Posterior interproximal caries Flashcards
How does interproximal caries occur
Plaque builds up under the contact area and they produce acid. They produce acid and generate a white spot lesion. Demineralization establishes a response to dentine – initial sclerosis. We then have demineralization of the enamel and the demineralization of dentine begins. The sclerosis starts to progress. The demineralization progresses and the initial phase of tertiary dentine begins.
what is sclerosis
calcification of the dentinal tubules
it is a defense reaction
how does sclerosis occur
occurs within the tubules when acid initially starts to penetrate them
The live odontoblast processes start to lay down calcification within the tubules and they become plugged with mineral deposits. This helps to slow down the acid advance, giving the pulp some protection from acid
what kind of cut does a diamond fissure bur leave
the grinding motion of the diamond fissure bur leaves a rough finish
why do carbide burs leave a smoother finish than diamond burs
they cut and chip away at the tooth structure rather than grinding as diamond burs do
what are the different shapes of burs
round
pear
cross cut
how does the configuration factor of an interproximal restoration compare with that of occlusal restorations
There is more unbound surfaces meaning a lower configuration factor and less polymerization stress.
what is proximal box preparation
used for approximal caries, we cannot prep from the straight mesial or from the straight distal, we can prep through the occlusal. Need to have 90 degree exit angles due to the rods. The end prep should look like a box
why is calcium hydroxide best used as a lining for infected dentine
alkalinity of it will kill bacteria still in tubules thus halting caries progress and stimulating formation of tertiary dentine by the pulp
what are the interproximal wedges for
the wedges must always be placed to ensure the gingival edge of the band is held against the teeth.
what is the modulus of elasticity
quantity that measures an object or substance’s resistance to being deformed elastically
what is bevel
cutting an angle through the enamel at the margins, to expose extra enamel prisms for bonding
what is the function of the matrix ring
helps stabilize the wedge and matrix and ensures tooth separation
where should flowable composite not be placed and why
to the occlusal cavo surface margin as it is not strong enough to take the occlusal load
what is occlusion checked using
articulating paper
miller forceps
