Introduction: The lack of knowledge about denture hygiene can negatively affect their maintenance. On the other hand, good oral hygiene can reduce the chances of plaque accumulation. Objetive: To determine if there is a relationship between knowledge of hygiene and denture maintenance. Material and Methods: A questionnaire was applied to 67 patients who wore partial and/or total removable prostheses daily to evaluate their knowledge of denture hygiene. For the evaluation of denture maintenance, clinical inspection of the removable prosthesis was carried out using the Vigild criterion to observe the amount of plaque that was adhered to it. Data were statistically processed with Spearman's correlation test to determine the relationship between hygiene knowledge and denture maintenance. Results: The patients presented a medium (37.3%) and low (56.7%) denture hygiene knowledge; and fair (68.7%) and poor (11.9%) maintenance of their prosthesis. There is a statistically significant relationship between hygiene knowledge and denture maintenance (p<0.001). Conclusion: There is little knowledge of denture hygiene. This level of knowledge has a statistically significant relationship with the maintenance of the prostheses.

The present in vitro study compared the inhibitory action of five pediatric toothpastes against Streptococcus mutans ATCC 25175. Materials and Methods: Cross-sectional, comparative and experimental study. The microorganism Streptococcus mutans ATCC 25175 was inoculated onto solid culture medium of Müeller-Hinton supplemented with blood, then the plates were inoculated with five pediatric toothpastes: Oral B Stages, Colgate Smiles, Aquafresh My Little Teeth, Dentito and Denture Kids. Samples were incubated at 37°C for 48 hours. Subsequently the inhibition halos were measured; the experiment was repeated 20 times for each sample. Statistical analysis was performed with ANOVA complemented with Tukey's test. Results: Oral B Stages yielded a mean inhibitory halo of 23.2mm, Colgate Smiles an average of 21.7mm, Aquafresh My Little Teeth of 13.6mm, Dentito of 18.5mm, and Denture Kids a mean of 23.0mm. When performing the ANOVA test, it was found that there was a significant difference in the inhibitory action of pediatric toothpastes (p<0.005) and when using Tukey's multiple comparison test, Oral B and Denture Kids presented similar inhibitory action. Conclusion: All toothpastes presented inhibitory action against Streptococcus mutans ATCC 25175. A significant difference between their effectiveness was observed. Oral B Stages showed the greatest degree of inhibition.

Objective: To determine the levels of depression, anxiety, and stress in dentists working in the northern region of Peru in times of COVID-19. Material and Methods: 310 dentists working in the northern region of Peru in times of COVID-19 were evaluated by means of an observational and cross-sectional study. Subjects were asked to give their informed consent and answer a virtual questionnaire containing 21 items based on the DASS-21 Scale that assesses depression, anxiety, and stress. A descriptive analysis was carried out with frequencies; for the variables of gender and years of work experience the Chi square test (p<0.05) was used. Results: It was found that 291 (93.87%) of the dentists suffered from some type of psychological disorder: stress (35.74%), anxiety (35.05%), depression (29.21%). Mild stress was the most prevalent accounting for 49.04% (51); mild depression with 45.88% (39), and moderate anxiety with 40.20% (41). A higher prevalence was found in females and in those dentists who had less than 5 years of work experience. Conclusion: 93.87% of dentists working in the northern region of Peru in times of COVID-19 presented some type of psychological disorder, a higher frequency of mild stress was found, followed by mild depression, and moderate anxiety.