oral mycology

Oral Mycology
lectuer (19)
Dr.Baha,Hamdi.AL-Amiedie
Ph.D.Microbiology
Characteristic of fungi
1-• Eukaryotes ?
2- No chlorophyl (distinguishes them from ?
plants and algae) ?
3- Unicellular to filamentous ?
4- Rigid cell wall ?
5-Spore bearing stages in the life cycle ?
6-Usually reproduce by sexual and asexual ?
means ?
7-Insensitive to antibacterial antibiotics ?
In many cases vegetative cell of hypha ?
contains more
than one nucleus – typical hypha is a ?
nucleated tube
containing a cytoplasm ( a coenocytic) ?
and no septa
(cross walls) ?
• Septate hyphae have one or two nuclei ?
per cell

Morphological types of fungi ?
Three major groups ?
1. Moulds ?
2. Yeasts ?
3. Mushrooms ?
Dimorphic fungi – fungi that have ?
both a
yeast stage and a mould stage ?
In many cases vegetative cell of hypha ?
contains more
than one nucleus – typical hypha is a ?
nucleated tube
containing a cytoplasm ( a coenocytic) ?
and no septa
(cross walls) ?
• Septate hyphae have one or two nuclei ?
per cell

Asexual spores
Asexual reproduction ?
Asexual spore formation: ?
• chlamydospores (formed within ?
sporangia) ?
• conidia (formed naked at tips of ?
hyphae) ?
• budding (cell division) ?
• fragmentation (of mycelium) ?


Sexual spores
Sexual spores are ?
resistant to drying ?
heating, freezing, and ?
some chemical agents ?
• Not as resistant to heat ?
as are bacterial ?
endospores ?
• Either a sexual spore or ?
an asexual spore can ?
germinate and develop ?
into a new hypha and Mycelium ?
Fungal infection types
1-Rang from superfical infection to ?
ovewhelming systemic infections that
are rapidly fatal in the compromised
host
2-they are increased in frequency as ?
result of increased used of antibiotics
Corticostroids& cytotoxic drugs ?
3-classified into superfical, cutaneous ?
Subcutaneous&systemic ?
infection;Systemic infection are
subdivied into those caused by
opportunistic fungi & by those
caused by pathogenic fungi

Oral Aspect of fungal infections
Fungal infections in the oral and ?
perioral regions occur either as
primary localized lesions or as
manifestations of systemic mycoses.
By far the most common group of
fungal infections that dental
practitioners diagnose and treat are
caused by Candida spp. Some of the
rarer mycoses with oral
manifestations