Browsing by Author "Armas-Vega, Ana"

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    Clinical evaluation of a new chemically-cured bulk-fill composite in posterior restorations: 6-month multicenter double-blind randomized clinical trial
    (JOURNAL OF DENTISTRY, 2024-10-01) Loguercio, Alessandro D.; Carpio-Salvatierra, B; Ñaupari-Villasante, R; Wendlinger, M; Armas-Vega, Ana; Cavagnaro, S; León, A; Aliaga-Galvez, R; Gutiérrez, MF
    Objective To evaluate the postoperative sensitivity (POS), as well as the clinical performance of posterior restorations using a new chemically-cured bulk-fill composite (Stela Automix and Stela Capsule, SDI) comparing with a light-cured bulk-fill composite after 6 months. Methods Fifty-five participants with at least three posterior teeth needing restoration were recruited. A total of 165 restorations were performed on Class I or Class II cavities. After the application of Stela primer, the chemically-cured composite (Stela Automix or Stela Capsule) was inserted. For the light-cured composite group, a universal adhesive (Scotchbond Universal) was applied with a bulk-fill composite (Filtek One). Participants were evaluated for spontaneous and stimulated POS in the baseline, after 48 h, 7 days, and 6 months. Additionally, each restoration was assessed using the updated version of FDI criteria after 6 months. The differences in the proportions of the groups were compared by Cochran test statistics (α = 0.05). Results Both chemically-cured composites showed a lower risk of POS compared to the light-cured composite at baseline and up to 48 h (p < 0.04). A significantly lower surface luster and texture was observed for the Stela Capsule composite compared to the light-cured bulk-fill composite (baseline and 6 months; p = 0.03). A significant color mismatch was observed for the light-cured bulk-fill composite compared to the chemically-cured composites (baseline and 6 months; p = 0.03). No significant differences were observed in any other item evaluations (p > 0.05). Conclusion Chemically-cured composites exhibit lower postoperative sensitivity and less color mismatch compared to a light-cured bulk-fill composite after 6 months of clinical service. Clinical significance The chemically-cured composites appear to be an appealing option for restoring posterior teeth, as they exhibit lower postoperative sensitivity compared to a light-cured bulk-fill composite, both at baseline and up to 48 h, and less color mismatch.
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    Developmental Enamel Defects in Children from the Southern Region of Ecuador
    (Children, 2022-11-16) Vélez-León, Eleonor; Albaladejo-Martínez, Alberto; Pacheco-Quito, Edisson Mauricio; Armas-Vega, Ana; Delgado-Gaete, Andrés; Pesántez-Ochoa, Doménica; Melo, María
    Developmental defects of enamel (DDEs) are widely observed in children and are related to the appearance of dental caries, malocclusion, tooth sensitivity, and unfavorable esthetic conditions. The objective of this cross-sectional study was to determine the prevalence and distribution of enamel defects present in children aged 6 to 12 years in the provinces located in southern Ecuador. A total of 1606 schoolchildren were examined under the World Health Organization criteria for diagnosis of DDEs. The results are presented using percentage frequency measures and chi-square associations. Some types of DDEs were presented by 50% of the schoolchildren, mainly diffuse opacity, with no statistical differences according to place of residence and/or environment, sex, and age (p > 0.05). In Ecuador, it is necessary to carry out studies on the factors that trigger enamel defects, since they may be associated with the high prevalence of caries already reported in other studies in the country.
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    Dissemination event on research in fluorides and dental fluorosis in Latin America
    (BRAZILIAN JOURNAL OF DEVELOPMENT, 2024-03-11) Armas-Vega, Ana; Fresno, María Consuelo; Gallará, Raquel Vivian; González-Martínez, Farith; Marino, Emeterio; Núñez, Heriberto; Ponce, Rubén Hugo; Salas, Juana Rosmeri; Vélez, María Eleanor; Yévenes, Ismael
    The activities developed in the Dissemination Day of the FONIS SA21I0117 project called “Academic dissemination events of the Faculty of Dentistry of the University of Chile and entities participating in the study with foreign professors” are presented with the Agenda: Research in Fluorides and Dental Fluorosis”. This activity took place on October 18, 19 and 20, 2023 at the Faculty of Dentistry of the University of Chile, Santiago, Chile (1). The activities carried out included a: I) Symposium on “Dental Fluorosis in Latin America”, with the participation of researchers from Argentina, Chile, Colombia, Ecuador, Paraguay and Peru. II) Seminar on “Feeding in children from 0 to 12 months in Chile” and III) Presentation of results of research on “Fluorides” andFluorosis developed in Latin American countries.In the fluorosis Symposium section, six research experiences were presented by researchers from 6 presentations were made from Argentina, Colombia, Chile, Ecuador, Paraguay, and Peru. At the seminar on Nutrition in children under 1 year of age in Chile there were three presentations from three government entities in the country. The presentations of free works on fluorides and fluorosis in Latin America included one work from Argentina, two from Chile, one from Colombia, two from Ecuador, one from Brazil, and one from Peru.As the production of scientific works during the event was extensive and very varied, on this occasion we will present only the expanded summaries of the round table on “Dental Fluorosis in Latin America”.
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    Preparation and Characterization of a Novel Hydroxyapatite-Capsaicin Composite Intended for the In-Office Dental Bleaching Use
    (JOURNAL OF COMPOSITES SCIENCE, 2024-11-29) da Silva, Karine Letícia; Hortkoff, Diego; Favoreto, Michael William; Rezende, Marcia; Mendes Nadal, Jessica; Armas-Vega, Ana; Loguercio, Alessandro D.; Farago, Paulo Vitor
    The aim of this study was to synthetize a hydroxyapatite-capsaicin composite (HAp-CAP) and to evaluate its physicochemical data for further use in hydrogen peroxide in-office dental bleaching gel. The HApCAP was prepared by the precipitation method, performed in a 4:1 ratio using 3.2 g of nano-hydroxyapatite (nano-HAp) and 0.8 g of capsaicin (CAP) in 99.5% ethyl alcohol (q.s.p) and zirconia beads at SpeedMixer®. The HAp-CAP was characterized by morphological, spectroscopic, and thermal analyses. In the following, the HAp-CAP was added to an in-office dental bleaching to test its effect on reducing hydrogen peroxide diffusion into the pulp chamber, as well as the effect in the color alteration during dental bleaching. The HAp-CAP were suitably obtained by the precipitation method, and the results demonstrates that the thermal stability of the CAP is greatly improved after reaction of HAp and CAP. The HAp-CAP into a bleaching gel slightly decreased the amount of hydrogen peroxide inside the pulp chamber and didn’t interfering in the bleaching effectiveness of dental bleaching. The HAp-CAP synthesis and characterization were successfully carried out, and its use in dental materials is a challenging task that needs further study since its addition.
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    Prevalence of Caries According to the ICDAS II in Children from 6 and 12 Years of Age from Southern Ecuadorian Regions
    (International Journal of Environmental Research and Public Health, 2022-06-14) Vélez-León, Eleonor; Albaladejo, Alberto; Cuenca-León, Katherine; Jiménez-Romero, Magaly; Armas-Vega, Ana; Melo, María
    In Ecuador, national data on dental caries are scarce and the detection of incipient enamel lesions has been omitted. The objective of this study was to determine the prevalence of caries in school children aged 6 and 12 years of both sexes, belonging to urban and rural areas of three provinces of the country, using the International Caries Detection and Assessment System (ICDAS II). The sample consisted of 665 children from public schools, examined according to ICDASII. Caries prevalence and caries index were established using ICDAS II 2-6/C-G and ICDAS II 4-6/EG criteria for comparison with WHO indicators. The Mann–Whitney U statistical test was used for comparison of two groups, the effect size was measured with the correlation coefficient. and the Kruskal–Wallis H test (p < 0.05) for multiple comparisons. Caries prevalence exceeded 87% for primary and permanent dentition. There were no significant differences according to province (p ≤ 0.05). The caries index at 6 years was 6.57 and at 12 years 9.21. The SIC was high at 12 years in rural areas. The prevalence of caries in the population studied was high despite the preventive measures established by health agencies.