Effect of Materials For Interim Restoration on Estimation of Working Length Using Electronic Apex Locator: in vitro Study

ABSTRACT: The aim of this in vitro study was to evaluate measurement accordance using an electronic apex locator for estimation of working length in endodontics when different restorative materials for interim crown restoration are utilized. For this study, 13 single-rooted premolars with endodontic occlusal access cavity were prepared. To establish the working length of each tooth, these were mounted in alginate and with the help of an electronic foramen locator and endodontic file K-file # 15, the working length was established. This length was later compared to the estimated working lengths using different intermediate restoration materials. These materials were: Superior Chemfil, Ketac ™ Molar Easymix and Filtek z350 resin. In the electronic measurements, an acceptable tolerance range of variation up to ± 0.5 mm was considered. Highest discrepancies were considered erroneous. For these measurements, central tendency and dispersion were analyzed. The Bland-Altman method was used, and the ANOVA test with a significance level of p <0,05 for statistic difference. Regarding measurements' acceptability and the type of interim restoration material utilized, 7 were acceptable, and 6 were unacceptable for ChemFil Superior, 12 were acceptable and 1 unacceptable for Ketac™ Molar Easymix, and 11 were acceptable and 2 were unacceptable for Filtek Z350 composite resin. The average difference between all electronic measurements was 0.29 (± 0.44). Chemfill Superior showed the most prominent variation between measurements 0.58 (± 0.45). When using an electronic apex locator, measurements showed statistically significant differences depending on the interim restoration material of choice (p<0.05). In conclusion, the measurement accordance using electronic apex locator to estimation the working length is higher, however the electronic estimation of working length can be significatively affected by the material chosen for interim temporary restoration.

RESUMEN: El objetivo de este estudio in vitro, fue evaluar la concordancia de las estimaciones de longitud de trabajo mediante localizador electrónico de foramen, utilizando diferentes materiales de restauración intermedia coronaria. Para tales fines fueron preparados 13 premolares uniradiculares con cavidad de acceso oclusal endodóntico. Para establecer la a longitud de trabajo de cada diente, estos fueron montados en alginato y con la ayuda de un localizador electrónico de foramen y lima de endodoncia K-file #15 fue establecida la longitud de trabajo. Esta longitud fue comparada posteriormente con las longitudes de trabajo estimadas utilizando diferentes materiales de restauración in- termedia. Estos materiales fueron: Chemfil superior, Ketac™ Molar Easymix y resina Filtek z350. En las mediciones electrónicas, se consideró un rango de tolerancia aceptable de variación hasta ± 0,5 mm. Las discrepancias mayores se consideraron erróneas. Se calcularon medidas de tendencia central y la dispersión. Se utilizó el método de Bland- Altman y la prueba ANOVA con un nivel de significancia de p <0,05. Con respecto a la aceptabilidad de las mediciones y el tipo de material de restauración intermedia, 7 fueron aceptables y 6 fueron inaceptables para ChemFil Superior, 12 fueron aceptables y 1 inaceptable para Ketac ™ Molar Easymix, y 11 fueron aceptables y 2 fueron inaceptables para el compuesto Filtek Z350 resina. La diferencia promedio entre todas las mediciones electrónicas fue de 0,29 (± 0,44). Chemfil Superior mostró la mayor variación entre medicio- nes 0,58 (± 0,45). Las mediciones mostraron diferencias estadísticamente significativas dependiendo del material de restauración intermedio elegido (p <0,05). En conclusión, la concordancia en la estimación de la longitud de trabajo usando localizador electrónico de foramen es alta, sin embargo, puede verse afectada significativamente por el material de obturación intermedio.

Consultas ambulatorias pediátricas atendidas en el servicio de urgencia de un hospital universitario / Pediatric outpatient consultation at the emergency department of a university hospital

Introducción: Conocer el perfil epidemiológico de las consultas pediátricas atendidas en el servicio de urgencia (SU) es esencial para planificar los procesos de atención médica y orientar los programas de educación e investigación. Objetivos: Describir las características de la población infantil y los principales motivos de consulta (MC) atendidos en un SU pediátrico. Pacientes y Método: Estudio clínico descriptivo retrospectivo de las visitas realizadas a un SU infantil en un hospital académico de Santiago durante un período de doce meses. Se analizaron los MC por grupo etario, gravedad, estacionalidad, forma de egreso y frecuencia de visitas recurrentes. Resultados: Se evaluaron 24.531 consultas pediátricas, 51,9 por ciento (n = 12.720) eran varones. La edad de los pacientes osciló entre un día y 15 años, con una mediana de 36,5 meses. El 1,5 por ciento de los pacientes (n = 362) eran recién nacidos (RN), 17,6 por ciento (n = 4.326) lactantes, 51,9 por ciento (n = 12.725) preescolares y 29 por ciento (n = 7.118) escolares. Los principales MC fueron fiebre (n = 6.643, 28,2 por ciento), síntomas gastrointestinales (n = 5.606, 23,8 por ciento) y síntomas respiratorios (n = 5.018, 21,3 por ciento), los cuales no difirieron significativamente según género. La mayoría de los pacientes (95,5 por ciento) fueron enviados a su domicilio. El riesgo de hospitalización fue más elevado en los RN y en aquellos que consultaron por ictericia (OR = 7,20; IC 95 por ciento 3,12-16,6), síntomas neurológicos (OR = 6,90; IC 95 por ciento 4,60-10,4) e intoxicaciones (OR = 6,45; IC 95 por ciento 2,82-14,7). Alrededor del 4 por ciento fueron consultas repetidas, especialmente en los RN. Conclusiones: El perfil epidemiológico de las consultas pediátricas atendidas en el SU fue similar al descrito en estudios internacionales. Sin embargo, encontramos una menor tasa de hospitalización a pesar que los pacientes presentaban un perfil de riesgo similar en la admisión al SU.

Introduction: To determine the epidemiological profile of pediatric consultations treated at the emergency department (ED) is essential for planning processes of medical care and to guide education programs and research. Objectives: To describe the characteristics of the child population and the main reasons for consultation (RFC) seen in a pediatric emergency service. Patients and Method: A retrospective, descriptive clinical study was conducted regarding the visits to the Children's Emergency Service of an academic hospital in Santiago, for a period of twelve months. RFC were analyzed by age group, severity, seasonality, disposition and frequency of recurrent visits. Results: 24,531 pediatric consultations were evaluated, 51.9 percent were male (n = 12,720). The age of the patients ranged between one day old and 15 years, with a median age of 36.5 months. 1.5 percent of patients were newborns (NB), 17.6 percent were infants (n = 4,326), 51.9 percent were preschoolers (n = 12,725) and 29 percent were school children (n = 7,118). Major RFC were fever (n = 6,643, 28.2 percent), gastrointestinal symptoms (n = 5,606, 23.8 percent) and respiratory symptoms (n = 5,018, 21.3 percent), which did not differ significantly according to gender. Most patients (95.5 percent) were sent to their homes. The risk of hospitalization was more elevated in NB and in those with jaundice (OR = 7.20, 95 percent CI 3.12 to 16.6), neurological symptoms (OR = 6.90, 95 percent CI 4.60 -10.4) and poisoning (OR = 6.45, 95 percent CI 2.82 to 14.7). About 4 percent were repeat visits, especially in the NB group. Conclusions: The epidemiological profile of pediatric consultations seen at the ED was similar to that described in previous studies. However, a lower rate of hospitalization was found even though the patients had similar risk profile.

Ajuste a la ventilación mecánica guiado por curvas presión-volumen de flujo lento en pacientes con síndrome de distress respiratorio agudo e injuria pulmonar aguda / Mechanical ventilatory parameters guided by the low flow pressure-volume curve in patients with acute lung injury/acute respiratory distress syndrome

Background: Mechanical ventilation may contribute to lung injury and then enhance systemic inflammation. Optimal ventilatory parameters such as tidal volume (V T) and positive end expiratory pressure (PEEP) can be determined using different methods. Low flow pressure volume (P/V-LF) curve is a useful tool to assess the respiratory system mechanics and set ventilatory parameters. Aim: To set V T and PEEP according P/V-LF curve analysis and evaluate its effects on gas exchange and hemodynamic parameters. Materials and methods: Twenty seven patients underwent P/V-LF within the first 72 hours of acute lung injury/acute respiratory distress syndrome (ALI/ARDS). P/V-LF curves were obtained from the ventilator and both lower and upper inflexion points determined. Gas exchange and hemodynamic parameters were measured before and after modifying ventilator settings guided by P/V-LF curves. Results: Ventilatory parameters set according P/V-LF curve, led to a rise of PEEP and reduction of V T: 11.6±2.8 to 14.1±2.1 cm H2O, and 9.7±2.4 to 8.8±2.2 mL/kg (p <0.01). Arterial to inspired oxygen fraction ratio increased from 158.0±66 to 188.5±68.5 (p <0.01), and oxygenation index was reduced, 13.7±8.2 to 12.3±7.2 (p <0.05). Cardiac output and oxygen delivery index (IDO2) were not modified. Demographic data, gas exchange improvement and respiratory system mechanics showed no significant difference between patients with extra-pulmonary and pulmonary ALI/ARDS. There was no evidence of significant adverse events related with this technique. Conclusion: P/V-LF curves information allowed us to adjust ventilatory parameters and optimize gas exchange without detrimental effects on oxygen delivery in mechanically ventilated ALI/ARDS patients.