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To estimate the degree of concordance and consistency in the radiographic and tomographic evaluation of the periapical area. A study of diagnostic tests was designed. Three blind evaluators analyzed radiographic images, which were selected at two different points in time. An oral radiologist and an endodontist determined the second observation moment. The degree of similarity and variability, concordance and consistency for each radiograph was set at 95% confidence. A Kappa coefficient (κ), for radiographic findings and a correlation coefficient of Lin (CCC) for tomographic measurements was established. 12 radiographies and 19 tomographs were evaluated. The intraobserver consistency determined a k= 1 (Almost Perfect) and a CCC from 0.42 to 0.95 (Poor to Substantial) for both observation times. For radiographies, the interobserver concordance did not show changes between the first and second observation. Values include a k= 0.56-0.80 (Moderate to Good) and a CCC with greater degree of agreement, after training, as follows: axial view: CCC 0.86, 95% of Confidence Interval (CI) 0.69-0.94, coronal view: CCC 0.90 95%CI 0.75-0.96, and sagittal view: CCC 0.96, 95%CI 0.90-0.98. The statistical tests estimated the consistency and concordance to observe radiographically and tomographically the periapical tissue in endodontics. Se diseñó un estudio de pruebas diagnósticas para estimar el grado de concordancia y consistencia en la evaluación radiográfica y tomográfica del área periapical. Tres evaluadores ciegos analizaron imágenes radiográficas, que fueron seleccionadas en dos momentos diferentes. El grado de similitud y variabilidad, concordancia y consistencia para cada radiografía se estableció en un 95% de confianza. Se estableció un coeficiente Kappa (κ), para los hallazgos radiográficos y un coeficiente de correlación de Lin (CCC) para las mediciones tomográficas. Se evaluaron 12 radiografías y 19 tomografías. La consistencia intraobservador determinó un k = 1 (casi perfecto) y un CCC de 0,42 a 0,95 (deficiente a sustancial) para ambos tiempos de observación. Para las radiografías, la concordancia entre observadores no mostró cambios entre la primera y la segunda observación. Los valores incluyen un k = 0.56-0.80 (moderado a bueno) y un CCC con mayor grado de acuerdo, después del entrenamiento, de la siguiente manera: vista axial: CCC 0.86, 95% del intervalo de confianza (IC) 0.69-0.94, vista coronal: CCC 0.90 IC del 95% 0,75-0,96 y sagital view: CCC 0,96, IC del 95% 0,90-0,98. Las pruebas estadísticas estimaron la consistencia y concordancia para observar radiográfica y tomográficamente. [ABSTRACT FROM AUTHOR]

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