Streptococcus Mutans Research Articles

Antimicrobial Effects of Orthodontic Molar Tube Coated with ZnO Nanoparticles Using Electrophoretic Deposition Method: A Randomized Clinical Trial.

This study aimed to evaluate the antimicrobial effect of coated orthodontic molar tubes (COMT) with zinc oxide nanoparticles (ZnO NPs) using an electrophoretic deposition method (EPD) and to evaluate the orthodontic molar tubes (OMT) bond failure rate. Seventy-two orthodontic molar tubes (OMTs) for second molars were divided into two groups 36 each; one group coated with ZnO NPs and the other control negative uncoated. The OMT was coated using the EPD method with ZnO NPs in a concentration of 10g/l. The OMTs were randomly allocated using a split-mouth, cross-quadrant design. After 2weeks of appliance placement, swabs were taken from the surface of the OMTs for microbial assessment against Streptococcus mutans, Lactobacillus acidophilus, and total bacterial counts; additionally, plaque and gingival indices were assessed. The patient was followed for 3months to evaluate the bond failure rate. The COMT showed a statistically significant reduction in total bacterial accounts, S. mutans, and L. acidophilus compared to UOMT (P < 0.001). Furthermore, the plaque and gingival indices near COMT were significantly less than that of UOMT. The bond failure rate was not significant between the COMT and UOMT. The COMT with ZnO NPs has potent antibacterial activity against the tested pathogens with a reduction in the amount of plaque accumulation. The use of the EPD method was feasible without adverse effects on theorthodontic molar tubes bond failure rate.

Veillonella parvula acts as a pathobiont promoting the biofilm virulence and cariogenicity of Streptococcus mutans in adult severe caries.

Adult severe caries (ASC) brings severe oral dysfunction and treatment difficulties to patients, and yet no clear pathogenic mechanism for it has been found. This study is focused on the composition of dental plaque microbiome profiles in order to identify disease-relevant species and to investigate into their interactions with the S. mutans. Samples of dental plaque were collected for metagenomic analysis. The acidification, aciduricity, oxidative stress tolerance, and gtf (glucosyltransferase) gene expression of S. mutans cocultured with V. parvula which was identified as ASC-related dominant bacterium. The biofilm formation and extracellular exopolysaccharide (EPS) synthesis of dual-strain were analyzed with scanning electron microscopy (SEM), crystal violet (CV) staining, live/dead bacterial staining, and confocal laser scanning microscopy (CLSM). Furthermore, rodent model experiments were performed to validate the in vivo cariogenicity of the dual-species biofilm. The most significantly abundant taxon found associated with ASC was V. parvula. In vitro experiments found that V. parvula can effectively promote S. mutans mature biofilm formation with enhanced acid resistance, hydrogen peroxide detoxicity, and biofilm virulence. Rodent model experiments revealed that V. parvula was incapable of causing disease on its own, but it significantly heightened the biofilm virulence of S. mutans when being co-infected and augmented the progression, quantity, and severity of dental caries. Our findings demonstrated that V. parvula may act as a synergistic pathobiont to modulate the metabolic activity, spatial structure, and pathogenicity of biofilms of S. mutans in the context of ASC.IMPORTANCEAdult severe caries (ASC), as a special type of acute caries, is rarely reported and its worthiness of further study is still in dispute. Yet studies on the etiology of severe caries in adults have not found a clear pathogenic mechanism for it. Knowledge of the oral microbiota is important for the treatment of dental caries. We discovered that the interaction between V. parvula and S. mutans augments the severity of dental caries in vivo, suggesting V. parvula may act as a synergistic pathobiont exacerbating biofilm virulence of S. mutans in ASC. Our findings may improve the understanding of ASC pathogenesis and are likely to provide a basis for planning appropriate therapeutic strategies.

Antimicrobial Properties of Newer Calcium Silicate-Based Pulp-Capping Agents Against Enterococcus Faecalis and Streptococcus Mutans: An In-Vitro Evaluation.

This study aimed to evaluate the antibacterial activity of calcium silicate-based pulp-capping agents against Enterococcus faecalis and Streptococcus mutans using an agar diffusion test. The agar diffusion method was used to evaluate the antibacterial properties of pulp-capping agents. The materials used included Bio-C® Temp (Angelus, Brazil), Dia-Root™ Bio mineral trioxide aggregate (MTA) (Diadent Europe B.V., Almere, Netherlands), Biodentine™ (Septodont, Saint-Maur-des-Fossés, France), and TheraCal LC (Bisco Inc., Schaumburg, IL). Eighteen petri dishes, nine for S. mutans and nine for E. faecalis, were divided into four parts each (one for each agent), for a total sample size of 72. The bacterial suspensions were transferred to the petri dishes using a sterile swab. Four wells with a diameter of 4 mm were then punched in each petri dish. The wells were filled with the pulp-capping agents, which had been mixed according to the manufacturer's instructions, and the petri dishes were incubated. The zone of inhibition was measured at 24 and 48 hours to assess the pulp-capping agents' antimicrobial efficacy against E. faecalis and S. mutans. The readings were tabulated and subjected to statistical analysis. At 24 hours, the highest zone of inhibition was found in the Biodentine™ group (15.83 ± 0.79 mm), followed by Dia-Root™ Bio MTA (14.5 ± 0.88 mm), TheraCal LC® (12.56 ± 0.53 mm), and the shortest in the Bio-C Temp (9.61 ± 0.70 mm) against S. mutans. Analysis of variance (ANOVA) test showed a high statistical significance. After 48 hours, there was no statistically significant difference in the mean zone of inhibition. At 24 hours, the highest zone of inhibition was found in the Biodentine™ group (20.56 ± 0.73 mm), followed by Dia-Root™ Bio MTA (20.06 ± 1.33 mm), TheraCal LC® (18.22 ± 0.97 mm), and the shortest in the Bio-C Temp (14.11 ± 0.78 mm) against E. faecalis. The ANOVA test indicated no statistically significant difference between the Biodentine™ and the Dia-Root™ Bio MTA groups. After 48 hours, there was no statistically significant difference in the mean zone of inhibition. Biodentine™ has higher antibacterial efficacy against S. mutans, while Biodentine™ and Dia-Root™ Bio MTA have comparably high antibacterial activity against S. mutans and E. faecalis at 24 and 48 hours.

Comparing the Antibacterial Efficacy of Morus Alba (Mulberry Leaf) Extract and 0.2% Chlorhexidine: An Invitro Assay

Background: Morus Alba is being used for the treatment of diabetes to reduce blood sugar levels. It has also shown antimicrobial and anti-inflammatory activity against Candida albicans, Saccharomyces cerevisiae, Escherichia coli, Salmonella typhimurium, Staphylococcus epidermis, and S. aureus. Extracts of the bark of Morus alba have also shown bactericidal activity against the oral Streptococci. Aim: To compare the antibacterial efficacy of Morus Alba (mulberry leaf) extract with 0.2% chlorhexidine gluconate mouthwash. Material &amp; methods: The Morus Alba aqueous leaf extraction was carried out by using the hot maceration technique with deionised water, and the minimal inhibition concentration (MIC) of the of the Morus Alba aqueous leaf extract was evaluated against the biofilm-forming Streptococcus mutans. Results: The minimal inhibition concentration (MIC) of hot methanol extract of Morusalba (2.5 mg/ 10 ml) was used to study its effect on bacterial growth. As the concentration of Morus Alba aqueous leaf extract increases, the OD values decrease, indicating reduced bacterial growth. The reduction percentage increases with higher concentrations of leaf extract, showing a dose-dependent inhibition of Streptococcus mutans. The 0.2% CHX shows the highest reduction, confirming its effectiveness. Conclusion: The aqueous extract of Morus Alba mouthwash shows a significant inhibitory effect on Streptococcus mutans, with higher concentrations leading to a greater reduction in bacterial growth.

Some oral microbiota in complete cleft infants in comparison with normal infants.

To compare caries-related microorganisms and candida in complete cleft infants with normal palate infants. The case-control study was conducted from April 2021 to January 2022 at the College of Dentistry, University of Baghdad, Baghdad, Iraq, and comprised infants with age ranging from 1 day to 4 months. They were divided into complete cleft group A and control group B. Group A was subdivided into those with class III Veau's palatal classification, and the rest with class IV Veau's palatal classification. Samples were taken using oral swab which were subjected to colony morphology, gram staining and biochemical testing. Data was analysed using SPSS 21. Of the 52 subjects, 26(50%) were in each of the 2 groups. The subgroups of group A had 13(50%) patients each. The counting and colonisation of streptococcus mutans, lactobacilli and candida albicans were significantly higher in group A than in group B (p<0.05). The difference between the subgroups of group A was not significant (p>0.05). Infants with cleft palate were more susceptible to dental caries and oral infection than those with normal palate.

Risk factors associated with Helicobacter pylori infection among patients attending private clinics in Borama district, Somaliland

ABSTRACT Risk factors associated with Helicobacter pylori infection among patients attending private clinics in Borama district, Somaliland, are studied. We specifically investigated the association among the use of non-steroidal anti-inflammatory drugs, the users’ socioeconomic status, and the household hygiene practice of people with H. pylori infection attending the Borama private clinic. Helicobacter pylorus (H. pylori) is a Gram-negative spiral-shaped bacterium that infects gastric-type epithelium, and it is probably the most common bacterial agent in humans after Streptococcus mutans, which causes dental caries. H. pylori infection is now recognized as a worldwide problem and it is the most common cause of chronic gastritis and is strongly linked to peptic ulcer disease and gastric cancer. The prevalence of H. pylori infection is high in less-developed Asian countries like India, Bangladesh, Pakistan, and Thailand, and is acquired at an earlier age than in the more developed Asian countries like Japan and China. H. pylori infection is a global public health problem, affecting over 50% of the population worldwide.

Discovery of two new actinobacteria, Micromonospora palythoicola sp. nov. and Streptomyces poriticola sp. nov., isolated from marine invertebrates

Marine invertebrates represent an underexplored reservoir for actinobacteria, which are known to synthesize novel bioactive compounds. This study isolated 37 actinobacterial strains from five distinct marine invertebrate hosts, namely Chondrilla australiensis, Palythoa sp., Favia sp., Porites lutea, and Acropora cervicornis, while no strains were obtained from Lissoclinum sp. and Lithophyllon sp. These isolates were taxonomically classified into six genera: Gordonia, Microbacterium, Micromonospora, Nocardia, Rhodococcus, and Streptomyces, with Streptomyces and Micromonospora being notably predominant. Comparative genomic analysis facilitated the identification of two novel species: Micromonospora palythoicola sp. nov. (strain S2-005T = TBRC 18343T and NBRC 116545T) and Streptomyces poriticola sp. nov. (strain C6-003T, =TBRC 17807T and NBRC 116425T). Both species exhibited substantial genetic differences from their nearest known species as demonstrated by digital DNA-DNA hybridization and average nucleotide identity scores, which fell below the thresholds of 70% and 95%, respectively. Streptomyces poriticola C6-003T displayed significant antimicrobial activity and selective cytotoxicity against human breast cancer MCF-7 cells, with reduced toxicity towards human dermal papilla cells. Micromonospora palythoicola S2-005T manifested antimicrobial properties against Streptococcus mutans and Kocuria rhizophila. These findings highlight the considerable diversity of actinobacteria within marine invertebrates and underscore their potential as a source of new species with promising biological properties for therapeutic applications.

Evaluation of fatty acid composition and antimicrobial activity of supercritical fluid extract of Rubus ulmifolius Schott fruits

In this study, we continue our research on Rubus ulmifolius Schott extracts obtained by supercritical fluid extraction (SFE) using CO2 as solvent. Extraction experiments were carried out at pressures of 300 bar and a temperature of 40 °C, SFE [300:40], on mature fruits of R. ulmifolius. The fatty acid (FA) profile of extracts was assessed by reversed-phase HPLC-DAD/ELSD analysis. The most represented fatty acids in the extract were linoleic acid (386 mg/g), oleic acid (210 mg/g), linolenic acid (112 mg/g), palmitic acid (48 mg/g), and stearic acid (40 mg/g). SFE extraction showed a total FA amount of 795.8 mg/g of dry weight. The chemical and biological characteristics of this extract were compared with those obtained with different extraction methods. Following the diffusion-susceptibility test, three fruit extracts, SFE [300:40], Sx, and MEtOH, didn’t show an inhibition profile against Streptococcus mutans. Kirby-Bauer analysis showed only the methanolic extract demonstrated antimicrobial activity with 11-mm inhibition diameter.

Enhancing Removable Partial Dentures Hygiene: Investigating Mucolytic Agents and Biocides for Disrupting Biofilms and Improving Antimicrobial Efficacy.

This study evaluates the antibiofilm action of 2.5 mg/mL peracetic acid (PA), 0.5 mg/mL cetylpyridinium chloride (CPC), and 160 mg/mL N-Acetylcysteine (NAC) against multispecies biofilm of Streptococcus mutans, Staphylococcus aureus, Candida albicans, and Candida glabrata, developed on surfaces of heat-polymerizing acrylic resin (AR) and cobaltchromium (Co-Cr) alloy. A multispecies biofilm was grown on the surface of AR and Co-Cr specimens (Ø 12×3mm). After biofilm maturation, the specimens were immersed in experimental solutions and evaluated through biofilm viability (CFU) (n&#61;9), biofilm metabolic activity (XTT) (n&#61;9), biofilm-covered areas (Live/Dead) (n&#61;2), effects on the extracellular polymeric substance (EPS) (n&#61;2) and biofilm morphology (n&#61;1). Data were analyzed by ANOVA and the Tukey post-test or Kruskal-Wallis followed by the Dunn post-test (α&#61;.05). Overall, all evaluated solutions impacted biofilm viability. PA presented wider activity by reducing CFU of all microorganisms on both surfaces, XTT (P<.001) and Live/Dead (P<.001). NAC had a notorious effect in reducing the viability of bacteria without affecting the yeasts. NAC reduced XTT on AR (P&#61;.006) and Co-Cr (P&#61;.003) but did not reduce the aggregated biofilm layer. CPC had distinct effect according to the surface, being most effective in reducing CFU on AR than the Co-Cr surface. However, it did not influence XTT, and the amount of residual aggregated biofilm. PA provided the greatest antibiofilm action, while CPC and NAC showed intermediate action. Nonetheless, no solution was able to completely remove the biofilm adhered to the surfaces of heat-polymerizing AR and Co-Cr alloy.

Discovery of Active Antibacterial Fractions of Different Plant Part Extracts of clove (Syzigium aromaticum) Against Streptococcus mutans

Nowadays, dental cavities caused by Streptococcus mutans are a major focus of research in Indonesia. While several antibiotics are available to combat this bacterium, concerns about antibiotic resistance have prompted researchers to explore natural remedies. Clove (Syzigium aromaticum) is a commonly studied natural remedy against dental cavities and S. mutans. Among the different parts of the clove plant, clove bud is the most widely used against dental cavities or S. mutans, and the potential of other clove parts has not been thoroughly explored. Identifying which parts of the clove plant have higher concentrations of active ingredients and exhibit the strongest antibacterial activity is important. Therefore, this study evaluated the antibacterial activity of three different parts, i.e., leaf, stems, and buds of the clove plant ethanolic extracts against S. mutans. The ethanolic extracts of clove leaf, stems, and buds were prepared using the maceration method with 70% ethanol, and their activity against S. mutans was tested using the disc diffusion method at three different concentrations (10%, 5%, 2.5% b/v). Fractionation was carried out using hexane and water to obtain two fractions: hexane and water fraction. These fractions were then subjected to antibacterial assays. The ethanolic leaf, stems, and bud extracts exhibited varying antibacterial activity levels. The best activity was observed with the 10% clove bud ethanolic extract, which produced an inhibition zone of 20.83 ± 0.77 mm. The leaf and stem extracts showed inhibition zones of 16.38 ± 3.84 mm and 17.95 ± 5.15 mm, respectively. Furthermore, the hexane-soluble fraction of the clove bud displayed the highest activity with an inhibition zone diameter of 23.7 ± 3.21 mm at 10%. This activity was twice as high as ampicillin, used as the positive control. In conclusion, clove bud remains the best source of antibacterial compounds against S. mutans. Fractionation of the bud extract using hexane can significantly enhance its activity. Further investigation should be conducted to optimize the effectiveness of this active fraction for use as an anti-dental caries treatment.

Synthesis and Application of Silver Nanoparticles for Caries Management: A Review.

Silver nanoparticles have unique physical, chemical, and biological properties that make them attractive for medical applications. They have gained attention in dentistry for their potential use in caries management. This study reviews the different synthesis methods of silver nanoparticles and the application of them for caries management. Silver nanoparticles are tiny silver and are typically less than 100 nanometres in size. They have a high surface area-to-volume ratio, making them highly reactive and allowing them to interact with bacteria and other materials at the molecular level. Silver nanoparticles have low toxicity and biocompatibility. Researchers have employed various methods to synthesise silver nanoparticles, including chemical, physical, and biological methods. By controlling the process, silver nanoparticles have defined sizes, shapes, and surface properties for wide use. Silver nanoparticles exhibit strong antibacterial properties, capable of inhibiting a broad range of bacteria, including antibiotic-resistant strains. They inhibit the growth of cariogenic bacteria, such as Streptococcus mutans. They can disrupt bacterial cell membranes, interfere with enzyme activity, and inhibit bacterial replication. Silver nanoparticles can inhibit biofilm formation, reducing the risk of caries development. Additionally, nano silver fluoride prevents dental caries by promoting tooth remineralisation. They can interact with the tooth structure and enhance the deposition of hydroxyapatite, aiding in repairing early-stage carious lesions. Silver nanoparticles can also be incorporated into dental restorative materials such as composite resins and glass ionomer cements. The incorporation can enhance the material's antibacterial properties, reducing the risk of secondary caries and improving the longevity of the restoration.

Metabolit Sekunder dan Aktivitas Antibakteri Ekstrak Metanol Daun Kamboja Putih (Plumeria acuminata Ait) Terhadap Beberapa Bakteri Uji

Kamboja (Plumeria acuminata Ait) plant is traditional medicine used as medication for ulcer and abscess. Steroid and tanin is component of chemical compound in kamboja leaves that supposed to have antibacterial activity. This study aims to determine the content of secondary metabolites and effective concentration of methanol extracts of kamboja leaves as antibacterial. Identification contains of secondary metabolites by used reagent Mayer, Dragendorf, Liebermann-Burchard, FeCl, Mg powder and HCl. Analysis of secondary metabolites characterized by the presence of sediment or froth. The antibacterial activity test carried out by agar diffusion method. Inhibition zone is analyzed by Anava and Duncan test. Secondary metabolite the compound containing steroid and tanin. The effective concentration of 40% were significantly different with a value of p = 0.00 (p&lt;0.05) on the growth of Streptococcus mutans and Staphylococcus aureus bacteria and a concentration of 30% is very significantly different from the value of p = 0.00 (p&lt;0.05) on the growth of Escherichia coli bacteria in vitro.

Bacterial adhesion and surface roughness of particulate-filled and short fiber-reinforced composites.

The objective of the study was to assess the initial adhesion of Streptococcus mutans (S. mutans) and surface roughness of different particulate-filled (PFC) and short fiber-reinforced (SFRC) composites. Five PFC composites (CeramX Universal, Filtek Universal, Omnichroma, Tetric Prime and Venus Diamond) and four SFRC composites (everX Posterior, everX Flow Bulk, everX Flow Dentin and experimental packable SFRC) were tested in this study. A non-contact 3D profilometer was employed to assess the surface roughness (Ra) of the polished specimens (using 4000-grit abrasive paper). For the bacterial adhesion test, the specimens (n = 5/group) were immersed in a solution of S. mutans to facilitate initial adhesion. To determine the number of cells on the surfaces of the discs as colony-forming units (CFU), the vials holding the microbial samples were highly agitated using a vortex machine. Subsequently, the samples were diluted multiple times and anaerobically incubated for 48h at 37°C on Mitis Salivarius Agar plates (Difco) supplemented with bacitracin. Bacterial adherence assessment was performed using SEM. The data were analyzed using ANOVA. All tested PFC and SFRC composites showed similar adhesion of S. mutan. The lowest Ra values (0.26µm) (p < 0.05) were found in the flowable SFRCs (everX Flow Bulk & Dentin), while the highest values (p < 0.05) were observed in CeramX and everX Posterior (0.42µm). Experimental SFRC had comparable Ra value (0.38µm) than other commercial composites. The presence of short microfibers in the composite appeared to have no adverse effects on the initial adhesion of bacteria or the surface roughness.

Synergetic inhibitory effect of isopropyl methylphenol-based agents on biofilm formation by Streptococcus mutans.

Dental caries and periodontitis are the most common oral diseases in humans and the main causes of tooth loss. Streptococcus mutans is primarily responsible for dental caries and dental plaque, which are triggered by biofilm formation on the tooth surface. In this study, biofilm inhibition by 4-isopropyl-3-methylphenol (IPMP)-based agents, consisting of IPMP and polyoxyethylene-hydrogenated castor oil (POEHCO), was investigated in vitro. Notably, the use of POEHCO in addition to IPMP inhibited S. mutans biofilms more drastically than IPMP alone. Moreover, the effects of IPMP on the expression of biofilm-related genes (gtfB, gtfC, and gtfD) were examined using quantitative real-time PCR. IPMP at sub-minimum inhibitory concentrations significantly downregulated the expression of these genes. These results suggested that the inhibitory effects on biofilm formation were synergistically enhanced by the surfactant and antibiofilm activities of IPMP. Therefore, IPMP-based agents as dentifrices may be useful to prevent oral diseases originating from biofilms.

Comparative Evaluation of Antimicrobial Activity and Minimum Inhibitory Concentration of Commercially Available Pediatric Dentifrices: An In Vitro Study.

The aim of this study was to evaluate the antimicrobial efficacy and minimum inhibitory concentration (MIC) of commercially available pediatric dentifrices containing different compositions against Streptococcus mutans and Lactobacillus activity. Four different commercially available brands of pediatric dentifrices, designated as sample I-fluoride, sample II-herbal, sample III-xylitol with nanosilver particles, and sample IV-xylitol with fluoride, along with two control groups (a positive control-ciprofloxacin and a negative control-distilled water), were tested for their antibacterial activity by measuring the zone of inhibition, followed by MIC against two dental bacterial pathogens, S. mutans strain and Lactobacillus acidophilus (LB) strain, at five different twofold dilutions of 100, 50, 25%, 12.5, and 6.25% concentrations. All four dentifrices were found to have wide variations in their effectiveness against the two tested microorganisms at 100% (pure) and 50% concentrations, with sample I having the highest activity, followed by sample IV and sample II. At 25% concentration, only sample I and sample IV showed antibacterial activity, while at 12.5 and 6.25% concentrations, none of the tested toothpastes exhibited any antibacterial activity. Sample III failed to show antibacterial activity even in pure form against the two microorganisms. In our present study, the fluoride-containing pediatric dentifrice with a lower fluoride concentration (458 ppm) exhibited the highest zone of inhibition, followed by the xylitol with fluoride dentifrice and the herbal dentifrice. No zone of inhibition was observed in the nanosilver with xylitol dentifrice. Dureha R, Navit S, Khan SA, et al. Comparative Evaluation of Antimicrobial Activity and Minimum Inhibitory Concentration of Commercially Available Pediatric Dentifrices: An In Vitro Study. Int J Clin Pediatr Dent 2024;17(8):938-944.

Poly-Ether-Ether-Ketone versus dead-soft coaxial bonded retainers: a randomized clinical trial. Part 2: periodontal health and microbial biofilm assessment.

Retainers have the potential to detrimentally impact periodontal health and contribute to tooth decay. To investigate periodontal health and bacterial biofilm related to Poly-Ether-Ether-Ketone (PEEK) fixed retainers as compared to Dead-soft coaxial fixed retainer (DSC). A two-arm parallel groups single-centre randomized clinical trial. The trial included patients whose orthodontic treatment was completed and required retainers. Participants were randomly assigned into two retainer groups: PEEK retainers, prepared by computer-aided design and manufacturing into 0.8mm wire form, and DSC retainers. The objectives included assessing periodontal health through plaque accumulation index (PI), bleeding on probing (BOP), periodontal pocket depth (PPD), gingival index (GI), calculus index (CI), and alveolar bone height (ABH) assessment. Biofilm assessment involved bacteriological screening of aerobic, facultative anaerobic, mutans streptococci, and lactobacilli. The periodontal indices and microbiological screening as well as were assessed at the debonding stage (T0), 1-month (T1), 3-month (T3), and 6-month (T6) after the commencement of the trial, except for the ABH, which was recorded using periapical radiograph at T0 and T6. Single blinding of participants in addition to the bacteriological specialist. Initially, the trial enrolled 46 participants, aged between 12 and 28 years, and were randomly assigned to two groups, with 23 participants in each group. Subsequently, one participant withdrew from the trial, resulting in a total of 45 participants whose data were analysed. Assessment of the periodontal indices, excluding the CI (P = .480), revealed statistically but not clinically significant differences between groups after 6-month of retention (P = .016 of PI, P = .020 of BOP, P = .05 of PPD, and P = .01 of GI). There was slight plaque accumulation, normal PPD (approximately 1mm), healthy to mild gingivitis with a GI of less than 1 and BOP was around 10%. Concerning the ABH, there was a noticeable reduction in its score after 6 months, particularly in the PEEK group, although the difference was not statistically significant (P = .102). Furthermore, the bacteriological viable count did not show any significant difference between the groups during the recall visits. There have been no reported negative consequences. Blinding the assessor of periodontal indices was not feasible due to the nature of the intervention. The trial follow-up duration was limited. Both the PEEK and DSC retainers have comparable impacts on periodontal health and bacterial accumulation and composition during the retention period. NCT05557136.

Preparation of Phosphorylated Chitosan From the Cuttlebone of Sepia pharaonis and the Effect of Concentration on Oral Clinical Pathogens.

Chitosan, a biopolymer derived from chitin, has attracted scholarly interest because of its antibacterial, biocompatible, and biodegradable characteristics. We can phosphorylate the cuttlebone of Sepia pharaonis, a natural source of chitin, to enhance its antimicrobial properties. Phosphorylated chitosan is promising for treating oral infections, which are the causative agents of a variety of dental disorders. The goalof this study is to look into how to make phosphorylated chitosan from cuttlebone and what effect different concentrations have on killing oral clinical pathogens like Streptococcus mutans, Pseudomonas aeruginosa, Escherichia coli, and Candida tropicalis. We extracted chitin and chitosan from the cuttlebone of a specimen of S. pharaonis. We then synthesized phosphorylated chitosan by phosphorylating chitosan. We then assessed the antimicrobial activities of phosphorylated chitosan using the well diffusion method. We characterized and evaluated it using Fourier transform infrared spectroscopy (FTIR), Fourier emission scanning electron microscopy (FESEM), and X-ray diffraction (XRD). Phosphorylated chitosan, in 100% concentration, had the highest inhibition zone of 14 ± 0.82 mm against P. aeruginosa and E. coli (14 ± 0.75). However, the two different concentrations studied showed no activity against both Candida tropicalis and S. mutans. This work successfully used the cuttlebone of S. pharaonis to yield phosphorylated chitosan, subsequently demonstrating its antimicrobial potential against dental clinical pathogens. Different concentrations of phosphorylated chitosan strongly controlled its antimicrobial activity, with larger concentrations exhibiting stronger inhibitory effects. According to these findings, phosphorylated chitosan appears to be a promising material for dental care solutions that target clinical bacteria in the mouth.

Antibacterial activity of coriander seeds extract (Coriandrum sativum) against the growth of Streptococcus mutans

Background: Streptococcus mutans is the main cause of dental caries, previously known as part of the normal flora in the oral cavity which plays a role in the process of fermenting carbohydrates to produce acid, and causes tooth demineralization. Chemical-based medicinal products such as toothpaste and mouthwash. Continuous use of chemicals can cause side effects for users such as hypersensitivity, therefore an alternative treatment from natural ingredients such as coriander seeds which can inhibit bacterial growth is needed. Objective: This research aims to determine the lowest concentration of coriander seed extract in 0,75%, 1.5%, 3% inhibiting the growth of Streptococcus mutans. Methods: This study was conducted by soaking the test discs in coriander seed extract concentrations of 0.75%, 1.5% and 3%. each disc was inserted into the bacterial culture to be cultured, incubated and seen whether there was a clear zone or not. Result: Test results showed a clear zone at a concentration 1.5% with an average diameter of 1.5 mm, at concentration of 3% an average diameter of 3.7 mm and at concentration of 0.75% did not show clear zone. Conclusion: Based on the results of the study, the lowest concentration of coriander seed extract was obtained which was able to inhibit the growth of Streptococcus mutans bacteria, is at concentration of 1.5%, the diameter of the inhibition zone of coriander seed extract had weak antibacterial activity.

Enhancing Dental Alginate with Syzygium aromaticum, Zingiber officinale and Green Silver Nanoparticles: A Nature-Enhanced Approach for Superior Infection Control.

The study addresses the challenge of cross-infection in dentistry, focusing on improving disinfection protocols for dental hydrocolloid gel materials. This research aimed to incorporate chlorhexidine, natural plant extracts, and green-synthesized silver nanoparticles (AgNPs) into dental alginate to enhance safety and hygiene standards in dental practices. Conventional dental alginate served as the control, with experimental groups including alginate modified with 0.2% chlorhexidine (CHX-group) and alginate incorporating AgNPs synthesized from Syzygium aromaticum (SA) and Zingiber officinale (ZO) extracts (SA + AgNPs and ZO + AgNPs groups). Plant extracts were analyzed via GC/MS to confirm their composition. UV-visible spectroscopy, SEM, and EDX characterized the synthesized AgNPs. Antimicrobial efficacy against Candida albicans, Streptococcus mutans, and methicillin-resistant and methicillin-sensitive Staphylococcus aureus was evaluated using agar well diffusion assays. The dimensional accuracy of alginate impressions was assessed according to ISO 21563:2021 standards. Chemical analysis of SA and ZO extracts identified 60 and 43 active compounds, respectively, supporting their use in AgNP synthesis. UV-visible spectroscopy, SEM, and EDX confirmed the formation of spherical AgNPs using SA and ZO extracts. Modified groups showed inhibitory activity against Streptococcus mutans and methicillin-resistant (MRSA) and methicillin-sensitive Staphylococcus aureus (MSSA), in contrast to the unmodified control. Both AgNP-modified groups demonstrated efficacy comparable to the CHX-group against MRSA and MSSA, with SA + AgNP showing superior performance against C. albicans. The dimensional accuracy of all groups was within clinically acceptable ranges as reported in the literature (0.027-0.083 mm). CHX, silver nitrate, and green-synthesized AgNPs present promising options for developing self-disinfecting alginate impression materials. Utilizing plant extracts in AgNP synthesis offers a safe, efficient, and synergistic approach between metal ions and phytotherapeutic agents. This approach could potentially enhance disinfection efficacy without compromising material performance, improving dental safety and hygiene.

Inhibition of Oral Pathogenic Bacteria, Suppression of Bacterial Adhesion and Invasion on Human Squamous Carcinoma Cell Line (HSC-4 Cells), and Antioxidant Activity of Plant Extracts from Acanthaceae Family.

Medicinal plants have traditionally been used to treat various human diseases worldwide. In this study, we evaluated the leaf extracts of plants from the Acanthaceae family, specifically Clinacanthus nutans (Burm.f.) Lindau, Thunbergia laurifolia Lindl., and Acanthus ebracteatus Vahl., for their compounds and antioxidant activity. The ethanolic extracts of A. ebracteatus showed the highest total phenolic content at 22.55 mg GAE/g extract and the strongest antioxidant activities, with IC50 values of 0.24 mg/mL and 3.05 mg/mL, as determined by DPPH and ABTS assays. The antibacterial efficacy of these extracts was also tested against Streptococcus pyogenes, Streptococcus mutans, Staphylococcus aureus, and Klebsiella pneumoniae. The diameters of the inhibition zones ranged from 14.7 to 17.3 mm using the agar well diffusion method, with MIC and MBC values ranging from 7.81 to 250 mg/mL. Anti-biofilm formation, antibacterial adhesion, and antibacterial invasion assays further demonstrated that these medicinal plant extracts can inhibit bacterial biofilm formation and prevent the adhesion and invasion of oral pathogenic bacteria on the human tongue squamous cell carcinoma-derived cell line (HSC-4 cells). The ethanolic extracts of C. nutans and A. ebracteatus were able to inhibit the gtfD and gbp genes, which facilitate biofilm formation and bacterial adherence to surfaces. These findings provide new insights into the antibacterial and antioxidant properties of plant extracts from the Acanthaceae family. These activities could enhance the clinical and pharmaceutical applications of plant extracts as an alternative therapy for bacterial infections and a dietary supplement.