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Test your basic knowledge |
Dentistry Tooth Development And Eruption
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Study First
Subjects
:
health-sciences
,
dentistry
Instructions:
Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can
study here
.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.
This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. What are entrapped cementoblasts called?
Enamel secreting cells (ameloblasts)
Only dentinal tubules with processes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementocytes
2. What is the outer portion of the ectoderm in the initiation stage?
Bud stage
Oral epithelium
Hereditary
Faulty development of enamel from interference involving ameloblasts
3. What stage does the dental tissues subsequently fully mineralize
Differentiation
Union of root structure of two or more teeth by cementum
Maturation
Common on permanent molars or cingulum of anterior teeth
4. Do odontoblasts start their secretion of matrix before the ameloblasts?
Outer
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Common on permanent molars or cingulum of anterior teeth
Proliferation
5. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
The dental lamina
Tall columnar cells
Tooth germ
Epithelial rests of Malassez
6. What are the clinical ramifications?
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth
Extra cusp due to effects on enamel organ
The tooth germ
7. What is the cementum matrix called?
Cementocytes
Trauma - pressure or metabolic disease
Morphogenesis
Cementoid
8. What do the odontoblasts do?
There are none - they are lost with eruption
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
9. What type of tissue is dentin - cementum - and alveolar bone?
The apposition of the enamel matrix
Odontoblastic process
Connective
Hereditary
10. What is the process involved in the maturation stage?
Preameloblasts
Dental tissues secreted as matrix in successive layers.
Epithelial rests of Malassez
Maturation
11. What hard tissue is can not have tissue formation after eruption?
Inner
Proliferation
Enamel
The tooth germ
12. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
The enamel - dentin - and cementum are secreted in successive layers
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues fully mineralize to their mature levels.
13. What is the embryological background for dentin - cementum and alveolar bone?
The stellate reticulum
Odontogenesis
Hereditary
Dental papilla
14. What are the clinical ramifications of dens in dente?
Induction
Pressure on the area
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Connective
15. What is microdontia?
Differentiation
Connective
Abnormally small teeth
The basement membrane
16. What is tubercle?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Extra cusp due to effects on enamel organ
Tooth germ
Odontoclasts
17. What are the etiological factors for micro/macrodontia?
Compressed layer of flat to cuboidal cells
Odontoblasts
Hereditary in localized form. endocrine dysfunction is complete
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
18. What is the main process involved in the bud stage?
Proliferation
The tooth germ
Initiation
Union of 2 adjacent tooth germs
19. What are supernumerary teeth?
Only dentinal tubules with processes
Development of one or more extra teeth
Sphere of enamel on root
The ectomesenchyme
20. What happens during the maturation stage?
The tooth germ
Osteocytes
The enamel organ - dental papilla - dental sac
Dental tissues fully mineralize to their mature levels.
21. What is dens in dente?
Initiation
Abnormally large teeth
The ameloblasts
Enamel organ invaginates into the dental papilla
22. Where is the enamel matrix secreted from by the ameloblasts?
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23. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dental tissues fully mineralize to their mature levels.
Odontoblastic process
Epithelial
Dentin secreting cells (odontoblats)
24. What are the etiological factors for anodontia?
Outer
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Into odontoblasts
Absence of single or multiple teeth
25. What is the structure responsible for root development?
Dens in dente - gemination - tubercle - and fusion
6th to 7th weeks
The cervical loop
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
26. What are the clinical ramifications of anodontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Ameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
A bilayer rim that consists only IEE and OEE
27. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Abnormally large teeth
Enamel
Extra cusp due to effects on enamel organ
28. How many types of cells are found in the enamel organ in the bell stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Common on permanent molars or cingulum of anterior teeth
Outer
4 types
29. When does the tooth bud become a tooth germ?
When the gingiva recedes and no actual tooth movement takes place
The ameloblasts place an acellular dental cuticle on the new enamel surface
Epithelial rests of Malassez
In the cap stage
30. What kind of cells occur in the inner enamel epithelium?
Hereditary
Tall columnar cells
During the cap stage
The ameloblasts place an acellular dental cuticle on the new enamel surface
31. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The bud stage
Traumatic injury or crowding of teeth
Abnormally large teeth
Odontoclasts
32. What is concrescence?
Union of root structure of two or more teeth by cementum
Alveolar bone
The primordium of the pulp
Connective
33. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Epithelial
34. Where is the enamal organ originally derived from?
Alveolar bone
The dental lamina
The ectoderm
Arrest and reversal lines
35. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Bud stage
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentin secreting cells (odontoblats)
36. What is the function of the Hertwig's epithelial root sheath?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Into odontoblasts
Cementocytes
37. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Apposition of the cementum
There are none - they are lost with eruption
It disintegrates as the developing oral mucosa comes to line the oral cavity
38. Which layer in the bell stage has star shaped cells?
The cementum - PDL - and alveolar bone
The stellate reticulum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
39. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Initiation stage
Preameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
40. What happens during the bell stage?
Lines of Retzuis
The dental lamina
Odontogenesis
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
41. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Pressure on the area
Dental tissues fully mineralize to their mature levels.
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
42. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Initiation stage
When the gingiva recedes and no actual tooth movement takes place
6th to 7th weeks
Dental papilla
43. What are the formative cells for dentin?
Union of root structure of two or more teeth by cementum
The primordium of the pulp
Odontoblasts
Maturation
44. What are the etiological factors for dens in dente and gemination?
The primary tooth can now erupt into the oral cavity - the REE fuses with the oral epithelium - then enzymes from the REE disintegrate the central portion of the epithelial tissue leaving an epithelial tunnel for the tooth to erupt
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Compressed layer of flat to cuboidal cells
45. What are the mature cells for enamel?
Odontoblasts
There are none - they are lost with eruption
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel organ is compressed
46. What are the formative cells for enamel?
Ameloblasts
Hereditary
Faulty development of enamel from interference involving ameloblasts
11th to 12th weeks
47. What is the main process involved in initiation?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Hereditary in localized form. endocrine dysfunction is complete
Connective
Induction
48. What stage does supernumerary teeth occur?
Dental tissues secreted as matrix in successive layers.
The outer cells of the dental papilla and the central cells of the dental papilla
Initiation
Ectoderm lining stomodeum gives rise to the oral epithelium and then to the dental lamina - adjacent to deeper ectomesenchyme - Which is influenced by the neural crest cells. Both tissues are seperated by a basement membrane
49. When does the process of root development take place?
Enamel
Hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoclasts
50. What is the site for the future dentioenamel junction?
Maturation
The basement membrane that seperates the enamel organ and dental papilla
Odontogenesis
Tooth germ