VM dentine Flashcards
when ground sections of dentine are prepared for microscopy some water and air is deliberately left in the tubules why?
need water/air in tubules so can see them
need some tubules filled with mounting medium so that the whole section doesn’t appear dark
what is this curve in the dentinal tubules called?
primary curvature
what is this curve in the dentinal tubules called?
secondary curvature
what is this called where the dentine tubules split at the ADJ?
terminal branches
what is this called where the dentine tubule splits within the dentine?
lateral branching
what does this image show?
tubules in cross-section
what feature do these images all show?
interglobular dentine
what is interglobular dentine?
hypomineralised section where calcospherites have failed to fuse
what is this dark area at the edge of dentine next to cementum?
granular layer of tomes
what is the most popular explanation for the granular layer of tomes?
spaces from looped or expanded tubules
what does this band represent?
contour lines of owen
coincidence of second curvature
what is this dark area?
dead tracts due to odontoblast overcrowding
what are these dark areas?
dead tracts due to insult -> caries
what is this feature of a horizontal section of dentine?
intertubular dentine
what is this feature of a horizontal section of dentine?
peri-tubular dentine
what does the red line represent in dentine carious lesion?
zone of destruction - loss of tubular structure
what does the blue line represent in dentine carious lesion?
Zone of bacterial penetration - shown in lines as collagen still maintains tubules
what is this area?
tertiary dentine
what is this?
dead tracts due to overgrowth of odontoblasts
what is this?
sclerosis
highly mineralised - precipitation of calcium and phosphate which block off tubules so appear transparent
what is this transparent part?
translucent dentine you get as part of aging
why is this dentine light?
sclerosis due to aging
