Para alcanzar el éxito de un tratamiento de endodoncia es fundamental tener el conocimiento de la morfología de la cámara y los conductos pulpares; es por ello, que el propósito de la presente investigación fue analizar la morfología externa e interna de las primeras premolares inferiores por medio de la tomografia computarizada de haz cónico. Con la finalidad de describir la anatomía interna radicular se realizó un estudio descriptivo, transversal y analítico en 82 primeras premolares inferiores previamente colocadas en mauetas, por medio de tomografias computarizadas de haz cónico, en el Centro de Diagnóstico por Imágenes. Se realizó la descripción de la forma del conducto en apical, el número de conductos, y la forma del conducto según la clasificación de V ertucci. Para realizar el estudio comparativo entre los grupos se utilizó la prueba de Chi-cuadrado. Se conclu...

Objective: The purpose of the study was to compare the precision of the Propex Pixi and Raypex 6 electronic apical locators in determining the working length of teeth with simulated perforations at different levels of the root canal. Materials and Methods: 36 uniradicular lower premolars were used with a canal randomly divided into three groups of 12 teeth each. In the first group two simulated perforations were made at the middle and apical level. In the second group a simulated cervical perforation was made, and in the third group a simulated perforation was performed at the apical level. Two electronic apical locators Propex Pixi and Raypex 6 were used, and the real length of the canal was measured with a digital Vernier caliper. Descriptive and inferential statistics were applied with the Friedman test at a confidence level of 95%. Results: When comparing the precision of the lengths...

External cervical resorption is a pathological process, with an etiology that is not completely understood. Possible predisposing factors are orthodontic treatment, trauma, internal whitening, bruxism, etc. Internal whitening is an effective and minimally invasive method for the whitening non-vital teeth. This method is associated with a risk of resorption, which if not treated, can lead to tooth loss. This case report describes the management of two upper incisors with external cervical resorption, with a previous history of root canal treatment and internal whitening.