11 documents found, page 1 of 2
A different approach to analyzing the surface roughness of prosthetic dental ac...
Quezada, Margarida Martins; Fernandes, Carlos; Montero, Javier; Correia, André; Salgado, Helena; Fonseca, Patrícia(1) Introduction: Apart from the polishing method, conventional or mechanized, the arithmetic mean roughness (Ra) is the most common metric to evaluate the surface roughness of denture base acrylic resins. An overview of the constraints related to this roughness parameter is highlighted in this study. This research introduces new parameters for accessing a functional analysis of surface roughness. (2) Materials...
The antimicrobial effect of the incorporation of inorganic substances into heat...
Lima, Mariana; Salgado, Helena; Correia, André; Fonseca, PatríciaIntroduction: Polymethylmethacrylate (PMMA) is the most widely used denture base material due to its favourable properties. Several studies have tested the incorporation of anti-infective agents into PMMA as a strategy to prevent biofilm growth on the denture surface. This systematic review aims to evaluate the efficacy of incorporating inorganic antimicrobial particles into denture base resins in preventing an...
Mechanical and surface properties of a 3D-printed dental resin reinforced with ...
Salgado, Helena; Fialho, Joana; Marques, Marco; Vaz, Mário; Figueiral, Maria Helena; Mesquita, PedroObjectives: Commercial photocurable polymers used in dental additive manufacturing still have mechanical limitations. The incorporation of graphene may provide interesting advantages in this field. This study aimed to evaluate in vitro the effect of adding graphene nanoparticles to a 3D-printed polymethylmethacrylate dental resin in terms of surface roughness, flexural properties, and hardness. Methods: A 3D-pr...
The use of graphene for dental polymethylmethacrylate reinforcement - a systema...
Salgado, Helena; Fonseca, Patrícia; Vaz, Mário; Figueiral, Maria Helena; Mesquita, PedroObjectives: To produce a systematic review regarding the effect of graphene-reinforced polymethylmethacrylate used in dentistry on mechanical properties. Methods: Electronic databases (Pubmed/MEDLINE, Web of Science, Embase) were independently searched by two researchers for relevant studies published up to December 2021. An additional manual search was performed to identify relevant publications. The populatio...
Mechanical properties of polymethyl methacrylate as denture base material: heat...
Lourinho, Cláudia; Salgado, Helena; Correia, André; Fonseca, PatríciaThe synergy between dentistry and informatics has allowed the emergence of new technologies, specifically 3D printing, which has led to the development of new materials. The aim of this research was to compare the mechanical properties of dental base resins for 3D printing with conventional ones. This systematic review was developed using the PRISMA guidelines, and the electronic literature search was performed...
Antimicrobial activity of a 3D-printed polymethylmethacrylate dental resin enha...
Salgado, Helena; Gomes, Ana T. P. C.; Duarte, Ana S.; Ferreira, José M. F.; Fernandes, Carlos; Figueiral, Maria Helena; Mesquita, PedroThe present study aimed to test, in vitro, the antimicrobial activity against Candida albicans and Streptococcus mutans and the surface roughness of a 3D-printed polymethylmethacrylate dental resin enhanced with graphene. A 3D-printed polymethylmethacrylate dental resin was reinforced with four different concentrations of graphene: 0.01, 0.1, 0.25 and 0.5 wt%. Neat resin was used as a control. The specimens wer...
Investigation of the effect of the same polishing protocol on the surface rough...
Quezada, Margarida Martins; Salgado, Helena; Correia, André; Fernandes, Carlos; Fonseca, PatríciaThis investigation aims to determine the effect of the same polishing protocol on the surface roughness (Ra) of different resins obtained by different processing techniques. Acrylic resins obtained by CAD/CAM technology overcame the disadvantages identified in conventional materials. A total of thirty samples (six of each resin): self-cured, heat-polymerized, injection molded, CAD/CAM 3D-printed and CAD/CAM mil...
Técnica de polimento mecanizado na rugosidade de superfície de resinas acrílicas
Quezada, Margarida; Salgado, Helena; Correia, André; Fonseca, PatríciaObjetivos: A presente investigação tem como objetivo avaliar a viabilidade de utilização de uma técnica de polimento mecanizado na rugosidade de superfície de resinas acrílicas para bases protéticas. Materiais e métodos: Um total de trinta provetes foram confecionados (seis de cada tipo de resina): autopolimerizável (Probase® Cold, Ivoclar Vivadent, Liechtenstein), termopolimerizável (Probase® Hot, Ivoclar Viva...
Propriedades mecânicas do polimetilmetacrilato de impressão 3D - revisãos siste...
Lourinho, Cláudia; Salgado, Helena; Correia, André; Fonseca, PatríciaObjetivos: Comparar as propriedades mecânicas das resinas de polimetilmetacrilato para impressão 3D com as da resina convencional, na confeção de bases protéticas, de modo a apresentar evidência científica de valor e elucidar os profissionais de saúde para que estes saibam adequar a utilização dos materiais disponíveis à situação clínica mais indicada. Materiais e métodos: Esta revisão sistemática teve por base...
Thoracoscopic Lobectomy for Congenital Pulmonary Airway Malformation with Prena...
Barroso, Catarina; Felizes, Andreia; Silva, Ana Raquel; Braga, Inês; Gonçalves, Marta; Salgado, Helena; Gonçalves, Augusta; Cadilhe, AlexandraINTRODUCTION: Congenital pulmonary airway malformations (CPAM) are increasingly diagnosed in the prenatal period raising concerns on the post-natal management of asymptomatic cases. Favoring early resection are the concepts of better compensatory lung growth, and prevention of long-term risk of infection and malignancy. Our aim was to review the results of our conduct over the years, in which we promote early t...