Browsing by Author "Ulloa Wilches, Ana Liz"

Now showing 1 - 3 of 3

Comparative fracture resistance analysis of translucent monolithic zirconia dioxide milled in a CAD/CAM system
(Universidad de Cuenca, 2023-12-12) Paladines Díaz, María de los Ángeles; Ulloa Wilches, Ana Liz; Larriva Loyola, Jaime Alejandro
The aim of this study was to evaluate and compare the fracture resistance of definitive zirconia dioxide restorations obtained using a computer-aided design and manufacturing (CAD/CAM) system. Methods: Two groups of ten samples were analyzed for each material (n: 20); the first group was Zolid Gen X Amann Girrbach (ZGX) and the second group was Cercon HT Dentsply Sirona (CDS). The restorations were designed with identical parameters and milled with a CAD/CAM system. Each specimen was load tested at a speed of 0.5 mm/min, with a direction parallel to the major axis of the tooth and with an initial preload of 10 N until fracture using a universal testing machine (Universal/Tensile Testing Machine, Autograph AGS-X Series) equipped with a 20 kN load cell. The results obtained were recorded in Newtons (N), using software connected to the testing machine. Results: Statistically significant differences were found, and the fracture resistance of the monolithic zirconia crowns was lower in the CDS group (1744.84 ± 172.8 N) compared to the ZGX group (2387.41 ± 516 N). Conclusions: The monolithic zirconia CAD-CAM zirconia crowns showed sufficient fracture resistance when used in posterior molar and premolar zones with either material, as they withstood fracture loads greater than the maximum masticatory force.
Comparative Fracture Resistance Analysis of Translucent Monolithic Zirconia Dioxide Milled in a CAD/CAM System
(2023) Ulloa Wilches, Ana Liz; Fajardo Seminario, Jorge Isaac; Abad Coronel, Cristian Gustavo; Paladines Diaz, Maria De los angeles; Paltán Zhingre, César Antonio
The aim of this study was to evaluate and compare the fracture resistance of definitive zirconia dioxide restorations obtained using a computer-aided design and manufacturing (CAD/CAM) system. Methods: Two groups of ten samples were analyzed for each material (n: 20); the first group was Zolid Gen X Amann Girrbach (ZGX) and the second group was Cercon HT Dentsply Sirona (CDS). The restorations were designed with identical parameters and milled with a CAD/CAM system. Each specimen was load tested at a speed of 0.5 mm/min, with a direction parallel to the major axis of the tooth and with an initial preload of 10 N until fracture using a universal testing machine (Universal/Tensile Testing Machine, Autograph AGS-X Series) equipped with a 20 kN load cell. The results obtained were recorded in Newtons (N), using software connected to the testing machine. Results: Statistically significant differences were found, and the fracture resistance of the monolithic zirconia crowns was lower in the CDS group (1744.84 172.8 N) compared to the ZGX group (2387.41 516 N). Conclusions: The monolithic zirconia CAD-CAM zirconia crowns showed sufficient fracture resistance when used in posterior molar and premolar zones with either material, as they withstood fracture loads greater than the maximum masticatory force.
Prevalencia del defecto de stafne en los Centros Radiológicos de las facultades de Odontología de la ciudad de Cuenca
(2016) Pinos Gavilanes, Daniel Esteban; Ulloa Wilches, Ana Liz; Bravo Calderón, Diego Mauricio
The Stafne bone defect is an asymptomatic radiolucent entity of the mandibular bone that was first described by Edward Stafne in 1942 and is easily confused with cysts and odontogenic tumors. Additionally, we did not find information related to its frequency in our population, hence the present study analyzed the prevalence of this defect at the radiological centers of the Dentistry Schools in the city of Cuenca, which are important dental care centers. Demographic and radiological data were obtained from the retrospective analysis of 4265 panoramic radiographs, which were observed by investigators who were previously calibrated using Cohen's Kappa coefficient. In agreement with the worldwide prevalence of this entity, the present study found four patients with this defect (0.1%), one of which was bilateral and the other three were in the right mandible. In addition, no predominance was found for a specific sex since the cases discovered belonged in the same way for males as for the females. Therefore, the present study provides information of the defect to professionals and students for future investigations