Polymethyl methacrylate (PMMA) is widely used in modern dentistry, particularly in prosthodontics, orthodontics, and maxillofacial surgery. To improve the properties of PMMA, silver nanoparticles (AgNPs) are incorporated to enhance the antibacterial, antiviral, and antifungal effects of this material. This study aims to evaluate the antimicrobial properties of AgNPs as an additive to PMMA. Medical databases covered by the ACM, BASE, PubMed, and Scopus engines were searched. Of the 670 identified records, 23 studies were included that assessed the antibacterial and antifungal properties gained by incorporating AgNPs into PMMA. All of the studies included also contained a control group—PMMA without additives. Studies that evaluated nanoparticles other than AgNPs or materials other than PMMA were excluded. The data collected from the articles included the size and concentration of the nanoparticles, the method of sample preparation, sample size, information on the effect of nanoparticles on antimicrobial properties, and the contact time between the sample and the test tube containing fungi or bacteria. The data were presented in tables and graphs. The analysis indicated that increasing the weight percent concentration of AgNPs or extending the incubation time increases the antifungal efficacy. The result of Tau Kendall correlation showed that the pairs of data, concentration/incubation time and outcomes, are inversely proportional for fungi (p < 0.01). The results of the study are not entirely conclusive. Some limitations suggest the need for more standardized studies, which ideally should be conducted on human research groups and followed by a study of these properties and their effects on the human body. This systematic review followed PRISMA 2020 guidelines. The protocol was submitted to the Open Science Framework Registries (1 December 2024).

Background: The association between oral cavities and the SARS-CoV-2 virus is an issue commonly analyzed and studied. In our study, the relationship between the dental status and social environment of patients receiving treatment during the coronavirus pandemic and COVID-19 vaccination was analyzed. Methods: This retrospective study was based on 2034 dental records obtained from the Institute of Dentistry of the Medical University of Lodz. The collected data pertaining to caries enabled the assessment of the oral cavity health of individual patients and could be compared with the undergoing vaccination against COVID-19. Results: The statistically significant results showed that unvaccinated patients compared to vaccinated patients had more teeth with caries, less teeth extracted due to caries, more teeth in total, and lower DMFT and dental treatment indexes. It was shown that, with increased age, the value of the DMFT index increases. Statistically significant differences between patients living in rural and urban areas were as follows: rural residents showed lower DMFT and filling indexes. Conclusions: No direct relationship between the vaccination of patients and oral health has been proven. Statistically, the group of vaccinated patients are significantly older than the unvaccinated, and the significant differences between the above groups are most likely due to the difference in the average age of patients in the two groups. Our study showed a lower average DMFT index and a higher treatment intensity index in people from the countryside compared to those living in a large city. In this respect, our study stands in opposition to the existing research findings.

Background/Objectives: The loss of orthodontic microimplants is a common clinical complication that significantly disrupts the continuity of malocclusion treatment. Despite increasing clinical use of microimplant reinsertion, the factors influencing its success remain unclear. The aim of this exploratory systematic review was to examine the available literature regarding clinical outcomes related to the retention of orthodontic microimplants following their reinsertion. Methods: Studies that assessed the success of orthodontic microimplant reinserted were included in the review. Searches were conducted on 27 September 2025, in the following databases: BASE (Bielefeld Academic Search Engine), PubMed, Scopus, and EMBASE. The ROBINS-I (Risk of Bias in Non-randomized Studies—of Interventions) tool was used to assess the risk of bias. Due to heterogeneity of included studies, a narrative synthesis was performed. Results: Four of the 577 studies were included in the review. A total of 305 microimplants were reinserted in 276 patients. The overall success rate ranged from 44.16% to 66%. Analysis indicated a significantly higher success rate in the maxilla (up to 68.60%) compared to the mandible (lowest 36.84%). Furthermore, a narrative synthesis suggests better clinical outcomes for 8 mm long microimplants compared to 6 mm ones, as well as reduced reinsertion success in areas with high cancellous bone density. Regarding the modification of the insertion site, the current data are contradictory; while some studies indicate significant benefits from changing the site (e.g., to the midpalatal suture), others show no statistical difference compared to reinsertion at the same site. Overall, the evidence remains limited and heterogeneous. Conclusions: The current review of the literature on the success of reinsertion of orthodontic microimplants is subject to a high risk of misinterpretation, due to the limited amount of data and the risk of unidentified confounding factors. Further standardized clinical trials are needed to develop unified protocols for these procedures. Other: The review was prospectively registered with the Open Science Framework (OSF); osf.io/tbj2s.