RESUMO
Objective: This study aimed to evaluate the bond strength of a universal adhesive to dentin (µTBS) using different time periods of airborne particle abrasion (APA) and two types of acid etching. Methods: Seventy-two human third molars were divided into 9 groups (n=8) according to dentin pretreatment: APA duration (0, 5, or 10s) and acid etching (no acid - NA, 37% phosphoric acid - PhoA, or 1% phytic acid - PhyA). APA was performed at a 0.5 cm distance and air pressure of 60 psi using 50 µm aluminum oxide particles. Afterwards, two coats of Single Bond Universal adhesive (3M) were applied to the dentin surface. Composite blocks were built using the incremental technique, sectioned into 1×1 mm slices and subjected to microtensile bond strength (µTBS) testing. Fracture patterns and surface topography of each dentinal pretreatment were evaluated using a Scanning electron microscope (SEM). Bond strength data were analyzed using two-way ANOVA and Bonferroni post-hoc tests. Results: The group that received pretreatment with 5s APA and PhoA presented higher µTBS values among all groups, which was statistically different when compared with the PhoA, 10APA+PhoA, and 5APA+PhyA groups. PhyA did not significantly influence the bond strength of the air-abraded groups. Finally, adhesive failure was considered the predominant failure in all groups. Conclusion: Dentin pretreated by airborne particle abrasion using aluminum oxide demonstrated an increase in bond strength when abraded for 5 seconds and conditioned with phosphoric acid in a universal adhesive system.
RESUMO
RESUMEN Objetivo: Analizar la asociación entre caries dental de madres y de sus hijos menores de 72 meses del Centro de Crecimiento y desarrollo- Lactancia materna del Hospital Nacional Cayetano Heredia en la ciudad de Lima, Perú. Materiales y métodos: Este estudio fue analítico, observacional, y transversal. Y se realizó sobre una muestra de 102 pares madre-hijo, los niños fueron menores de 72 meses de edad. Se realizaron exámenes bucales a ambos y se buscó asociación entre prevalencia de caries dental y experiencia de caries dental con otras variables como edad, sexo y grado de instrucción. Se empleó la prueba estadística de Chi-cuadrado corregida por Yates y Fisher. El estudio contó con un nivel de confianza de 95% y un p<0,05. Resultados: La prevalencia de caries dental en madres fue de 59.8% y en los niños de 9,8%. En cuanto a la experiencia de caries dental, las madres tuvieron un CPOD promedio de 6,8 y un CPOS de 16,7. Los niños tuvieron un ceod promedio de 0,3, y el mismo valor para el ceos. Conclusión: No existió asociación entre caries dental de la madre y sus hijos menores de 72 meses del Centro de Desarrollo y Crecimiento - Lactancia materna en el Hospital Nacional Cayetano Heredia, Lima- Perú.
SUMMARY Objective: Analyze the association between dental caries in mothers y and their children under 72 months old from the Center of Growth and Development- Breastfeeding in the Hospital Nacional Cayetano Heredia in Lima, Peru. Materials and methods: This study was analytical, observational and cross- sectional. The analysis was made with a sample of 204 subjects, 102 pairs of mothers-children, the children were under 72 months old. Oral examinations were performed to the mothers and their children, we tried to associate the prevalence of dental caries and dental caries experience with other variables such as age, sex and level of education. Chi- Square corrected by Yates and Fisher was used as a statistical test. The study had a 95% of confidence level and p<0.05. Results: The prevalence of dental caries in mothers was 59.8% and in their children 9.8%. The mothers had an average of 6.8 DMFT and DMFS of 16.7 in dental caries. The children had an average of 0.3 ceod with the same value for the ceos. Conclusions: There was no association between dental caries in mothers and their children under 72 months of the Growth and Development Center - Breastfeeding in the Hospital Nacional Cayetano Heredia, Lima- Peru.
