Enamel
96%inorganic/mineralized, 1% organic, 3% water
What is the composition of dentin?
70% inorganic, 20% organic, 10% water
4 zones
odontoblastic layer, cell-free zone, cell-rich zone, pulpal core
Systemic Fluoride
fluoridated community water, prescription supplements (tablets, lozenges, or drops), and certain fortified foods or beverages
What are the 5 ways enamel can be lost?
•Attrition
•Abrasion
•Abfraction
•Erosion
•Caries
occurs more rapidly due to increased organic composition
dentinal caries/ loss of dentin
components
intercellular substance, tissue fluid, cells, lymphatics, vascular system, nerves, fibers
Enamel is in constant state of __/__.
remineralization/demineralization
the production of enamel matrix that occurs during the apposition stage of tooth development, which varies according to tooth and its development.
Amelogenesis
production of initial dentin matrix/predentin during apposition stage of tooth development.
dentinogenesis
cells involved
1. fibroblasts
2. odontoblasts
3. dental pupl stem cells
4. WBC
Dentin types
•Peritubular – wall of tubule
•Intertubular between tubules
•Mantle outermost near DEJ under enamel
•Circumpulpal outer pulpal wall
•Primary before completion of apical formen
•Secondary after apical foramen
•Tertiary result of injury
•sclerotic
optical phenomenon produced by curvature of the enamel rods. These curves reduce the chances of the tooth splitting or fracturing.
Hunter Schreger Bands
number of adjoining parallel imbrication lines; demonstrate disturbance in body metabolism that affects odontoblasts by altering their production efforts
Contour lines of Owen
functions
protective, nutritive, sensory
divisions of pulp
coronal pulp and radicular pulp
ameloblasts are derived from
inner enamel epithelium of the enamel organ making enamel
an ECTOdermal product/of ectodermal origin
derived from
dental papilla of tooth germ
produced from
central cells of dental papilla during odontogenesis
all sensations received by pulp are perceived as
pain