Introducción: El consumo de bebidas azucaradas (SSB) se ha relacionado con un incremento en el Índice de Masa Corporal (IMC), lo cual sería especialmente preocupante en poblaciones con un potencial de exposición prolongada, tales como estudiantes. Objetivo: Evaluar la relación entre el consumo calórico proveniente de SSB medido mediante el cuestionario Bevq-15 e IMC en estudiantes de carreras de ciencias de la salud de una universidad peruana. Materiales y métodos: Estudio transversal analítico en base a la medición del consumo calórico de 15 bebidas mediante la administración del cuestionario BEVQ-15 y la toma de medidas antropométricas a universitarios durante 2018 - 2019. Se evaluó la asociación cruda y ajustada usando modelos de regresión lineal. Resultados: Se incluyó a 350 personas. La mediana fue de 21 años y el 58.29% fueron mujeres. La mediana del IMC fue de 24.00 (21.75 - 26.90). El consumo promedio de calorías provenientes de bebidas azucaradas fue de 25.35 kcal/día. Se asoció un IMC menor con el sexo femenino (p<0.001), la carrera de nutrición (p=0.002) y nunca haber consumido tabaco (p=0.027). Se asoció un IMC mayor a la dislipidemia (p=0.014) y a un mayor consumo de calorías diarias provenientes de SSB (p<0.001). En el análisis multivariado se encontró asociación significativa entre el consumo de calorías provenientes de SSB y el IMC, ajustado por edad, sexo y tabaquismo (coeficiente β: 0.68; IC95% 0.04-1.33; p=0.037). Conclusiones: Se encontró asociación entre el consumo de calorías derivadas de SSB y un mayor IMC. Se debe impulsar intervenciones destinadas a la disminución de su consumo en estudiantes. / Introduction: The consumption of sugar sweetened beverages (SSB) has been related to an increase in the Body Mass Index (BMI), which would be especially worrisome in populations with a prolonged exposure potential, such as students. Objective: To evaluate the relationship between the caloric intake from SSB measured by the Bevq-15 questionnaire and BMI in health sciences students at a Peruvian university. Materials and methods: Cross-sectional analytical study based on the measurement of the caloric consumption of 15 beverages based on the administration of the BEVQ-15 questionnaire and the measurement of college students’ anthropometric measurements during 2018-2019. The crude and adjusted association were evaluated using linear regression models. Results: We enrolled 350 participants. The median age was 21 years and 58.29% were women. The median BMI was 24.00 (21.75 - 26.90). The average consumption of calories from SSB was 25.35 kcal/day. A lower BMI was associated with the female sex (p <0.001), the nutrition career (p = 0.002) and never having used tobacco (p = 0.027). A higher BMI was associated with dyslipidemia (p = 0.014) and a greater consumption of daily calories from SSB (p <0.001). In the multivariate analysis, a significant association was found between the consumption of calories from SSB and BMI, adjusted for age, sex and smoking (β coefficient: 0.68, 95% CI 0.04-1.33, p = 0.037). Conclusions: An association was found between the consumption of calories derived from SSB and a higher BMI. Interventions aimed at reducing student consumption should be promoted. / Tesis

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / PURPOSE: To assess the long-term effect of a 2% aqueous chlorhexidine (CHX) solution on bond strength to artificially eroded dentin compared to sound dentin. MATERIALS AND METHODS: Flat mid-coronal dentin surfaces of extracted third molars (n = 28) were subjected only to grinding with a 600-grit SiC paper for 1 min (sound dentin S, n = 14) or additionally to erosive pH cycling with a cola-based soft-drink (eroded dentin E, n = 14). After acid etching, rinsing, and air drying, S and E were rehydrated with 1.5 μl of 2% CHX (S2%, n = 7; E2%, n = 7) or of distilled water (control SC, n = 7; EC, n = 7). Composite buildups were incrementally constructed with Filtek Z350 following Adper Single Bond 2 application. Specimens were sectioned into beams, which were subjected to microtensile testing immediately or after 6 or 12 months of aging. Fractured surfaces were observed under a digital microscope (50X magnification). Microtensile bond strength (μTBS) (MPa) was analyzed by three-way ANOVA and Tukey's tests (α = 0.05) and failure mode by the Kruskal-Wallis test (α = 0.05). RESULTS: Compared to sound dentin, eroded dentin was consistently related to lower μTBS. Immediately and after 12-month aging, the effect of CHX was insignificant, but it was significant after 6-month aging, when it conserved the bond strength to both eroded and sound dentin. The percentage of adhesive and mixed failures were equivalent, and significantly more frequent than cohesive failures, whether in dentin or in composite. CONCLUSION: The 2% CHX effect on bond strength conservation to both eroded and sound dentin was not found to be persistent. / Revisión por pares

El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado. / PURPOSE: To assess the influence of simulated oral erosive/abrasive challenges on the bond strength of an etch-and-rinse two-step bonding system to enamel using an in situ/ex vivo protocol. METHODS: Bovine enamel blocks were prepared and randomly assigned to four groups: CONT - control (no challenge), ABR - 3x/day-1 minute toothbrushing; ERO - 3x/day - 5 minutes extraoral immersion into regular Coca Cola; and ERO+ABR - erosive protocol followed by a 1-minute toothbrushing. Eight blocks were placed into an acrylic palatal appliance for each volunteer (n = 13), who wore the appliance for 5 days. Two blocks were subjected to each of the four challenges. Subsequently, all the blocks were washed with tap water and Adper Single Bond 2/Filtek Z350 were placed. After 24 hours, 1 mm2 beams were obtained from each block to be tested with the microtensile bond strength test (50 N load at 0.5 mm/minute). The data were statistically analyzed by one-way RM-ANOVA and Tukey's tests (alpha = 0.05). RESULTS: No difference was detected among the ABR, ERO, and CONT groups (P > 0.05). ERO+ABR group yielded lower bond strengths than either the ABR and ERO groups (P < 0.0113). / Revisión por pares