tissue within a tooth which is formed by fibroblasts and mesenchymal cells, which differentiate into blood vessels and nerve tissue
which layer of the pulp continues to grow?
out layer which contains odontoblast, the odontoblastic layer.
what kind of pulp carries the nerve and blood supply fr the apex of the root to the pulp chamber
the cell-free zone aka the subodontoblastic plexus under the odontoblastic layer is also called
plexus of Raschkow
lump of calcified tissue sometimes known as a pulp stone
what's the difference between a true and false denticle?
true denticle show traces of odontoblast (dentin)
what type of cells form dentin?
the beginning of dentinogenesis starts with the odontoblast secreting what?
predentin (which eventually mineralizes into dentin)
layer formation of the dentinal matrix
where do odontoblast start forming dentin?
at the DEJ (dental-enamel junction) and developes inward towards the pulp
layer of dentin closest to the DEJ is called the
-contains heavy coarse collagen fibers called Korff's fibers.
heayv coarse collagen fibers which extend from fibroblasts towards the inner enamel epithelium, forming bundles that make up the dentin matrix
what color is secondary dentin?
irregular, secondary dentin which forms in response to pathological stimuli
reactive, reparative, or tertiary dentin
dentin matrix that forms imperfectly between calcified globules under the DEJ
dentin found between the dentinal tubules
more calcified form of dentin, which forms in repsonse to stimuli after the roots are complete
when dentinal tubules calcify to produce translucency
sclerotic or transparent dentin
dentin matrix that forms imperfect globules found under the CEJ
Tome's granular layer
tiny tunnels odontoblasts leave behind
odontoblastic processes also called dentinal tubules which transmit sensitivity
darker incremental lines in mature dentin
Imbrication lines of von Ebner
difference between primary S-shaped curves and secondary S-shaped curves.
primary S-shaped curves are larger and reflects the movement of crowded odontoblasts
Secondary S-shaped curve is a smaller S, seen in the length of the enamel.
true denticles form during
false denticles develop during
enamel:__% inorganic__% organic__% water
how many ameloblast does it take to make 1 enamel rod?
where does enamel originate?
where does ameloblasts of the inner enamel epithelium (which makes enamel) originate?
finger-like projection of ameloblast during the secretory phase of amelogenesis
Apposition of enamel begins where?
at the incisal/occlusal surface
enamel rodes or prisms that makeup the crystalline structure of enmale are dictated by....?
grooves associated with the lines of Retzius
bands that indicate gradual change in enamel production
lines of Rerzius
areas of weakened enamel that were not totally calcified
What are enamel spindles?
when dentin production by odontoblasts cross over into enamel before enamel has a chance to mature
weakened areas of partially calcified enamel that extendfrom the DEJ to a short distance in the enamel
reduced enamel epithelium (REE)
occurs when the secretory phase of amelogenesis creases and ameloblasts shrink fr columnar to cuboidal cells to become a thin layer covering enamel. it includes ameloblasts and stratum intermedium layers. REE can become part of Nasmyth's membrane which can stain green on newly erupted teeth
deficient amount of enamel. harder content but thinner matrix layer, so it yellow-dark brown. enamel appears pitted. caused by trauma, high fever, or too much fluoride.
defect in the mineralization of formed enamel matrix. soft under-calcified enamel that is yellow-dark brown
is fluorosis a form of enamel hypocalcification or enamel hypoplasia?
hypoplasia is harder. hypocalcification is soft.
calcified connective tissue covering root of tooth
what percent inorganc, organic, and water?
what portion of development developes into cementum?
a mode of attachment for a tooth to the periodontal ligament
a thin layer of cementum which forms slowly over the coronal protion of root and does not contain any embedded cementocytes
cementum which is deposited at the apical portion of the root at a rapid rate and in layers. also contains embedded cementocytes
hypercementosis or cemental hyperplasia
cemental spurs: found new CEJ are excessive symmetrical masses of cementum
cementicles: small abnormal calcified masses found in the periodontal liament
hypercementosis or cemental hyperplasia: excessive build up of secondary cementum on the root surface. commonly occurs on apical 2/3 of root.
tooth most likely to have a lingual pit
lateral max incisor
longest tooth in the mouth, also considered the cornerstone
age of eruption of maxillary central incisor
age of eruption of maxillary lateral incisors
age of eruption of maxillary canine
age of eruption of maxillary first premolar
maxillary tooth with a prominent concavity on the mesial aspect but not the distal...aka development depression. also has bifurcated roots
maxillary first premolar
age of eruption of max second premolar
which maxillary premolar has no concavity
the second premolar
the last succedaneous tooth to erupt is
the maxillary canine
largest tooth in max arch
first permenant tooth to erupt in the max arch
first molar (6 yrs)
age of eruption of maxillary first molar
where is the cusp of Carabelli found?
fifth lobe on the mesiolingual cusp
occlusal view: rhomboid shape with an oblique ridge that is uninterrupted by a central groove
roots: 3 roots. lingual is the longest. mesio and distobuccal are more curved
max first molar
occlusal view: four cusp. rhomboid but can be heart-shaped.
max second molar.
age of eruption of maxillary second molar
most anomalies of all permanent teeth
max third molar
age of eruption of max third molar
mandibular canine has two developmental depressions
mesial and distal
anterior tooth with greatest tendency to have a bifurcated root
tooth with Y U or H pattern depending on cusp number
man sec premolar
which root is longer on the man first molar?
what age is best to place sealants?
6 years (6 yr molars), first grade
missing teeth due to missing tooth germs
hereditary condition of enamel hypoplasia
Amelogenesis imperfecta scale
Type 1: yellow-brown color. radiographically, absent or thin on cusps tips
Type 2: enamel is hypocalcified, low mineralization. enamel may fracture. yellow-orange brown color. Radiographically, appears normal, with enamel and dentin having similar density, but enamel looks "moth-eaten"
Type 3: hypomatured. opaque and porous. enamel is normal thickness but softer. can be white at occulsal third.
Type 4: related to taurodontism, hypomatured or hypoplastic enamel. enamel is thin or has pits on facial surfaces and is white-yellow o brown. radiographically, enamel appears normal to slightly more radioopaque than dentin with large pulp chambers
an accessory cusp typically found on mandibular premolars
(don't confuse with dens invaginatus which is like dens in dente)