Análisis comparativo de forma y grado de desviación de dos diferentes técnicas de instrumentación: LSX y Protaper Next.

INTRODUCCIÓN: La anatomía radicular es muy compleja, en algunos casos el fracaso endodóntico se debe al desconocimiento de la misma. La aparición de numerosos sistemas de instrumentación mecanizada, impone la necesidad de investigar su comportamiento en los conductos radiculares con la finalidad de evaluar las ventajas del instrumento, las limitaciones y el riesgo de desgaste excesivo al final de la instrumentación. OBJETIVOS: Evaluar la transportación y conformación de los conductos radiculares, utilizando dos sistemas de instrumentación rotatoria: LSX y Protaper Next, con CBCT. MATERIALES Y MÉTODOS: Se trabajaron 40 conductos de 20 molares extraídas del humano que fueron seleccionadas en base a los criterios de inclusión RESULTADOS: El análisis estadístico demostró que El Sistema LSX resultó con la mayor conformación de conductos circulares en el 100% de los casos en los conductos MB, tanto a 2 mm. como a 5 mm.Mientras que el Sistema ProTaper Next conformó de manera circular sólo el 80% de los conductos MB, pero sólo a 2 mm. CONCLUSIONES: Por los resultados obtenidos en la presente investigación se concluye que Ambos sistemas tienen un grado de desviación muy bajo, y no hay diferencia estadísticamente significativa entre ellos. ABSTRACT NTRODUCTION: The root anatomy is very complex, in some cases endodontic failure is due to ignorance of it. The installation of many systems of mechanized instrumentation imposes the need to investigate their behavior in the root canals in order to assess the advantages of the instrument, the limitations and the risk of excessive wear at the end of the instrumentation. AIMS: To evaluate the transportation and conformation of the root canals, using the rotary instrumentation systems: LSX and Protoper Next using CBCT. MATERIALS AND METHODS: RESULTS: The statistical analysis showed that the LSX system resulted in the greatest conformation of circular ducts in 100% of the cases in the MB ducts, both at 2 mm. as a 5 mm. While the following ProTaper System circularly shaped only 80% of the MB conduits, but only 2 mm. CONCLUSIONS: By the obtained results in the investigation it was concluded that The results obtained in the present investigation conclude that both systems have a very low degree of deviation, and there is no statistically significant difference between them

Meeting each other’s needs: Collaboration between international students and SMEs : A case study of Ostrobothnia, Finland

Networking has been identified as an essential strategy on job search, and, in many cases, international students’ weak network ties in Finland place them at a disadvantage in finding employment. On the other hand, small and medium-sized enterprises (SMEs) in the Ostrobothnia region looking to improve their internationalization could benefit from international students’ skills and knowledge. This research aimed to determine how international students can help SMEs in Ostrobothnia meet their internationalization needs. The thesis is a case study following the Resource-Based View (RBV) perspective and applying a cross-sectional mixed-methods approach. Academic literature has used the RBV to explain SMEs’ internationalization by considering SMEs’ resources and characteristics linked to success when becoming global. The quantitative data was collected through online questionnaires sent to the member SMEs of the Ostrobothnia Chamber of Commerce. Qualitative data was then gathered through semi-structured interviews with selected companies. Based on the data obtained from the questionnaires and interviews, it can be concluded that SMEs in Ostrobothnia perceive obtaining reliable foreign representation as a major barrier. It can also be stated that there is indeed a willingness from SMEs to collaborate with international students. Nevertheless, this willingness is restricted by the limited economic and time resources from SMEs. Aiming to address this, collaboration models between SMEs and international students should be considered so that SMEs can participate without substantial economic or time investments. Moreover, this study reveals no unique collaboration model but a wide range of possibilities with great potential when certain characteristics are included in the models, namely, Higher Education Institutions (HEIs) involvement, and participation not requiring a significant amount of time economic resources from SMEs. In general, findings from the empirical study section of this thesis are strongly aligned with the existing literature. This research highlighted several interesting aspects of the entrepreneurial environment of the Ostrobothnia region. Still, further research is needed in order to confirm the collaboration model proposal and to compare the findings with other regions in the country

Reabsorción radicular externa. Presentación de un caso clínico.

La resorción externa por presión (RREP) consiste en una pérdida de tejido dentinario y cementario de las raíces dentarias que se origina a nivel del ligamento periodontal, ocasionada por presiones prolongadas y mantenidas sobre la raíz. Presentamos un caso con su repercusión y tratamiento

Tratamiento endodóntico de radix paramolaris.

El primer molar inferior puede mostrar variaciones anatómicas. En la mayoría de los casos la raíz mesial tiene dos conductos y la raíz distal tiene un conducto o dos. Una variación anatómica es una tercera raíz, llamada radis entomolaris si se encuentra en posición distolingual y radix paramolaris si esta en posición mesiobucal.

“CLUPS”: A New Culture Medium for the Axenic Growth of Entamoeba histolytica

Amebiasis remains a major health problem in Mexico. Terefore, the search for better culture media and low-cost diagnostic and therapeutic tools is fundamental. We present a new culture medium for Entamoeba histolytica which allows the microbe to preserve its virulence factors and ability to induce hepatic abscesses in animal models. Te novel CLUPS medium is an improved version of the PEHPS medium, previously designed in our laboratory. Te main diference is the substitution of raw beef liver in PEHPS by raw beef lung in the CLUPS medium. To compare the performance of three-culture media (traditional TYI-S-33, PEHPS, and CLUPS), E. histolytica trophozoites were cultured in quintuplicate, followed by the evaluation of phospholipase activity and the induction of liver abscesses in golden hamsters. E. histolytica trophozoites grew signifcantly better in CLUPS medium than in TYIS-33. Likewise, CLUPS-cultured trophozoites produced signifcantly more phospholipases than TYI-S-33-cultured trophozoites. Finally, trophozoites grown in any of the three tested media had similar potential to induce liver abscesse

Field Effectiveness of Drones to Identify Potential Aedes aegypti Breeding Sites in Household Environments from Tapachula, a Dengue-Endemic City in Southern Mexico

Aedes aegypti control programs require more sensitive tools in order to survey domestic and peridomestic larval habitats for dengue and other arbovirus prevention areas. As a consequence of the COVID-19 pandemic, field technicians have faced a new occupational hazard during their work activities in dengue surveillance and control. Safer strategies to monitor larval populations, in addition to minimum householder contact, are undoubtedly urgently needed. Drones can be part of the solution in urban and rural areas that are dengue-endemic. Throughout this study, the proportion of larvae breeding sites found in the roofs and backyards of houses were assessed using drone images. Concurrently, the traditional ground field technician’s surveillance was utilized to sample the same house groups. The results were analyzed in order to compare the effectiveness of both field surveillance approaches. Aerial images of 216 houses from El Vergel village in Tapachula, Chiapas, Mexico, at a height of 30 m, were obtained using a drone. Each household was sampled indoors and outdoors by vector control personnel targeting all the containers that potentially served as Aedes aegypti breeding sites. The main results were that the drone could find 1 container per 2.8 found by ground surveillance; however, containers that were inaccessible by technicians in roofs and backyards, such as plastic buckets and tubs, disposable plastic containers and flowerpots were more often detected by drones than traditional ground surveillance. This new technological approach would undoubtedly improve the surveillance of Aedes aegypti in household environments, and better vector control activities would therefore be achieved in dengue-endemic countries

Consenso Mexicano de Hepatitis Alcohólica

La hepatitis alcohólica es una condición frecuente en la población mexicana, se caracteriza por insuficiencia hepática aguda sobre crónica, importante reacción inflamatoria sistémica y fallo multiorgánico, que en la variante grave de la enfermedad implica una elevada mortalidad. Por lo anterior, la Asociación Mexicana de Gastroenterología y la Asociación Mexicana de Hepatología conjuntaron un equipo multidisciplinario de profesionales de la salud para elaborar el primer consenso mexicano de hepatitis alcohólica. El consenso fue elaborado con la metodología Delphi, emitiendo 37 recomendaciones. La enfermedad hepática relacionada con el consumo de alcohol comprende un amplio espectro, que incluye esteatosis, esteatohepatitis, fibrosis en diferentes grados, cirrosis y sus complicaciones. La hepatitis alcohólica grave se define por una función modificada de Maddrey ≥ 32 o por un puntaje de MELD (Model for End- Stage Liver Disease) igual o mayor a 21. Actualmente no existe un biomarcador específico para el diagnóstico. La presencia de leucocitosis con neutrofilia, hiperbilirrubinemia (> 3 mg/dL),AST > 50 U/L ( 1.5-2 pueden orientar al diagnóstico. La piedraangular del tratamiento es la abstiencia junto con el soporte nutricional. Los esteroides estanindicados en la forma grave, en donde han resultado efectivos para reducir la mortalidad a28 días. El trasplante hepático es en la actualidad la única opción con que se cuenta parasalvar la vida de pacientes que no responden a los esteroides. Ciertos fármacos, como la N-acetilcisteína, el factor estimulante de colonias de granulocitos y la metadoxina, pueden seruna terapia adyuvante que puede mejorar la supervivencia de los pacientes

The Mexican consensus on alcoholic hepatitis

Alcoholic hepatitis is a frequent condition in the Mexican population. It is characterized by acute-on-chronic liver failure, important systemic inflammatory response, and multiple organ failure. The severe variant of the disease implies elevated mortality. Therefore, the Asociación Mexicana de Gastroenterología and the Asociación Mexicana de Hepatología brought together a multidisciplinary team of health professionals to formulate the first Mexican consensus on alcoholic hepatitis, carried out utilizing the Delphi method and resultingin 37 recommendations. Alcohol-related liver disease covers a broad spectrum of patholo-gies that includes steatosis, steatohepatitis, different grades of fibrosis, and cirrhosis and itscomplications. Severe alcoholic hepatitis is defined by a modified Maddrey’s discriminant func-tion score ≥ 32 or by a Model for End-Stage Liver Disease (MELD) score equal to or above 21.There is currently no specific biomarker for its diagnosis. Leukocytosis with neutrophilia, hyper-bilirubinemia (>3 mg/dl), AST > 50 U/l ( 1.5-2 can guide thediagnosis. Abstinence from alcohol, together with nutritional support, is the cornerstone oftreatment. Steroids are indicated for severe disease and have been effective in reducing the28-day mortality rate. At present, liver transplantation is the only life-saving option for patientsthat are nonresponders to steroids. Certain drugs, such as N-acetylcysteine, granulocyte-colonystimulating factor, and metadoxine, can be adjuvant therapies with a positive impact on patientsurvival