What are the normal flora of the oral cavity?
Normal Flora of the Oral Cavity The presence of nutrients, epithelial debris, and secretions makes the mouth a favorable habitat for a great variety of bacteria. Oral bacteria include streptococci, lactobacilli, staphylococci and corynebacteria, with a great number of anaerobes, especially bacteroides.
What are the microorganisms most commonly found in the healthy oral cavity?
Some bacteria like Streptococcus, Granulicatella, Gemella, and Veillonella are amongst the predominant microorganisms of the oral cavity; however, the majority of bacteria are explicit to certain sites.
Are there any microorganisms in an oral cavity?
The oral cavity has the second largest and diverse microbiota after the gut harboring over 700 species of bacteria. It nurtures numerous microorganisms which include bacteria, fungi, viruses and protozoa.
What is normal flora in microbiology?
Normal flora are the microorganisms that live on another living organism (human or animal) or inanimate object without causing disease. The human body is not sterile; we become colonised by bacteria from the moment we are born.
What is normal microbial flora of the human body?
A diverse microbial flora is associated with the skin and mucous membranes of every human being from shortly after birth until death. The human body, which contains about 1013 cells, routinely harbors about 1014 bacteria (Fig. 6-1). This bacterial population constitutes the normal microbial flora .
Which microorganisms can cause infections in the oral cavity?
Etiology. Periodontal infections are usually mixed, most often involving anaerobes such as Treponema denticola and Porphyromonas gingivalis. The microaerophile Actinobacillus actinomycetemcomitans causes a rare form known as localized juvenile periodontitis.
What is oral flora?
The oral flora is a complex body formed by at least a hundred bacterial species which can be more or less regular residents in the oral cavity.
What is dental flora?
The oral cavity is comprised of many surfaces, each coated with a plethora of bacteria, the proverbial bacterial biofilm. Some of these bacteria have been implicated in oral diseases such as caries and periodontitis, which are among the most common bacterial infections in humans.
What does normal flora consist of?
The normal flora of humans consists of a few eucaryotic fungi and protists, but bacteria are the most numerous and obvious microbial components of the normal flora. Figure 1. Gram stain of a species of Micrococcus, commonly isolated from the skin and nasal membranes of humans.
What is function of normal flora?
The functions of the normal flora include digestion of substrates, production of vitamins, stimulation of cell maturation, stimulation of the immune system, aid in intestinal transit and colonization resistance.
What is normal flora Slideshare?
Normal Flora Definition Normal flora is the mixture of microorganisms (bacteria and fungi) that are regularly found at any anatomical site of human body.
What microorganism causes decay?
Microorganisms such as bacteria and fungi cause decay. They are called decomposers. A microorganism needs oxygen, water and a suitable temperature to survive. Microorganisms break down sewage (human waste), dead plants and plant waste such as dead leaves into compost.