Resinas flexíveis em prótese removível

: revisão sistemática

Abstract

Introduction: The conventional denture is the most popular rehabilitation treatment for edentulous patients. However, due to the presence of retentive elements and metallic structures in the aesthetic areas, several patients have reported both aesthetic and psychological problems. In addition, this type of dentures has low ductility and, therefore, low resistance to fracture. These limitations favoured the development of flexible resins for use in conventional oral rehabilitation, which provide greater comfort and aesthetics for the
patient. Effectively, the aim of this investigation is to evaluate if the fabrication of denture bases with thermoplastic flexible resins provide superior mechanical and physical results in comparison with conventional acrylic resin (polymethylmethacrylate). Methodology: After registering the research protocol in PROSPERO, the same was conducted using the PubMed/Medline®, Cochrane® Library, Web of Science® and Scopus® databases, where a combination of MeSH and free text terms were combined with boolean operators AND and OR. The selection of articles was carried out by two independent investigators, according to the PRISMA flowchart, and the agreement was evaluated by Cohen's kappa coefficient, being later analyzed and evaluated according to the established
inclusion and exclusion criteria. Results: In the total of the studies analyzed in this review, 431 specimens were evaluated, being 310 of flexible thermoplastic resin and 121 of conventional acrylic resin. The studies included are in vitro and compare the mechanical properties and physical characteristics between the different types of resin. The production of removable prosthetic bases in flexible
thermoplastic resin presents excellent mechanical results, but which, combined with poor physical characteristics, may not present superior results in the long term, compared to conventional acrylic resin. Conclusion: Given the results obtained, the option for these materials may not yet be an alternative to polymethylmethacrylate, but the literature lacks clinical studies.

Date of Award	30 Jul 2021
Original language	Portuguese
Awarding Institution	Universidade Católica Portuguesa
Supervisor	Patrícia Fonseca (Supervisor) & Helena Salgado (Co-Supervisor)