Facultad de Odontología Tesis Especializaciones

Permanent URI for this collectionhttps://dspace-test.ucuenca.edu.ec/handle/123456789/23339

Browse

Browsing Facultad de Odontología Tesis Especializaciones by Author "Astudillo Ortiz, Jaime Leonardo"

Filter results by typing the first few letters
Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Accuracy in the marginal adaptation and/or internal adaptation of full-coverage fixed prostheses made with digital impressions and conventional impressions: A systematic review
    (Universidad de Cuenca, 2023-03-21) Cajas Guamán, María Augusta; Cabrera Toro, María Marcela; Astudillo Ortiz, Jaime Leonardo
    Objective: To verify compliance with the requirements established by the scientific community and to demonstrate the validity and reliability of the systematic reviews on the accuracy (marginal adaptation and/or internal adaptation) of the full-coverage fixed prostheses made with digital impressions versus conventional impressions. Methods: Searches were performed in three electronic databases, PubMed, Scopus, and Web of Science, as well as in the gray literature. In the search strategy, medical subject heading (MeSH) words were used in PubMed, and free terms were used for the titles and abstracts of each article. Each keyword was separated by the Boolean operator OR to later be combined with the Boolean operator AND. Six systematic reviews were included for qualitative synthesis. To assess the methodological quality of the included systematic reviews, the AMSTAR 2 tool was used Results:The search yielded 131 studies, of which 78 remained after removing duplicates. The title and abstract of each chosen study were assessed, and 22 articles were included for full text reading. Finally,six studies were included, of which three studies were considered to have low confidence, while the other three were considered to have critically low confidence. In addition, the six SRs evaluated the adaptation or marginal fit, while only three studies measured internal adaptation. Conclusions: The use of digital impressions in single fixed prostheses maintains a marginal level within the limit of clinical acceptability, however, the methodological quality of systematic reviews is poor, according to the AMSTAR 2 tool.
  • Thumbnail Image
    Item
    Revisión sistemática de impresiones digitales Intraorales
    (2019) Carrillo Vaca, David Gerardo; Astudillo Ortiz, Jaime Leonardo
    Statement of the problem: Intraoral digital impressions may vary in precision and trueness (accuracy) between scanners, this issue needs to be studied. Objective: Analyze, and compare the characteristics of accuracy (precision and trueness) of intraoral digital impressions. Methods: A Medline/Pubmed and Cochcrane search was performed to identify relevant articles about precision and trueness in digital impressions. The search was limited to articles that describe the superimposition of STL files gained from a pattern for fixed partial prosthesis with an intraoral scanner. The articles were determined from the PICOS system recommended by the PRISMA guidelines. Results: Three studies accomplished the eligibility criteria. The scanners included, and their results respectively were: Bluecam: 12.7±2.6 um / 17.5±1.8 um, Omnicam: 12.5±3.7 um / 13.8±1.4 um. Carestream 3500: 0.014 mm / 13±1, Zfx Intrascan: 0.033 mm / 30±10-45, Bluecam: 0.029 mm / 22.5±25-30, Omnicam: 0.031 mm / 30±32.5-27.5, True definition: 0.011 mm / 10±2.5-7.5. E4D dentist: 97.6±109.2 um / 114.2±80.7 um, Fastscan: 26.0±24.4 um / 45.2±29.8 um, iTero: 25.8±22.5 um / 52.1±38.8 um, Trios: 13.0±12.1 / 49.7±36.6 um, Zfx Intrascan: 132.3±124.4 um / 89.4±64.2 um. The studies evaluated the precision and trueness from the superimposition of STL images they manage the results in microns, only one study managed the results in millimeters. Conclusions and implications: The superimposition demonstrated different values according to each scanner, scanners with better performance were: in precision Bluecam, Carestream 3500, Trios. While in trueness were: Omnicam, True Definition, Fastscan.
  • Thumbnail Image
    Item
    Revisión sistemática de la resistencia de prótesis fijas provisionales sobre implantes
    (2019-11-26) Trujillo Jaramillo, María Cristina; Astudillo Ortiz, Jaime Leonardo
    Objective: the main objective is to search for articles that analize the fracture resistence of materials frequently used for making temporary crowns over dental implants. Materials and methods: the pubmed and Cochrane data bases were used for the research, in order to find articles about the fracture resistence of diferent techniques, cad cam and conventional techniques, for making temporary crowns over dental implants. The PICOS system was used to determine the main features of articles during the research. The PICOS system is part of the PRISMA recomendations for systematic reviews and metanalysis. Results: three studies accomplised with the selection criteria previously determined, they used temporary materials such as PMMA, acrylic resins to analize the fracture resistence to compression and thermocycling. Two of the studies made temporary crowns, and the last one used a temporary material block. The results were: in the fist study to PMMA: 3034.3 (Tooth – P) and 1602.9 N (Tooth – T), in the group TiBase 1510.5 (TiBase – P) and 963.6 N (TiBase – T), in the group Chair 1609.4 (Chair – P) and 1253.0 N (Chair – T). In the second study Cerasmart G.C., in the group CHAIR 977. N, in the group LAB 1130.6 N and in the group TOOTH 1893. 0 N. The third study Yilmaz compared ten PMMA temporary material and acrylic resins, he found an average range to fracture the crown of 789 to 1380 nw. Conclussions: the results demonstrated that it doesn't depend on the technique, but it does the material used, for instance cadcam materials are more resistent in a long term compared to conventional materials and conventional techniques under mechanic fatigue and thermocycling.