Objective The aim of this study was to evaluate the effects of a nanofilled resin-base coating on the physical and mechanical properties of four different types of resin composites. Materials and Methods Disc-shaped specimens of four resin composites (Aura bulk fil [SDI], IPS Impress Direct [Ivoclar], Filtek Z250, and Filtek P60 [3M/ESPE]) were prepared and divided in two groups: either uncoated or coated with G-coat plus (n = 10). The specimens were obtained and stored in distilled water (DW) at 37°C. For water sorption and solubility, the specimens were stored for 60 days in DW and measured according to ISO 4049 instructions. The specimens were subjected to color change (ΔE), microhardness, and flexural strength (FS) measurements after 24 hours and 60 days of immersion in DW. Statistical analysis ANOVA, post hoc Tukey’s, and independent t-tests were used to analyze data. Results Mean solubility values of coated groups were significantly lower than that of uncoated ones (p < 0.001). No significant differences were detected between neither water sorption nor FS of coated and uncoated groups (p = 0.502 and p = 0.510, respectively). For all materials except IPS Empress, the mean values for ΔE were not statistically different between coated and uncoated groups, and mean microhardness values of the uncoated groups were significantly greater than the coated groups (p < 0.001). Conclusion Coating resin composites improved water sorption and solubility but increased ΔE, decreased microhardness, and had no significant effect on FS in the long run.
The current pandemic SARS-CoV-2 (also known as 2019-nCoV and COVID-19) viral infection is growing globally and has created a disastrous situation all over the world. One of the biggest challenges is that no drugs are available to treat this life-threatening disease. As no drugs are available for definitive treatment of this disease and the mortality rate is very high, there is an utmost need to cure the infection using novel technologies. This study will point out some new antimicrobial technologies that have great potentials for eradicating and preventing emerging infections. They can be considered as treatments of choice for viral infections in the future.
Background: In recent years, the use of mouthwashes containing green tea (GT) extract has been reported to prevent tooth decay. In laboratory studies, GT has been shown to be effective in controlling dental plaque and erosion. The aim of this review study was to evaluate the effectiveness of GT extract in controlling tooth decay and erosion in randomized clinical trials. Methods: By searching related keywords in the Scopus, PubMed, and WOS (Web of Science) databases, as well as searching for related studies in the Google Scholar database randomized clinical trial ( RCT) studies published in English by the end of 2019 were extracted. Then, eligible studies were carefully reviewed and the required data were extracted. Results: A total of 12 eligible studies were included in the study. The inclusion criteria of the study were human RCT studies, English language, and GT intervention. The exclusion criteria of the study were lack of negative (placebo) or positive control group, studies examining the effect of GT derivatives, oral diseases such as periodontal disease, people undergoing orthodontic treatment, use of antibiotics at least two weeks before the study, incomplete methodology, defects in the results, and lack of access to the full text of articles. The number of subjects was 246 in the GT group, 157 in the placebo group, and 132 in the positive control group (sodium fluoride, chlorhexidine, neem extract, and probiotic). Eleven studies used GT mouthwash and one study used toothpaste containing GT extract. In studies with placebo, GT showed a significantly better effect on dental plaque, oral pH, modulation of dental erosion, and reduction of the number salivary S. mutans and lactobacilli colonies. Additionally, GT had a similar and comparable effect to positive control groups in modulating the above-mentioned indices. Conclusion: GT extract can show anti-cariogenic and anti-erosive effects. Larger randomized clinical trials are needed to support our findings.
Objectives: Several risk factors have been recognized in the progress of coronavirus disease 2019 (COVID-19) toward a severe stage. Poor oral health has been relevant to many systemic diseases due to higher inflammation. This study sought to aim the influence of oral health status on severe COVID-19. Methods: A systematic search of the medical literature was done using a combination of search terms of online databases including PubMed/Medline, Medline, SCOPUS, Ovid, Cochrane database, and Google Scholar from December 1st, 2019 to July 30th, 2021. Only articles written in the English language were selected. Results: A total of 352 studies were reviewed for relevance, specified by the title, abstract, and full copy leading to a yield of 25 articles satisfying inclusion criteria. COVID-19 patients with poor oral health status were at a higher risk of intensive care unit (ICU) hospitalization, need for mechanical ventilation, first and second-week deterioration, delayed recovery period, and mortality. Predisposing individuals to serious systemic diseases, conducting pathogens to the lower airways, developing bacterial co-infection, impairing the function of the innate immune system, increasing expression of angiotensin-converting enzyme-II (ACEII) receptors, and enhancing expression of inflammatory cytokines are oral-related risk factors for severe COVID-19 infection. Conclusions: This systematic literature review presents that poor oral health status is linked to severe COVID-19 complications. Monitoring and maintaining oral health, identifying risk groups, and developing appropriate recommendations are simple strategies to combat the current coronavirus crisis.
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