Caries and oral biology Flashcards
what does brushing do to plaque
it does not remove it, but rather it disrupts it so that it is no longer cariogenic
why is there mineral loss in subsurface enamel but not in the surface enamel when there is a white spot lesion
the organic acid present on the plaque will penetrate the lesion and remove the mineral content. this surface will be receiving the ions from saliva so there is remineralisation on the surface, but there is not enough time for the sub surface enamel to be remineralised as well.
why should white spot lesions not be probed
the enamel is not supported and will break down as soon as you probe it. this is why white spot lesions cannot be probed
how does acid etching affect the enamel rods
the acid etches the surrounding portion of the rod in the inter rod region. the side of enamel rods is more prone to acid, and when there is etching the rods themselves are left in tact. it is the interred crystallites that lose the mineral content in the etching.
describe the SEM image of white spot lesions
porous structure of the rods, interrods are lost
how can you tell if a white spot lesion has been arrested
they will be further from the gingival margin where plaque would be found, meaning the lesions are arrested.
when preparing a cavity, how will you know if the odontoblasts have been lost
there will be bleeding. the blood vessels lie below the odontoblast layers so if there is blood then that has been breached.
which restorative material is used on the root and cervical region lesions
glass ionomer
which elements impacting chance of infection can lead to change in caries risk
social class
income
knowledge
attitudes
behaviour
education
