Dental caries in primary and permanent teeth in children's worldwide, 1995 to 2019: a systematic review and meta-analysis

Background: Early childhood caries (ECC) is a type of dental caries in the teeth of infants and children that is represented as one of the most prevalent dental problems in this period. Various studies have reported different types of prevalence of dental caries in primary and permanent teeth in children worldwide. However, there has been no comprehensive study to summarize the results of these studies in general, so this study aimed to determine the prevalence of dental caries in primary and permanent teeth in children in different continents of the world during a systematic review and meta-analysis. Methods: In this review study, articles were extracted by searching in the national and international databases of SID, MagIran, IranMedex, IranDoc, Cochrane, Embase, ScienceDirect, Scopus, PubMed, and Web of Science (ISI) between 1995 and December 2019. Random effects model was used for analysis and heterogeneity of studies was evaluated by using the I2 index. Data were analyzed by using the Comprehensive Meta-Analysis (Version 2) software. Findings: In this study, a total of 164 articles (81 articles on the prevalence of dental caries in primary teeth and 83 articles on the prevalence of dental caries in permanent teeth) were entered the meta-analysis. The prevalence of dental caries in primary teeth in children in the world with a sample size of 80,405 was 46.2% (95% CI: 41.6–50.8%), and the prevalence of dental caries in permanent teeth in children in the world with a sample size of 1,454,871 was 53.8% (95% CI: 50–57.5%). Regarding the heterogeneity on the basis of meta-regression analysis, there was a significant difference in the prevalence of dental caries in primary and permanent teeth in children in different continents of the world. With increasing the sample size and the year of study, dental caries in primary teeth increased and in permanent teeth decreased. Conclusion: The results of this study showed that the prevalence of primary and permanent dental caries in children in the world was found to be high. Therefore, appropriate strategies should be implemented to improve the aforementioned situation and to troubleshoot and monitor at all levels by providing feedback to hospitals

Antimicrobial Activity and Wound Healing Properties of Aloe Arborescens Extract: An in Vivo Study

Background & Objective: Burn is one of the prominent causes of death around the world, however drug discovery attempts for burn healing has not been entirely successful. Aloe arborescens (A. arborescens), is effective in the burning wounds healing and growth inhibition of bacterial pathogens. Our objective was to assess the wound healing and antibacterial effects of A. arborescens in vivo. Materials & Methods: Thirty healthy Wistar rat animals were enrolled. The treatment process continued for 21 days and sampling was conducted on days 14 and 21 and the tissue slides were sent to the pathology laboratory for testing. The bactericidal activity of A. arborescens extract was evaluated using the disc diffusion method. Results: A. arborescens demonstrated a significant effect on the healing of burn wounds. Furthermore, the antibacterial effects of the A. arborescens extract against Gram-negative (Escherichia coli, Pseudomonas aeruginosa) was significantly higher than that against Gram-positive (Staphylococcus aureus, Bacillus cereus) bacterial species. Conclusion: In conclusion, this study indicated that A. arborescens extract had an improving effect on the healing process of third degree burns without toxicity to the tissue