Saliva Flashcards
Salivary glands Acid base equilibria in Oral Environment Saliva Composition and Function
A substance that conducts electricity when dissolved in water is called an
electrolyte
howto know if you have strong acid
all h’s disassociate
healthy resting saliva ph range
6.7-7.4
) buffer system
bicarboante
The concentration of bicarbonate ion in resting saliva is approximately
?mmol/L, and this increases to over ?mmol/L on stimulation
1
50
lower pka means what
stronger acid
neutral solution ph
7
erosion of tooth stucture
loss of dental
hard tissue due to chemical demineralisation
Acids demineralise the outer surface of enamel or dentine
factors influencing erosion(3)
Acid source – extrinsic/intrinsic including GORD
• diet
• Saliva variations like quantity and quality
danger zone for saliva ph
5.5
salivary pellicle
protein-based layer
which is rapidly formed on dental surfaces after its
removal by tooth brushing
acts as diffusion barrier
buffer solution
a solution that has
amounts of either a weak acid and its conjugate base, or a
weak base and its conjugate acid.
can resist change in ph
buffer capacity
the amount of acid or base
that a buffer can absorb without a significant
change in it’s pH
saliva
is a film of fluid that that keeps the oral cavity moist and coats the teeth and mucosa
3 major salivary glands
partoid
submandibular
sublingual
another name for whole saliva
mixed saliva
mixed/whole saliva is made up of
serous saliva and mucous saliva
serous saliva
watery consistency and high number of consituents dissolved in it
mucous saliva
thick/sticky secretion
provides lubrication for the mouth
consistency depends on time of day
resting saliva rates for each gland
submandibular 60%
sublingual 5%
partoid 20%
minor glands 15%
saliva basic characteristics
protein rich
hypotonic
vresting ph=6.7-7.4
important functions of saliva (2)
buffering acids
and
pellicle formation that promotes biofilm
biofilm
semipermeable membrane between the saliva and the tooth surface
galvanic shock
Pain or discomfort sensation caused
by electric current generated by a
contact between two dissimilar metals
mostly conducted by saliva
paratoid salivary glands location
superficial portion anterior and inferior to the ear between the skin and the maeester muscle
deeper portion behind the ramus of the mandible
submandibular glands locations
in the posterior part of the floor of the mouth adjacent to the medial aspect of the mandible and wrapping around the posterior border of the mylohyoid muscle.
classes of salivary ducts
intercalated
striated
excretory
serous acinus in duct system has x layer of epitelium
single
mucous acinus in duct system has x layer of epitelium
double
2 main secretory cells
serous and mucous
myoepethelial cell
location and fucntion
surrounding acinar cells
contracts and squeezes acinus to secret saliva
