Browsing by Author "Abril Ochoa, Diana Gabriela"

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Evaluación de la posición hioidea en radiografías de pacientes clase I, II y III esqueletales entre 9 y 18 años de edad registrados en el período 2012 y 2015, de un Centro Radiológico de la Ciudad de Cuenca
(2016) Abril Ochoa, Diana Gabriela; Barzallo Sardi, Vinicio Egidio
Objective: The aim of this study was to evaluate the hyoid bone position in different skeletal patterns by cephalometric tracing of the hyoid triangle according to Bibby and Preston. Stablishing differences between skeletal malocclusions. Materials and methods: In this study 161 lateral cehalograms corresponding to patients of both sexes (75 men and 86 women) with ages ranging from 9 to 18 years, were divided into three subgroups (Class I, Class II and Class III) according to APDI and ANB angles. The anteroposterior, vertical and angular position of the hyoid bone was determined by cephalometric tracing of the hyoid triangle. Skull, cervical vertebrae and hyoid bone were the anatomical structures delineated by the lines and planes traced according to Bibby and Preston. Standard measures for each skeletal class were obtained. Results: Statistically significant difference was found regarding the measure H-RGn (p< 0,05) among Class I and II; Class II and III. The value of the Hyoid plane angle shows significant differences between class I and II and between Class II and III (p<0,005). Male and female individuals with skeletal class I presented significant differences for the measure H-RGn (p<0,005). The angular position of the hyoid bone showed statistically significant differences between age groups in the three skeletal classes (p<0,005). Conclusions: It concluded itself that the positioning of hyoid bone was variable in different skeletal patterns. However, its position in relation to the cervical spine has less variability than its relationship to the mandible. It is important to consider sexual dimorphism when evaluating hyoid position, as well as changes in position in individuals who are growing. It´s important to consider the sexual dimorphism in the analysis of the hyoid bone position, as well as changes in its position in individuals who are growing
Fracture resistance analysis of CAD/CAM interim fixed prosthodontic materials: pmma, graphene, acetal resin and polysulfone
(Universidad de Cuenca, 2023-12-11) Calle Barros, Marcia Carolina; Abril Ochoa, Diana Gabriela; Abad Coronel, Cristian Gustavo
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). Meth- ods: 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.