Factores de riesgo locales y recesión periodontal de dientes anteriores en niños de 10 a 14 años

Introduction: there are many risk factors that are related to periodontal recession, which currently constitutes a health problem.Objective: to determine the presence of local risk factors in periodontal recession of anterior teeth in children aged 10-14 years at the "Ismael Clark y Mascaró" dental clinic in Camagüey from September 2019 - December 2022.Methodology: qualitative-quantitative study, as well as explanatory and correlational. The universe was 80 patients and the sample consisted of 30 patients with a pure purposive non/probabilistic sampling who met the inclusion criteria. A form was prepared that relates the study variables. The information was processed in the SPSS 21,0 package.Results: the female sex predominated, with a slight degree of apical migration, mainly in the lower anterior sector. The most affected teeth were 31 and 41. The predominant degree of apical migration was 1-3 mm in the lower anterior sector. All variables were significant. The phrenic and muscular insertions represented the best predictor.Conclusions: the behavior of local risk factors in periodontal recession at the "Ismael Clark y Mascaró" dental clinic was determined. All the variables were significant. The phrenic and muscular insertions represented the best predictor.Introducción: muchos son los factores de riesgo que se relacionan con la recesión periodontal, identificar aquellos que más inciden es vital, lo cual constituye actualmente un problema de salud.Objetivo: determinar la presencia de factores de riesgo locales en la recesión periodontal de dientes anteriores en niños de 10-14 años en la clínica estomatológica “Ismael Clark y Mascaró” de Camagüey desde septiembre 2019 - diciembre 2022.Metodología: estudio cuali-cuantitativo, así como explicativo y correlacional. El universo fue de 80 pacientes y la muestra estuvo conformada por 30 pacientes a partir de una selección de muestreo intencional puro no probabilístico de aquellos que cumplieron con los criterios de inclusión. Con aportes significativoCSe elaboró un formulario que relaciona las variables del estudio. La información se procesó en paquete SPSS 21,0.Resultados: predominó el sexo femenino, con grado de migración apical leve principalmente en sector anteroinferior. Los dientes más afectados resultaron el 31 y 41. El grado de migración apical predominante fue de 1-3 mm en sector anteroinferior. Todas las variables fueron significativas. Las inserciones frénicas y musculares representaron la mejor predictora.Conclusiones: se determinó el comportamiento de los factores de riesgo locales en la recesión periodontal en la clínica estomatológica “Ismael Clark y Mascaró”. Todas las variables resultaron significativas. Las inserciones frénicas y musculares representaron la mejor predictora

A search for ultra-high-energy photons at the Pierre Auger Observatory exploiting air-shower universality

The Pierre Auger Observatory is the most sensitive detector to primary photons with energies above ∼0.2 EeV. It measures extensive air showers using a hybrid technique that combines a fluorescence detector (FD) with a ground array of particle detectors (SD). The signatures of a photon-induced air shower are a larger atmospheric depth at the shower maximum (X$_{max}$) and a steeper lateral distribution function, along with a lower number of muons with respect to the bulk of hadron-induced background. Using observables measured by the FD and SD, three photon searches in different energy bands are performed. In particular, between threshold energies of 1-10 EeV, a new analysis technique has been developed by combining the FD-based measurement of X$_{max}$ with the SD signal through a parameter related to its muon content, derived from the universality of the air showers. This technique has led to a better photon/hadron separation and, consequently, to a higher search sensitivity, resulting in a tighter upper limit than before. The outcome of this new analysis is presented here, along with previous results in the energy ranges below 1 EeV and above 10 EeV. From the data collected by the Pierre Auger Observatory in about 15 years of operation, the most stringent constraints on the fraction of photons in the cosmic flux are set over almost three decades in energy

Study on multi-ELVES in the Pierre Auger Observatory

Since 2013, the four sites of the Fluorescence Detector (FD) of the Pierre Auger Observatory record ELVES with a dedicated trigger. These UV light emissions are correlated to distant lightning strikes. The length of recorded traces has been increased from 100 μs (2013), to 300 μs (2014-16), to 900 μs (2017-present), to progressively extend the observation of the light emission towards the vertical of the causative lightning and beyond. A large fraction of the observed events shows double ELVES within the time window, and, in some cases, even more complex structures are observed. The nature of the multi-ELVES is not completely understood but may be related to the different types of lightning in which they are originated. For example, it is known that Narrow Bipolar Events can produce double ELVES, and Energetic In-cloud Pulses, occurring between the main negative and upper positive charge layer of clouds, can induce double and even quadruple ELVES in the ionosphere. This report shows the seasonal and daily dependence of the time gap, amplitude ratio, and correlation between the pulse widths of the peaks in a sample of 1000+ multi-ELVES events recorded during the period 2014-20. The events have been compared with data from other satellite and ground-based sensing devices to study the correlation of their properties with lightning observables such as altitude and polarity