Evaluation of the effect of two types of laser on the growth of streptococcus mutans.
This study was done to compare the antibacterial effect of Photodynamic therapy (PDT) on streptococcus mutans (S. mutans) using two different light sources and photosensitizers (PS). Materials and methods: Five groups were studied in this research:no light and no toluidine blue ortho (TBO) as PS for control group, irradiation only (CO2 laser or Nd:YAG laser), and irradiation with PS (CO2 laser and TBO or Nd:YAG laser and TBO). Standard suspensions of S. mutans, based on the type of group, were used in different PDTs. Bacterial suspension from each treatment was subcultured onto the surface of Mueller-Hinton agar plates, and bacterial growth was assessed. The results were analyzed by analysis of variance (ANOVA). Results: There was a statistically significant reduction in the viability of S. mutans in TBO with CO2 laser and TBO with Nd:YAG laser groups (p value
Conclusion: It can be inferred that the mechanism of reducing biofilm formation by these two LAB strains is associated with sucrose-dependent cell-cell adhesion and the gtfC level of glucosyltransferases in the biofilm. Therefore, it is suggested that L. pentosus 13-4 and L. crispatus BCRC 14618 may contribute to preventing dental caries, as they showed an inhibitory effect on the growth and biofilm formation of the cariogenic bacterium S. mutans in vitro.
Conclusion: Healthcare providers' attention must be drawn to both untreated carious lesions and the high ECC proportion among preschool children.
We examined the dental caries scores obtained from caries induction, salivary secretion volume, and enamel hardness in the strains C57BL/6Slc, C3H/HeSlc, B6-Chr.2C3H, and three types of congenic mouse strains that we generated.ResultsWe successfully generated three types of congenic mouse strains. The caries scores of congenic mice, which had the C3H/HeSlc-derived interval between D2Mit126 (84 Mega base pair; Mbp) and D2Mit226 (163 Mbp), were significantly lower than that of any other mouse strain studied herein (p
Dental emergencies present frequently to the emergency department and urgent care centers. Trauma to the teeth includes fractures, luxations, and avulsions, which can be reduced in most cases. Avulsed primary teeth should never be replaced. Mouthguards should be worn in most youth sports to prevent many dental injuries. Dental caries can progress to worsening infection and should be diagnosed and promptly referred. More severe infections may require antibiotics, imaging, or incision and drainage. Dental blocks can assist with analgesia and patient comfort during other procedures.
This article focuses on the identification, etiology, management, and complications of common infectious processes (candidiasis, dental caries, and herpes labialis), inflammatory lesions (sialolithiasis, oral lichen planus, and aphthous ulcer), and benign entities (bony tori and mucocele).
ConclusionWe review the current literature on the main processes that generate S. mutans genomic diversity, as well as the phenotypic variability of its main virulence factors. S. mutans achieves its pathogenesis by sensing the intra- and extracellular environments and regulating gene transcription according to perceived environmental modifications. Consequently, this regulation gives rise to differential synthesis of proteins, allowing this species to potentially express virulence factors.
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Women from ancient societies have shown a higher prevalence of dental caries in comparison with men. Recent research has shown that the relationship between increased oestrogen production during pregnancy and decreased salivary flow is a possible cause for the higher levels of caries in women, which is in contrast to the traditional view of sexual division of labour resulting in unequal access to cariogenic food. In order to test these two hypotheses, individuals exhumed from 12 South American archaeological sites were examined for markers of oral health (caries, ante mortem tooth loss, deep caries, and enamel hypoplasia) ...
AbstractObjectivesThe Great East Japan Earthquake and subsequent tsunami cause large ‐scale destruction in the north‐eastern coastal areas in Japan, and forced many survivors to relocate to prefabricated temporary housing, a typical emergency accommodation. Based on the hypothesis that higher toothache prevalence among the disaster survivors is associated with postdisaster distr ess, we determined the impact of temporary residential environment as potential stressor on the subjective toothache prevalence.MethodsA repeated cross ‐sectional health survey based on self‐reported questionnaire was conducted in 2776 disa...
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