proporcionar nuevas funcionalidades.Otro de los objetivos del sistema ha sido el asegurar la calidad de los datos adquiridos. Para ello, se han incluido varios lazos de calibración así como comprobaciones de las condiciones operativas del radar.caso práctico