TCDHA Histology Midterm-Final | | |
Exam with accurate detailed | | | |
answers
What is enamel? - Correct answer ✔Hardest calcified/mineralized tissue in the
| | | | | | | | | | |
human body |
Covers Anatomical crown
| |
What is the blood supply of enamel? - Correct answer ✔Avascular and non-vital
| | | | | | | | | | | |
(has no nerves)
| | |
What is the material makeup of enamel? - Correct answer ✔96% inorganic
| | | | | | | | | | | |
(mineralized) material - mainly calcium hydroxyapatite | | | | |
3% water
|
1% organic - enamelin (protein component)
| | | | |
What color is enamel? - Correct answer ✔It is grayish/bluish white but appears
| | | | | | | | | | | | |
slightly yellow b/c its translucent and the underlying dentin is yellowish
| | | | | | | | | |
What is amelogenesis - Correct answer ✔Process of enamel matrix formation
| | | | | | | | | |
Where is enamel matrix derived from? - Correct answer ✔Enamel matrix is
| | | | | | | | | | | |
ectodermal and is derived from inner enamel epithelium (IEE) of enamel organ
| | | | | | | | | | |
,What stage does amelogenesis occur in? - Correct answer ✔During the
| | | | | | | | | | |
appositional stage (formation of enamel/dentin matrix) of tooth development
| | | | | | | |
What is enamel matrix composed of? - Correct answer ✔At first is composed of
| | | | | | | | | | | | | |
proteins, carbohydrates and small amounts of calcium hydroxyapatite crystals
| | | | | | | |
it DOES NOT contain proteins like dentin, cementum and alveolar bone
| | | | | | | | | |
What must be present in amelogenesis? - Correct answer ✔Dentin must be
| | | | | | | | | | | |
present
Where is enamel first formed? - Correct answer ✔Enamel is first formed in the
| | | | | | | | | | | | | |
cusp/ tip area of a tooth
| | | | |
Ameloblasts - Correct answer ✔Produce enamel matrix
| | | | | |
Tomes process - Correct answer ✔- secretes enamel matrix
| | | | | | | |
- 6 sided pyramidal shaped projection of ameloblast facing DEJ
| | | | | | | | |
( guiding factor of laying down enamel)
| | | | | |
Where is enamel present in? - Correct answer ✔It is present on the anatomical
| | | | | | | | | | | | | |
crown area ONLY | |
Enamel pearl - Correct answer ✔Small, spherical enamel projections on root
| | | | | | | | | | |
surface
,Enamel dysplasia - Correct answer ✔Faulty development of enamel
| | | | | | | |
Deepened pits and fissures - Correct answer ✔Is common and occurs when
| | | | | | | | | | | |
ameloblasts back into one another during stage of apposition, cutting off their
| | | | | | | | | | | |
source of nutrition, which causes incomplete maturation of enamel matrix
| | | | | | | | |
(These areas may become target areas for dental caries)
| | | | | | | |
Sealants - Correct answer ✔used in the prevention of caries
| | | | | | | | |
What is mineralization? (Complete/incomplete/immediate/not immediate) -
| | | | | |
Correct answer ✔It is complete and immediate
| | | | | |
What do ameloblasts actively pump? - Correct answer ✔Ameloblasts actively
| | | | | | | | | |
pump calcium hydroxyapatite into the forming enamel matrix as it is secreted
| | | | | | | | | | | |
by tome's process
| |
What do ameloblasts become part of after enamel apposition? - Correct answer
| | | | | | | | | | | |
✔When ameloblasts are finished with enamel apposition and maturation, they
| | | | | | | | | |
become part of the Reduced Enamel Epithelium (REE)
| | | | | | |
What happens to ameloblasts after tooth erupts? - Correct answer
| | | | | | | | | |
✔Ameloblasts are then lost forver once tooth erupts, therefore prevent further| | | | | | | | | | |
apposition of enamel | |
, How does a newly erupted tooth continue to mineralize? - Correct answer ✔A
| | | | | | | | | | | | |
newly erupted tooth will continue to mineralize post-eruption by taking up
| | | | | | | | | | |
materials from saliva | |
Enamel rod - Correct answer ✔Structural unit of enamel
| | | | | | | |
What is enamel composed of? - Correct answer ✔Enamel is composed of
| | | | | | | | | | | |
millions of enamel rods surrounded by interrod enamel (tail) and rod sheaths )
| | | | | | | | | | | | |
microscopic spaces between rods | | |
What shape are enamel rods? - Correct answer ✔Key hole shaped (head in
| | | | | | | | | | | | |
between 2 adjacent tails) | | |
Interlocking patter adds strength and durability | | | | |
Head point occlusally (crown), tails point cervically (Root)
| | | | | | |
How are enamel rods aligned? - Correct answer ✔Rods are aligned
| | | | | | | | | | |
perpendicular to the dentinoenamel junction (DEJ), except in the vercial | | | | | | | | | |
regions of permanent teeth | | |
Where are enamel rods thickest and thinnest? - Correct answer ✔Rods are
| | | | | | | | | | | |
thickest at the cusps and thinnest at CEJ
| | | | | | |
Lines of retzius (enamel) - Correct answer ✔Seen with transmitted light
| | | | | | | | | |
Are concentric series of bands, on the enamel rods, represent incremental
| | | | | | | | | | |
growth lines that extend from DEJ
| | | | |
Exam with accurate detailed | | | |
answers
What is enamel? - Correct answer ✔Hardest calcified/mineralized tissue in the
| | | | | | | | | | |
human body |
Covers Anatomical crown
| |
What is the blood supply of enamel? - Correct answer ✔Avascular and non-vital
| | | | | | | | | | | |
(has no nerves)
| | |
What is the material makeup of enamel? - Correct answer ✔96% inorganic
| | | | | | | | | | | |
(mineralized) material - mainly calcium hydroxyapatite | | | | |
3% water
|
1% organic - enamelin (protein component)
| | | | |
What color is enamel? - Correct answer ✔It is grayish/bluish white but appears
| | | | | | | | | | | | |
slightly yellow b/c its translucent and the underlying dentin is yellowish
| | | | | | | | | |
What is amelogenesis - Correct answer ✔Process of enamel matrix formation
| | | | | | | | | |
Where is enamel matrix derived from? - Correct answer ✔Enamel matrix is
| | | | | | | | | | | |
ectodermal and is derived from inner enamel epithelium (IEE) of enamel organ
| | | | | | | | | | |
,What stage does amelogenesis occur in? - Correct answer ✔During the
| | | | | | | | | | |
appositional stage (formation of enamel/dentin matrix) of tooth development
| | | | | | | |
What is enamel matrix composed of? - Correct answer ✔At first is composed of
| | | | | | | | | | | | | |
proteins, carbohydrates and small amounts of calcium hydroxyapatite crystals
| | | | | | | |
it DOES NOT contain proteins like dentin, cementum and alveolar bone
| | | | | | | | | |
What must be present in amelogenesis? - Correct answer ✔Dentin must be
| | | | | | | | | | | |
present
Where is enamel first formed? - Correct answer ✔Enamel is first formed in the
| | | | | | | | | | | | | |
cusp/ tip area of a tooth
| | | | |
Ameloblasts - Correct answer ✔Produce enamel matrix
| | | | | |
Tomes process - Correct answer ✔- secretes enamel matrix
| | | | | | | |
- 6 sided pyramidal shaped projection of ameloblast facing DEJ
| | | | | | | | |
( guiding factor of laying down enamel)
| | | | | |
Where is enamel present in? - Correct answer ✔It is present on the anatomical
| | | | | | | | | | | | | |
crown area ONLY | |
Enamel pearl - Correct answer ✔Small, spherical enamel projections on root
| | | | | | | | | | |
surface
,Enamel dysplasia - Correct answer ✔Faulty development of enamel
| | | | | | | |
Deepened pits and fissures - Correct answer ✔Is common and occurs when
| | | | | | | | | | | |
ameloblasts back into one another during stage of apposition, cutting off their
| | | | | | | | | | | |
source of nutrition, which causes incomplete maturation of enamel matrix
| | | | | | | | |
(These areas may become target areas for dental caries)
| | | | | | | |
Sealants - Correct answer ✔used in the prevention of caries
| | | | | | | | |
What is mineralization? (Complete/incomplete/immediate/not immediate) -
| | | | | |
Correct answer ✔It is complete and immediate
| | | | | |
What do ameloblasts actively pump? - Correct answer ✔Ameloblasts actively
| | | | | | | | | |
pump calcium hydroxyapatite into the forming enamel matrix as it is secreted
| | | | | | | | | | | |
by tome's process
| |
What do ameloblasts become part of after enamel apposition? - Correct answer
| | | | | | | | | | | |
✔When ameloblasts are finished with enamel apposition and maturation, they
| | | | | | | | | |
become part of the Reduced Enamel Epithelium (REE)
| | | | | | |
What happens to ameloblasts after tooth erupts? - Correct answer
| | | | | | | | | |
✔Ameloblasts are then lost forver once tooth erupts, therefore prevent further| | | | | | | | | | |
apposition of enamel | |
, How does a newly erupted tooth continue to mineralize? - Correct answer ✔A
| | | | | | | | | | | | |
newly erupted tooth will continue to mineralize post-eruption by taking up
| | | | | | | | | | |
materials from saliva | |
Enamel rod - Correct answer ✔Structural unit of enamel
| | | | | | | |
What is enamel composed of? - Correct answer ✔Enamel is composed of
| | | | | | | | | | | |
millions of enamel rods surrounded by interrod enamel (tail) and rod sheaths )
| | | | | | | | | | | | |
microscopic spaces between rods | | |
What shape are enamel rods? - Correct answer ✔Key hole shaped (head in
| | | | | | | | | | | | |
between 2 adjacent tails) | | |
Interlocking patter adds strength and durability | | | | |
Head point occlusally (crown), tails point cervically (Root)
| | | | | | |
How are enamel rods aligned? - Correct answer ✔Rods are aligned
| | | | | | | | | | |
perpendicular to the dentinoenamel junction (DEJ), except in the vercial | | | | | | | | | |
regions of permanent teeth | | |
Where are enamel rods thickest and thinnest? - Correct answer ✔Rods are
| | | | | | | | | | | |
thickest at the cusps and thinnest at CEJ
| | | | | | |
Lines of retzius (enamel) - Correct answer ✔Seen with transmitted light
| | | | | | | | | |
Are concentric series of bands, on the enamel rods, represent incremental
| | | | | | | | | | |
growth lines that extend from DEJ
| | | | |
