Durante los procedimientos de preparación del conducto radicular, el potencial de fractura de instrumentos está siempre presente. Cuando un instrumento se fractura, produce ansiedad al tratante, así como, una obstrucción metálica del conducto lo que dificulta aún más la limpieza y conformación. Se debe intentar siempre remover el instrumento fracturado, y si la recuperación no es posible; se debe evaluar la posibilidad de sobrepasarlo. El propósito de este artículo es reportar un caso clínico de remoción de un instrumento endodóntico fracturado en el interior del conducto radicular, mediante la creación de un espacio alrededor del instrumento y con la ayuda de dos limas Hedström que traccionan de él, removiéndolo por completo.

Introduction: Endodontic retreatment seeks reentry to the root canal system to remove all filling material, identification and correction of pathological or iatrogenic defects. Objective: This study aimed to compare the dissolving capacity of eucalyptus oil, orange oil, and distilled water versus three types of endodontic cements. Materials and methods: Two hundred and four stainless steel molds were fabricated, where each cement sample was placed to the edge and left to set in the incubator, simulating normal oral conditions for 7 days. Subsequently, the solubility of each cement was analysed by immersing the samples in eucalyptus and orange oil for ten minutes in a static and ultrasonic environment. The solubility of the cement was evidenced by the difference between the weight before and after contact with the oils, data were statistically analysed with the ANOVA test and the post hoc Tukey bootstrap means test with 1,000 repetitions. Results: The control group and eucalyptus oil having no significant effect (p>0.05), the ultrasonic environment was found to be effective (p<0.05), whereas orange oil had better dissolution effects (p=0.004). Conclusions: The most susceptible cement was Sealapex, while the least soluble was MTA-Fillapex in all the solvents studied.