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Oral Histology, Embryology & Genetics Dent 5315/DH2215 February 19, 2008. Embryology in The News. Dentinogenesis - The Formation of Dentin. Dentinogenesis Root Formation Dentin-Pulp Complex Dentin Classification Clinical Correlations. THE DENTIN-PULP COMPLEX. “Origins”. - PowerPoint PPT Presentation
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Oral Histology, Embryology & GeneticsDent 5315/DH2215 February 19, 2008
Embryology in The News
Dentinogenesis - The Formation of Dentin
A. Dentinogenesis
B. Root Formation
C. Dentin-Pulp Complex
D. Dentin Classification
E. Clinical Correlations
“Origins”
THE DENTIN-PULP COMPLEX
THE DENTIN-PULP COMPLEX
Dentin and pulp are related: a. embryologically b. histologically c. functionally
dental papilla/pulp
THE DENTIN-PULP COMPLEX
THE DENTIN-PULP COMPLEX
Mature dentin-pulp complex
Note vascularity of pulp
“Subodontoblastic plexus of Raschkow” occupies cell-free zone of Weil (crown only)
THE DENTIN-PULP COMPLEX
Note: a. dentin tubules &
odontoblastic processes
b. irregular mineralization fronts (arrows)
DENTIN CLASSIFICATION
Types of dentin: globular/interglobular
DENTIN CLASSIFICATION
Types of dentin:
Interglobular dentin is especially noticeable in vitamin D deficiency, high levels of fluoride, etc..
DENTIN CLASSIFICATION
Junction of primary & secondary dentin.
DENTIN CLASSIFICATION
Types of dentin:
DENTIN CLASSIFICATION
Types of dentin: reparative/tertiary dentin
What can initiate this type of dentin?
Exposed open tubules, caries, restorations, chemicals such as etching, etc.
ENAMEL vs DENTIN
Types of dentin: reparative/tertiary dentin
Note “S-shaped” tubules in coronal region
&
“dead tracts”
DENTIN CLASSIFICATION
Typical radiographic appearance of internal root (dentin) resorption.
Why does this tooth appear pink?
DENTIN CLASSIFICATION
Internal resorption with root perforation (arrow)
dentin tubules
“giant cells”
DENTIN CLASSIFICATION
Area of normal tubular dentin (arrow) & area osteodentin.
Note multinucleated giant cells resorbing both calcified reparative tissue & primary dentin.
DENTIN CLASSIFICATION
Types of dentin: inter & intra globular dentin
Inter = between
Intra = within
DENTIN CLASSIFICATION
Types of dentin: sclerotic/transparent dentin
www.kck.usm.my/ppsg/histology/ Histopathology_of_dental_Dental_caries_1.ppt -
CLINICAL CORRELATIONS
Cavity preparation in dentin1. How does a knowledge of dentin affect cavity preparation? a. amputation of
odontoblastic processes
b. communication to pulp
c. placement of bases, pulp injury (heat, acid etch, etc.)
d. progression of caries
bacteria
CLINICAL CORRELATIONS
Note areas of demineralization
“Rampant” Caries
Clinical Correlations
2. What makes dentinstructure susceptible to caries?
A. Dentin has a tubular structure.
B. Caries can spread along DEJ.
C. Crystals dissolve at low pH produced by cariogenic bacteria.
CLINICAL CORRELATIONS
Horizontal clefting right angle to dentinal tubules.
Bacterial beading, coalescence, clefting typifies progression of dentinal caries.
CLINICAL CORRELATIONS
3. What is dentin hypersensitivity? Why is dentin sensitive?
Pain due to communication between outside environment & pulp.
3 Theories of dentin hypersensitivity. (Fig. 8-61)
CLINICAL CORRELATIONS
Dentin hypersensitivity
Loose/defective restoration Dessication forces
CLINICAL CORRELATIONS
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