Objective. To determine the relationship between the height of the periapical lesions adjacent to the maxillary sinus and the thickness of the Schneider membrane evaluated with cone-beam tomography. Materials and Methods. The universe was made up of 2432 tomography scans and a sample of 976, by systematic random sampling, and took into account those that presented any of the variables and/or both. For the relationship analysis, the sample was distributed according to sex, maxillary side, and age; it was formed between 18 and 86 years, in age groups of 18–36 years, 37–48 years, 49–59 years, and 60–86 years. The quantitative variables of the statistic descriptive analysis, hypothesis tests, and Spearman correlation were recorded. Results. A significantly low correlation (p < 0.010) was observed between the periapical lesions and the thickness of the Schneider membrane in women (rho...

Se evaluó la actividad antibacteriana in vitro del Camellia sinensis (té verde) y propóleo en comparación con la clorhexidina al 0.12%, frente al crecimiento de cepas de Streptococcus mutans, éste estudio fue experimental in vitro, longitudinal, prospectivo y comparativo, se colocó discos de difusión sumergidos en propóleo al 10%, 20%, té verde al 10% y 20%, clorhexidina al 0.12% (control positivo) y agua destilada (control negativo) en 15 placas petri, haciendo medición de halos a las 24 y 48 horas; se aplicó las pruebas no paramétricas de Kruskal Wallis para tres grupos independientes y la comparación entre pares independientes, U de Mann Whitney; para muestras independientes y se utilizó la prueba Rangos de Wilcoxon para muestras relacionadas, fueron contrastadas a un nivel de confianza del 95% y nivel de significancia de 5%. A las 24 horas el té verde 10% y clorhexidin...

The use of bleaching agents, despite being a conservative treatment, can cause a decrease in the surface microhardness of dental resins, affecting their aesthetics and performance. The aim of this study was to evaluate the in vitro effect of polishing on the surface microhardness of nanohybrid composite resins that were subjected to bleaching with 35% hydrogen peroxide. Materials and Methods: This cross-sectional, in vitro experimental study consisted of 30 composite resin samples made according to ISO 4049-2019 and divided equally into two groups (A and B) which were subjected to 35% hydrogen peroxide bleaching. Group A was subjected to polishing procedure, whereas group B was the control group. The samples were stored in distilled water at 37°C for 24 h. The Vickers microhardness was determined with a load of 100 g-f for 10 s. The data were analyzed with Student’s t-test for indepen...

The COVID-19 pandemic has generated much concern worldwide. Due to its high transmissibility, many young university students have had to carry out their academic activities in mandatory social isolation, which could generate excessive anxiety. Therefore, the aim of this study was to evaluate the anxiety levels in Peruvian dentistry students developed during COVID-19 mandatory social isolation. Materials and Methods: An analytical, observational, and transversal study was carried out in 403 dentistry students in the last two years from three Peruvian universities from May to July 2020. The Zung Self-Rating Anxiety Scale was used to detect anxiety symptoms and their respective diagnoses. A logit model was used to evaluate the association of the variables: age group (X1), gender (X2), type of university (X3), and marital status (X4), with the anxiety levels of the students, considering a p-...

Objetivo: evaluar el efecto antibacteriano del peróxido de hidrógeno (H2 O2 ) al 6% comparado con hipo clorito de sodio (NaClO) al 1% y al 2%, sobre cepillos dentales inoculados con Streptococcus mutans atcc® 25175™. Materiales y métodos: estudio experimental in vitro, transversal y comparativo. Se utilizaron 60 cepillos dentales, divididos en 4 grupos de 15 cepillos cada uno. El número de muestra lo determinó la fór mula de comparación de medias, después de realizar un estudio piloto, y se seleccionaron por muestreo aleatorio simple. Se aplicaron las pruebas de normalidad de Shapiro-Wilk, y para la prueba de hipótesis, la U de Mann-Whitney. Resultados: el H2 O2 al 6% presentó una media de crecimiento de 2×109 ufc/mL, lo que indica que su efectividad es mayor comparada con el NaClO al 1%, que presentó una media de crecimiento de 4×109 ufc/mL, y esta es menor al NaClO al 2...