Two patients attended at the Endodontics Department to evaluate teeth 35 and 46. Both teeth had a history of post placement in a recent endodontic treatment in tooth 46, and 3 months ago in tooth 35, with evident large perforations in the middle third of their roots. In both cases, perforation sealing was recommended. The posts were removed and white MTA Angelus (Angelus, Londrina, PR, Brazil) was placed in the perforations of both cases. Finally, the root canals were obturated using the continuous wave technique. The 6-month, 2-year and 6-years follow-ups (tooth 35), and 3-month, 1-year and 3-year follow-ups (tooth 46) showed a favorable evolution. It can be concluded that the application of MTA in iatrogenic perforations promoted good results, allowing the maintenance of the teeth in function.

Objetivos: Describir las características macroscópicas, microscópicas y la caracterización del material de ins- trumentos rotatorios de Níquel-Titanio (NiTi), ProTaper Universal, en comparación con instrumentos similares de dudosa procedencia. Material y métodos: El análisis macroscópico se realizó a través de fotografía macro de las cajas e instrumentos. Para el análisis microscópico, se utilizaron los instrumentos S1 y F1, los cuales fueron seccionados y analizados a través de microscopia electrónica de barrido comparando partes activas y secciones transversales con magnificación de 500X y 400X. Adicionalmente, se realizó la caracterización de los fragmen- tos, a través de microanálisis por dispersión de energías de rayos-X (EDX). Resultados: Al análisis macroscópico, las cajas de los sistemas presentaron diferencias en el diseño y especificaciones, los vásta...

Objective. To evaluate the solubility and the volumetric and morphological alterations of bioceramic filling material (Bio-CP) for primary teeth. Materials and Methods. Bio-CP, Calen thickened with zinc oxide (Calen-ZO), and with zinc oxide eugenol (ZOE) were placed in 1- or 2-mm-diameter polyethylene tubes and immersed in water or phosphate-buffered saline (PBS) for 30 days. The solubility (mass loss) was assessed using methodology modified from ISO 6876. Filling capacity, volumetric changes, and presence of voids were assessed by microcomputed tomography (micro-CT). The surface distribution of the chemical elements and the crystalline phases was evaluated by energy scattering X-ray scanning electron microscopy (SEM-EDX) and X-ray diffraction (XRD) to detect hydroxyapatite precipitate and components. The Shapiro-Wilk, Kruskal-Wallis, and Dunn's or two-way ANOVA and Tukey post hoc test w...