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Mapa Mental por , criado more than 1 year ago

dentistry Oral Biology (Tooth development) Mapa Mental sobre Structure of pulp-dentin complex, criado por 0 9 em 19-11-2015.

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Structure of pulp-dentin complexBackgroundinfoDentinaltubules70% dentine is inorganicHap | 20% is organic (90%collagen, 10% GS) | 10%water3 Types (1°,2°, 3°)3 main types ofdentine1° - Outlines the pulpchamber, forms the bulk ofthe tooth - two "layers" - thinmantle layer, bulkier cirpl.dentine2° - Secreted after root formation atslower rate. Uneven distribution - lotsnear roof + floor of MOLAR pulpchambers.3°Reactionary - pre-existing OD secrete3° dentineReparative - newly differentiatedOD-like cells secrete 3° dentineSecreted in response to noxious stimuli.Intensity of stimulus is proportional tostrength of 3° dentine laid down. Only ODDIRECTLY affected by noxious stimuli secrete3° dentine.Produced as theodontoblasts secretedentine and migratepulpally - leaving behindcytoplasmic extensionembedded in dentineS- shaped course in coronaldentine (crowding) | Straightcourse in pulpal dentine (less SA- less crowding)Tapered (thinnest at ADJ -largest at pulp)Older = sclerotic (type ofperitub. dentine) = dentinaltubules occluded - glassyappearancePeritubular -hypermineralisedsections of dentineimmediately surroundingtubulesINTERTUBULAR DENTINEForms the bulkof the dentineNetwork of type 1collagen embeddedin ground substance(GP = PG's,Phospho's)Globular/Interglobular dentineHypomineralised areas ofdentine - failures of"globules" of mineralisation tofuse into one mass = formsINTERGLOBULAR dentineNo peritubulardentine foundhereVit D def. / Fluorosiscausative factorsFeatures + categories ofdentineIncremental growth lines - showingphases of quiescent/secretory activity.5 days patterns = incremental lines ofVon Ebner (20 microns apart).Incremental lines can be visualised astetracycline treatment courses end upcolouring these lines as they developGranular layer ofTomesOnly seen in groundsectionsBlack "dots" at CDJSmall airspaces due toroot dentinaltubules slowrate ofsecretionEnamel > Dentine >Bone hardnessPulp > Dentine >Enamel opacity onradiographAge changes indentine-pulpSclerotic dentine(occludes dentinaltubules)Secondary dentineoccludes pulpchamberClique duas vezes aqui para editar o textoClique e arraste este botão para criar um novo tópico