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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. Where does the primordium of the permanent dentition develop?
Common on permanent molars or cingulum of anterior teeth
The ectomesenchyme - which was influenced by the neural crest cells
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues secreted as matrix in successive layers.

2. What is macrodontia?
Abnormally large teeth
Odontogenesis
In the cap stage
6th to 7th weeks

3. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Morphogenesis
Differentiation - proliferation - morphogenesis
Displacement of ameloblasts to root surface

4. What is the time span for the bud stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation stage
8th week
Compressed layer of flat to cuboidal cells

5. What are the mature cells for cementum?
Cementoblasts
Initiation stage
The ameloblasts
Cementocytes

6. Which layer in the bell stage has star shaped cells?
Osteocytes
The stellate reticulum
Maturation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

7. What are the clinical ramifications of enamel dysplasia?
Proliferation - differentiation - morphogenesis
Preameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
4 types

8. What are the incremental lines for cementum and alveolar bone?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation - proliferation - morphogenesis
Arrest and reversal lines
Local or systemic or hereditary

9. What is microdontia?
8th week
Abnormally small teeth
When the gingiva recedes and no actual tooth movement takes place
Common with permanent maxillary molars

10. What is the time span for the bell stage?
Common with permanent maxillary molars
Proliferation - differentiation - morphogenesis
11th to 12th weeks
Displacement of ameloblasts to root surface

11. What is tubercle?
Only dentinal tubules with processes
Extra cusp due to effects on enamel organ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer enamel epithelium

12. What is the embryological background for dentin - cementum and alveolar bone?
Dentin secreting cells (odontoblats)
Odontoblasts
Cementocytes
Dental papilla

13. What happens during the bud stage?
Dentin secreting cells (odontoblats)
Abnormally large teeth
Maturation
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

14. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
The actual vertical movement of the tooth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental papilla

15. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The permanent molars
Local or systemic or hereditary
Odontoblastic process

16. What are the processes involved in the cap stage?
The bud stage
6th to 7th weeks
Dentin secreting cells (odontoblats)
Proliferation - differentiation - morphogenesis

17. Where is the dental sac originally derived from?
The enamel organ
The ectomesenchyme
Enamel
Differentiation - proliferation - morphogenesis

18. How many types of cells are found in the enamel organ in the bell stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The dental sac
Union of 2 adjacent tooth germs
4 types

19. What are the clinical ramifications of supernumerary teeth?
Tall columnar cells
Odontoblastic process
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The stellate reticulum

20. What wll the inner enamel epithelium differentiate into?
The ectomesenchyme - which was influenced by the neural crest cells
Enamel secreting cells (ameloblasts)
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer cells of the dental papilla and the central cells of the dental papilla

21. Which teeth are nonsuccedaneous?
The permanent molars
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The cervical loop
Differentiation - proliferation - morphogenesis

22. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The tooth germ
Dental papilla
Enamel secreting cells (ameloblasts)

23. What are the etiological factors for enamel pearl?
The dental sac
Hereditary
Displacement of ameloblasts to root surface
Dental tissues fully mineralize to their mature levels.

24. What processes are involved with the apposition stage?
The dental lamina
Induction - proliferation
There is unequal growth in different parts of the tooth bud
The stellate reticulum

25. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Preameloblasts
Sphere of enamel on root
The basement membrane

26. What else undergoes proliferation in the bud stage besides the dental lamina?
Hereditary
The ectomesenchyme
Osteocytes
Outer

27. The preameloblasts induce dental papilla cells to differentiate into what?
4 types
A bilayer rim that consists only IEE and OEE
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Into odontoblasts

28. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Tall columnar cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Inner

29. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
The dental sac
Enamel organ forms into cap - surrounding mass of dental papilla from the ectomesenchyme and surrounded by mass of dental sac also from the ectomesenchyme. Formation of the tooth germ.
The ectomesenchyme

30. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Proliferation
The basement membrane
Enamel pearl - enamel dysplasia - and concresence

31. What are the mature cells for alveolar bone?
Proliferation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Osteocytes
Osteoblasts

32. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentin and alveolar bone
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

33. What are the formative cells for dentin?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoblasts
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells

34. What is the cementum matrix called?
Cementoid
9th to 10th weeks
Union of root structure of two or more teeth by cementum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

35. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The apposition of the enamel matrix
Tall columnar cells

36. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Dens in dente - gemination - tubercle - and fusion
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
9th to 10th weeks
Epithelial rests of Malassez

37. What is dens in dente?
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
Absence of single or multiple teeth
Enamel organ invaginates into the dental papilla
The bud stage

38. When does dens in dente occur?
During the cap stage
In the cap stage
Arrest and reversal lines
Inner

39. What hard tissue is can not have tissue formation after eruption?
Bud stage
Enamel
Dental papilla
Arrest and reversal lines

40. What is the function of the Hertwig's epithelial root sheath?
The basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
There is unequal growth in different parts of the tooth bud
Odontoblastic process

41. What happens during initiation?
Compressed layer of flat to cuboidal cells
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
Development of one or more extra teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

42. What are entrapped cementoblasts called?
The basement membrane
Enamel organ
Cementocytes
Common on permanent molars or cingulum of anterior teeth

43. What is the time span for the cap stage?
9th to 10th weeks
Lines of Retzuis
Extra cusp due to effects on enamel organ
Epithelial rests of Malassez

44. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Abnormally small teeth
Enamel secreting cells (ameloblasts)
The outer enamel epithelium

45. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Alveolar bone
Abnormally large teeth
Dental papilla
Cementoblasts

46. What will the dental papilla eventually form?
Future dentin and pulp tissue
Dental follicle
The basement membrane that seperates the enamel organ and dental papilla
Ameloblasts

47. What is the predominate process in the bell stage?
The ectomesenchyme
Hereditary
The enamel - dentin - and cementum are secreted in successive layers
Differentiation

48. What is the main process involved in initiation?
The enamel organ - dental papilla - dental sac
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Induction
The cervical loop

49. What hard tissue has vascularity?
Extra cusp due to effects on enamel organ
The ectomesenchyme
Alveolar bone
Epithelial

50. What are the formative cells for alveolar bone?
There are none - they are lost with eruption
4 types
Osteoblasts
Union of root structure of two or more teeth by cementum