CIIS - Contribuições em Revistas Científicas / Contribution to Journals
Permanent URI for this collection
Browse
Browsing CIIS - Contribuições em Revistas Científicas / Contribution to Journals by Subject "3D printing"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Antimicrobial activity of a 3D-printed polymethylmethacrylate dental resin enhanced with graphenePublication . 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 were printed in a liquid crystal display printer. Disc specimens were used in antimicrobial evaluation, and bar-shaped specimens were used to measure surface roughness. The study of antimicrobial activity included the inhibition of the growth of C. albicans and S. mutans and their adhesion to the resin’s surface. Surface roughness increased with the increase in the graphene concentration. The growth inhibition of C. albicans was observed in the different concentrations of graphene after 24 h, with no recovery after 48 h. The specimens doped with graphene were capable of inactivating S. mutans after 48 h. The surface-adhesion studies showed that the density of microbial biofilms decreases in the case of specimens doped with graphene. Graphene, despite increasing the resin’s surface roughness, was effective in inhibiting the growth and the adhesion to the resin’s surface of the main inducers of prosthetic stomatitis.
- Mechanical properties of polymethyl methacrylate as denture base material: heat-polymerized vs. 3D-printed — systematic review and meta-analysis of in vitro studiesPublication . 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 with the PubMed/MEDLINE, Web of Science—MEDLINE and EMBASE databases, until 30 April 2022. Two researchers selected the studies independently, and thus eight articles were found eligible for analysis. A meta-analysis was developed to estimate flexural strength. The Cohen’s kappa corresponding to this review was 1.00, and the risk assessment was considered low for the included studies. The 3D printing resin presented lower values of flexural strength and hardness compared with the heat-cured resin. Regarding impact strength, a lower value was recorded for the heat-cured resin compared with the 3D printing resin. Three-dimensional printing resins are viable materials for making prosthetic bases but need further clinical research.