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WorksheetsDHE 121 Week 8 Tooth Development
Total questions: 80
Worksheet time: 1hrs 2mins
This is the main stage of tooth development beginning during the 6th to 7th week.
(a)
The histologic features of this main process: ectoderm lining stomodeum gives rise to the oral epithelium, and then to the dental lamina adjacent to deeper ectomesenchyme which is derived from the NCC's.
Both tissue types are separated by a basement membrane. Name the main process.
(a)
Growth of the dental lamina into bud shape that penetrates growing ectomesenchyme occurs during what stage/process?
Bud stage 8th week, proliferation
Bud stage 8th week, differentiation
Bud stage 8th week, morphogenesis
Formation of tooth germ as enamel organ forms into cap shape that surrounds the inside mass of dental papilla, with an outside mass of dental sac, both from ectomesenchyme occurs during what stage/process?
Cap stage at 9th to 10th week, proliferation, differentiation, and morphogenesis
Cap stage at 9th to 10th week, proliferation and differentiation
Cap stage at 9th to 10th week, differentiation and morphogenesis
Differentiation of enamel organ into the bell shape with 4 cell types and dental papilla into 2 types occurs during what stage/process?
Bell stage at 11-12th week, proliferation, differentiation, and morphogenesis
Bell stage at 11-12th week, proliferation and differentiation
Bell stage at 11-12th week, differentiation and morphogenesis
Dental tissue types secreted in successive layers as matrix occurs during what stage/process?
Apposition stage at various times, induction and proliferation
Apposition stage at various times, proliferation
Apposition stage at various times, differentiation
Dental tissue types fully mineralize to mature form during what stage/process?
Maturation stage at various times, maturation
Maturation stage at various times, morphogenesis and maturation
Maturation stage at various times, differentiation, morphogenesis, and maturation
The formative cells for enamel are:
(a)
The formative cells for dentin are:
(a)
The formative cells for cementum are:
(a)
The formative cells for the alveolar process are:
(a)
During the end of the 7th week, the oral epithelium grows deeper into the ectomesenchyme as is induced to produce a layer:
(a)
Diagnosis: Anodontia
Stage: Initiation Stage
Cause: Lack of initiation of cells
Hereditary
Diagnosis: Hypodontia
Stage: Initiation Stage
Cause: Lack of initiation of cells
Hereditary
Diagnosis: Hypodontia or Partial Anodontia
Stage: Initiation Stage
Cause: Lack of initiation of cells
Hereditary
Diagnosis: Hypodontia or Partial Anodontia
Stage: Initiation Stage
Cause: Lack of initiation of cells
Hereditary or Developmental
Diagnosis: Hyperdontia or Supernumery Teeth
Stage: Initiation Stage
Cause: Too many cells in initiation stage
Hereditary
Diagnosis: Hyperdontia or Supernumery Teeth
Stage: Initiation Stage
Cause: Too many cells in differentiation stage
Hereditary or developmental
Diagnosis: Mesiodens (between 8,9)
Stage: Initiation Stage
Cause: Too many cells in initiation stage
Hereditary
Diagnosis: Mesiodens (between 8,9)
Stage: Proliferation Stage
Cause: Too many cells in initiation stage
Hereditary
Diagnosis: Microdontia, Peg Lateral
Stage: Bud Stage
Cause: Too little cells in proliferation stage
Hereditary
Diagnosis: Microdontia, Peg Lateral
Stage: Bud Stage
Cause: Too many cells in proliferation stage
Hereditary and Developmental
At the end of the proliferation process involving the dental lamina of the primary dentition, both the future maxillary arch and mandibular arch will each have (a) buds.
The process of tooth development is called:
(a)
What is the most predominant process occurring during the cap stage?
(a)
The dental papilla gives rise to: (separate your answers with an and)
(a)
Name the structure.
(a)
(a)
The white space:
(a)
The dental sac gives rise to what supporting structures:
cementum
PDL
alveolar process
tongue
The pink cells are:
(a)
The tooth germ consists of the:
Enamel Organ
Dental Papilla
Dental Sac/Follicle
(a)
(a)
(a)
Cap Stage- Morphogenesis- Tooth Germ
Cap Stage- Maturation- Tooth Germ
Cap Stage- Induction- Tooth Germ
This directs traffic of cells in development for an incisal edge or posterior occlusal cusp development
(a)
Diagnosis: Dens in Dente
Stage: Cap Stage
Cause: Secretion of enamel cells malfunctioned, and the sides ended up folding in on each other
Hereditary
Diagnosis: Fusion
Stage: Cap Stage
Cause: Secretion of enamel cells malfunctioned, and the sides ended up folding in on each other
Hereditary
Diagnosis: Gemination
Stage: Cap Stage
Cause: Tooth germ tried to divide, but develops 1 large single-rooted tooth with one pulp cavity
Hereditary
Diagnosis: Fusion
Stage: Cap Stage
Cause: Tooth germ tried to divide, but develops 1 large single-rooted tooth with one pulp cavity
Developmental
Diagnosis: Fusion
Stage: Cap Stage
Cause: Trauma, crowding during development/union of 2 adjacent tooth germs that result in large tooth with 2 pulp cavities
Developmental
Diagnosis: Germination
Stage: Cap Stage
Cause: Trauma, crowding during development/union of 2 adjacent tooth germs that result in large tooth with 2 pulp cavities
Developmental
Stellate Reticulum and the Stratum Intermedium within the enamel organ are derived from:
(a)
The dental papilla is derived from:
(a)
Outer cells of dental papilla, differentiate into dentin secreting cells called:
(a)
enamel, dentin, and cementum are secreted in successive layers during this stage:
(a)
an extracellular substance that is partially calcified yet serves as a framework for later calcification is the:
(a)
(a) is reached when the dental tissue types subsequently fully mineralize.
The time period of the Apposition/Secretory stage and Maturation stage varies according to the tooth involved.
True
False
During the bell stage, there are 4 different types of cells found within the the enamel organ. Select them.
Outer enamel epithelium (OEE)
Inner enamel epithelium (IEE)
Stellate reticulum
Stratum intermedium
Basement membrane
This serves as a protective barrier for the enamel organ:
(a)
(a) will differentiate into ameloblasts that form the enamel matrix
_____________ and ____________ supports the production of the enamel matrix.
Stellate reticulum
Basement membrane
Stratum intermedium
Dental lamina
After the formation of the IEE in the bell-shaped enamel organ, the innermost cells grow even more columnar as they elongate and differentiate into____________ lining up alongside the basement membrane.
Preameloblasts
Odontoblasts
Predentin
Select the 1st and 2nd event to occur during preameloblast formation.
1st- IEE, with central nuclei, line up along the basement membrane
1st- OEE, with central nuclei, line up along the basement membrane
2nd- IEE have elongated and re-polarized the nuclei to become preameloblasts. The outer cells of the dental papilla are also lined up on the opposite side of the basement membrane.
2nd- OEE have elongated and re-polarized the nuclei to become preameloblasts. The outer cells of the dental papilla are also lined up on the opposite side of the basement membrane.
What occurs suring this stage?
Preameloblasts start dentinogenesis- the appositional growth of predentin on their side of the basement membrane
Odontoblasts start dentinogenesis- the appositional growth of predentin on their side of the basement membrane
What occurs during this stage?
Outer cells of the dental papilla line up along the basement membrane with repolarization of the nuclei to become odontoblasts.
Inner cells of the dental papilla line up along the basement membrane with repolarization of the nuclei to become odontoblasts.
The picture depicts preameloblasts being induced to differentiate into___________ and beginning amelogenesis from Tomes process (inside arrow, grey projection) with appositional growth of _____________ on their side of the basement membrane.
ameloblasts, enamel matrix
odontoblasts, enamel matrix
ameloblasts, dentin matrix
Later, the basement membrane will disintegrate and mineralize to form the ____________ .
dentinoenamel junction (DEJ)
dentin matrix
enamel matrix
The predentin (in yellow) is thicker than the enamel matrix because the ___________ differentiate and start matrix production for the most part earlier than the _____________.
odontoblasts, ameloblasts
odontoblasts, pulp
odontoblasts, DEJ
the faulty development of enamel:
(a)
1. Local Enamel Dysplasia : may result from trauma or infection occurring in a small group of ameloblasts.
2. Systemic Enamel Dysplasia : involves larger numbers of ameloblasts and may result from traumatic birth, systemic infections, nutritional deficiencies, or dental fluorosis.
First statement true, second false
First statement false, second true
Both true
Both false
Faulty apposition affects (a) of enamel and dentin.
Faulty maturation affects (a) of enamel and dentin.
Faulty development of both apposition and maturation can occur simultaneously.
True
False
Diagnosis: Hutchinson's Incisors
Stage: Apposition Stage
Cause: Lack of enamel liquid (quantity)
Hereditary
Diagnosis: Hutchinson's Incisors
Stage: Apposition Stage
Cause: Lack of enamel liquid (quality)
Developmental
Diagnosis: Mulbery Molars
Stage: Apposition Stage
Cause: Lack of enamel liquid (quantity)
Hereditary (syphilis)
Diagnosis: Mulbery Molars
Stage: Apposition Stage
Cause: Lack of enamel liquid (quality)
Hereditary and Developmental (syphilis)
Diagnosis: Pitting of enamel
Stage: Apposition Stage
Cause: Lack of enamel liquid (quantity)
Hereditary and Developmental (malnutrition)
Diagnosis: Pitting of enamel
Stage: Apposition Stage
Cause: Lack of enamel liquid (quantity)
Hereditary
Hutchinson's Incisors, Mulbery Molars, and Pitting of enamel are examples of:
(a)
Diagnosis: Amelogenesis Imperfecta
Stage: Apposition and Maturation Stage
Cause: Lack of enamel liquid (quantity) and lack of (quality) of enamel maturation
Hereditary
Diagnosis: Amelogenesis Imperfecta
Stage: Apposition and Maturation Stage
Cause: Lack of enamel liquid (quantity) and lack of (quality) of enamel maturation
Developmental
Diagnosis: Dental Fluorosis
Stage: Maturation Stage
Cause: Reduction in the (quality) of enamel maturation
Developmental and Hereditary
Diagnosis: Dental Fluorosis
Stage: Maturation Stage
Cause: Reduction in the (quality) of enamel maturation
Hereditary
Diagnosis: Dentinogenesis Imperfecta
Stage: Maturation Stage
Cause: Reduction in the (quality) of dentin maturation
Hereditary
Diagnosis: Dentinogenesis Imperfecta
Stage: Maturation Stage
Cause: Reduction in the (quality) of dentin maturation
Hereditary and Developmental
When the outer cells of the OEE join the inner cells of the the IEE, it forms the: (red arrow)
(a)
This structure is formed from the elongation of the cervical loop: (red arrow)
(a)
The Hertwig epithelial root sheath (HERS) morph into (a) secreting cells in the cervical loop area
Diagnosis: Enamel Pearl
Stage: Apposition and maturation stage of root development
Cause: misplaced ameloblasts migrate to the surface of the root
Developmental
Diagnosis: Enamel Pearl
Stage: Apposition stage of root development
Cause: misplaced ameloblasts migrate to the surface of the root
Hereditary
Diagnosis: Dilaceration
Stage: Apposition and maturation stage of root development
Cause: distortion of HERS due to an injury or pressure
Developmental
Diagnosis: Dilaceration
Stage: Apposition stage of root development
Cause: distortion of HERS due to an injury or pressure
Hereditary
Diagnosis: Accessory Roots
Stage: Apposition and maturation stage of root development
Cause: trauma, pressure, or metabolic disease that affects HERS
Genetic
Diagnosis: Accessory Roots
Stage: Apposition and maturation stage of root development
Cause: trauma, pressure, or metabolic disease that affects HERS
Developmental
The process of (a) from appositional growth of cementum in the root area also occurs when the HERS disintegrates.
The disintegration of the HERS allows undifferentiated cells of the dental sac to contact the newly formed surface of root dentin.
This contact of the dental sac cells with the dentin surface induces these cells to become immature (a) ?
Cementoblasts move to cover root dentin and undergo cementogenesis, laying down cementum matrix.
Unlike ameloblasts and odontoblasts, which leave no cellular bodies in their secreted products, many cementoblasts become entrapped by the cementum they produce and become mature (a) in the later stages of appositional growth.
As a result of appositional growth of cementum over the dentin, the (a) is formed where the disintegrating basement membrane between the 2 tissue types was located.
____________ becomes mineralized bodies in the cementum and PDL
Epithelial rests of Malassez
Stratum intermedium
Stellate reticulum
Outer enamel epithelium
Diagnosis: Concrescence
Stage: Apposition and Maturation stage
Cause: overproduction of cementum
Developmental
Diagnosis: Concrescence
Stage: Apposition and Maturation stage
Cause: overproduction of cementum
Hereditary
The outer enamel epithelium, stellate reticulum, stratum intermedium, and ameloblasts are compressed to form the:
(a)
The cuticle, also known as the (a) , secretes enzymes to start the feeding process creating an opening for the tooth to move into the oral cavity
The (a) functions to shape the root(s) by inducing dentin formation.
