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[eng] Introduction and aim: Dental reconstruction of endodontic teeth represents a great clinical challenge in restorative dentistry. The biomechanical factors of the tooth to be restored, the position of the tooth in the arch, and the habits and parafunctions of the patient play an important role in the longevity and fractures of endodontic tooth reconstructions. When there are a ferrule allows us to perform adhesive techniques with guaranteed isolation of the operative field, dental restoration should be considered a reliable and long-lasting therapeutic option, even when the loss of tooth structure is severe. The aim of this manuscript is to expose the conservative treatment in a second maxillary premolar with extreme lost structure and apical periodontitis. Clinical case: A 47-year -old woman was referred for the evaluation of extraction of second upper right premolar with extreme coronal destruction and periapical lesion. Conservative treatment was recommended because the destruction of the coronal tissue was supragingival and it was believed that the apical lesion could be resolved with endodontic treatment. Endodontic treatment and adhesive dental reconstruction with elastic fiberglass post (FRC), short fiber-reinforced composite (SFRC) as dentine-replacing material and microhybrid composite was done. Results: In the six-year follow-up, the healing of the periapical lesion is observed, and the dental reconstruction is maintained functionally and esthetically. Conclusion: With the limitations of this clinical case, we can conclude that this type of reconstruction is a therapeutic option to consider in the extreme rehabilitation of endodontic teeth., [spa] Introducción y objetivos: La reconstrucción de dientes endodonciados representa un gran reto clínico en odontología restauradora. Los factores biomecánicos del diente a restaurar, la posición del diente en la arcada y los hábitos y parafunciones del paciente juegan un papel importante en la longevidad y fracturas de las reconstrucciones dentales endodónticas. Cuando existe una férula que nos permite realizar técnicas adhesivas con garantía de aislamiento del campo operatorio, la restauración dental debe considerarse una opción terapéutica fiable y duradera, incluso cuando la pérdida de estructura dental es grave. El objetivo de este manuscrito es exponer el tratamiento conservador en un segundo premolar maxilar con pérdida extrema de estructura y periodontitis apical. Caso clínico: Una mujer de 47 años fue remitida para valoración de extracción de segundo premolar superior derecho con destrucción coronal extrema y lesión periapical. Se recomendó tratamiento conservador porque la destrucción del tejido coronal era supragingival y se creía que la lesión apical podría resolverse con tratamiento endodóntico. Se realizó tratamiento endodóncico y reconstrucción dental adhesiva con poste elástico de fibra de vidrio (FRC), composite reforzado con fibra corta (SFRC) como material de sustitución de la dentina y composite microhíbrido. Resultados: En el seguimiento a seis años se observa la curación de la lesión periapical y la reconstrucción dental se mantiene funcional y estéticamente. Conclusiones: Con las limitaciones de este caso clínico, podemos concluir que este tipo de reconstrucción es una opción terapéutica a considerar en la rehabilitación extrema de dientes endodonciados.

In 1994 production of electrowon copper cathodes in the western world was 939 000 t, out of a total refined copper production of 9 111 000 t. Chilean electrowon cathode production was 202 000 t, with Codelco the main producer. Western world production is expected to rise to 2 341 000 t by 2003 with Latin America (in effect, Chile) by then contributing 1 414 000 t. The solvent extraction and electrowinning route has a number of advantages and, with the advent of biochemical leaching processes, is no longer limited to oxide ores but can be used for some sulphide deposits as well. Stringent impurity control is necessary to ensure that the ductility and conductivity required for copper cables and wires is retained; in 1992 70% of world cathodes fulfilled the LME/Comex requirements for high quality. Current Chilean production is from 13 projects, with 3 more under construction and a number more under consideration., In 1994 production of electrowon copper cathodes in the western world was 939 000 t, out of a total refined copper production of 9 111 000 t. Chilean electrowon cathode production was 202 000 t, with Codelco the main producer. Western world production is expected to rise to 2 341 000 t by 2003 with Latin America (in effect, Chile) by then contributing 1 414 000 t. The solvent extraction and electrowinning route has a number of advantages and, with the advent of biochemical leaching processes, is no longer limited to oxide ores but can be used for some sulphide deposits as well. Stringent impurity control is necessary to ensure that the ductility and conductivity required for copper cables and wires is retained; in 1992 70% of world cathodes fulfilled the LME/Comex requirements for high quality. Current Chilean production is from 13 projects, with 3 more under construction and a number more under consideration.