Browsing by Author "Calle Cabrera, Viviana Carolina"

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Filtración marginal con ionómero de vidrio y compómero en molares temporarios en pacientes de 5-10 años
(Universidad de Cuenca, 2020-11-13) Calle Cabrera, Viviana Carolina; Salamea Guevara, Cinthya Coralia; Moreno Morejón, Gladys Eugenia
Objective: The aim of this research was to compare the clinical features between glass ionomer (Ionolux, Vocco) versus compomer (TwinkyStar, Vocco) in temporary molars to avoid marginal leakage in children aged 5-10 years. Materials and methods: A cohort study, prospective, with settled population and quantitative approach. The sample consisted of 22 patients aged 5 to 10 years from Cuenca University School of Dentistry. 44 seals were made two in each participant, one based on glass ionomer and another based on compomer with multiple controls for 5 months. Clinical evaluations followed the modified criteria of the United State Public Health Service (USPHS). Data were processed in EXCEL and SPSS with the Kendall Tau C test. Results: The clinical characteristics between the glass ionomer and the compomer were similar, no statistically significant differences were observed in relation to visible spaces, restoration, anatomical shape, discoloration, presence of tooth decay in the restoration margin, surface texture and postoperative sensitivity among them. The glass ionomer showed statistically significant differences from three to five months in terms of marginal integrity (p 0.029). Conclusions: Both materials have acceptable characteristics of marginal integrity and surface texture, therefore, their use in deciduous teeth is recommended. None of these materials produced postoperative sensitivity.
Fracture Resistance Analysis of CAD/CAM Interim Fixed Prosthodontic Materials: PMMA, Graphene, Acetal Resin and Polysulfone
(2023) Abad Coronel, Cristian Gustavo; Calle Cabrera, Viviana Carolina; Abril Orellana, Gabriela Alexandra; Paltán Zhingre, César Antonio; Fajardo Seminario, Jorge Isaac
The aim of this study was to evaluate and compare the fracture resistance of temporary restorations made of polymethylmethacrylate (PMMA), graphene-modified PMMA (GRA), acetal resin (AR) and polysulfone (PS) obtained by a subtractive technique (milling) using a computer-aided design and manufacturing (CAD/CAM) system of a three-unit fixed dental prosthesis (FDP). Methods: Four groups of ten samples were fabricated for each material. Each specimen was characterized by a compression test on a universal testing machine, all specimens were loaded to fracture and the value in Newtons (N) was recorded by software connected to the testing machine. The fracture mode was evaluated on all samples using a stereomicroscope. Results: There were statistically significant differences (p value < 0.005) between PMMA and the other three materials (PMMA: 1302.71 N; GRA: 1990.02 N; RA: 1796.20 N; PS: 2234.97). PMMA presented a significantly lower value than the other materials, and PS showed the highest value. GRA and RA presented a similar range of values but they were still higher than those of PMMA. Conclusions: GRA, RA and PS are presented as valid options within the range of interim milled restorative materials and as alternatives to PMMA.