This study aimed to describe the factors associated with biofilms formation in dental pathology by comparison of bacterial growth on dental and stainlesssteel surfaces. We studied in vitro the behavior of Staphylococcus aureus Métis in order to observe the capacity of adhesion, to evaluate quantitatively the potential of proliferation and to compare the behavior of this germ in contact with the two surfaces. The biomaterials used were cylinders in Stainless steel (AISI 316L), dental fragments and stainless-steel fragments, all were disinfected for 15 minutes and then sterilized in a wet autoclave at 120˚C for 30 min. Macroscopic observation with a binocular magnifier of bacterial proliferation was carried out regularly after 6 h and 24 h of incubation. Observation by optical microscope based on GRAM staining made it possible to visualize the presence or absence of bacteria and to differentiate them. The adhesion of Staphylococcus aureus Méti S on dental fragments was compared to the one obtained on stainless steel fragments. We also carried a Bacterial count by optical dosing. The results show that the ability of this germ to colonize and develop biofilms on surfaces depends mainly on the characteristics of the surface. Rough surfaces as dental surface are more likely to developing biofilms than smooth surfaces like stainless-steel surface.
Objective
To characterise the role of VEGF, EG‐VEGF and its receptors in the development and progression of HNC.
Design
Human serum and tissues samples were collected from healthy, epulis and HNC patients and used for ELISA assays and immunohistochemistry studies, respectively.
Setting
Ibn Rochd Hospital of Casablanca (Morocco), INSERM and University of Grenoble Alpes (France).
Participants
We used serum from 64 patients with head and neck cancers and from 71 controls without general pathology. Tissues samples were collected from seven patients with OSCC and from seven patients with Epulis.
Main outcome measures
We compared circulating VEGF and EG‐VEGF in normal and HNC patients and determined the expression, localisation and quantification of VEGF, EG‐VEGF and its receptors; PROKR1 and PROKR2 as well as Ki67, CD31 and CD34 in OSCC and Epulis patients.
Results
Both EG‐VEGF and VEGF circulating levels were significantly decreased in the HNC (P < .01). OSCC patients expressed less EG‐VEGF and VEGF proteins, higher PROKR1 and PROKR2 with no change in CD31 and CD34 levels. A significant increase in Ki67 was observed in OSCC.
Conclusions
We demonstrated that circulating VEGF and EG‐VEGF are downregulated in HNC patients and in OSCC tissue. EG‐VEGF receptors were increased in OSCC, along with a stabilisation of two key markers of angiogenesis. These findings strongly suggest that downregulation of angiogenesis in HNC might explain its moderate metastatic feature.
Cystic fibrosis (CF) is the most common severe autosomal recessive disease in the Caucasian population. Although it remains incurable, it is currently possible to extend the life expectancy of patients with modern therapeutic possibilities. Given the medical issues that a child with CF faces, oral health may be perceived as being of lesser importance. Thus, the establishment of good dietary and oral hygiene practices may not take place, leading to an increased risk of caries and gingivitis due to poor oral hygiene. A change in patient management may be necessary to ensure optimal care.
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