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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. What are the etiological factors of tubercle?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Trauma - pressure or metabolic disease
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
The enamel organ - dental papilla - dental sac

2. What is the main process involved in initiation?
Enamel organ invaginates into the dental papilla
Dental papilla
Induction
Absence of single or multiple teeth

3. What are the mature cells for alveolar bone?
Osteocytes
Cuboidal cells
Cementoblasts
Enamel organ

4. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
A mineralized cylinder - the dentinal tubule
Preameloblasts
Tooth germ tries to divide
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing

5. Where is the enamel matrix secreted from by the ameloblasts?

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6. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The tooth germ
Tooth germ
Development of one or more extra teeth

7. What will the dental papilla eventually form?
Future dentin and pulp tissue
The basement membrane
The ameloblasts
Trauma - pressure or metabolic disease

8. What are the clinical ramifications of gemination?

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9. What is 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
Alveolar bone
Tooth germ tries to divide
Epithelial rests of Malassez

10. What is the cementum matrix called?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoid
Future dentin and pulp tissue

11. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
The basement membrane
Initiation
Tooth germ

12. What is dens in dente?
Outer
Enamel organ invaginates into the dental papilla
Cementoblasts
Cementocytes

13. What hard tissue has vascularity?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Imbrication lines of von Ebner
Alveolar bone
Lines of Retzuis

14. What are the clinical ramifications of enamel dysplasia?
Dental follicle
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

15. What else undergoes proliferation in the bud stage besides the dental lamina?
Cementoblasts
The ectomesenchyme
Absence of single or multiple teeth
Union of root structure of two or more teeth by cementum

16. The oral epithelium is induced by the ectomesenchyme to produce what?
Tall columnar cells
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental lamina
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

17. What type of tissue is dentin - cementum - and alveolar bone?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Connective
Faulty development of enamel from interference involving ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

18. What are the major components of the tooth germ?
Epithelial
Differentiation
The enamel organ - dental papilla - dental sac
Abnormally small teeth

19. What are the incremental lines for cementum and alveolar bone?
The ectomesenchyme - which was influenced by the neural crest cells
The ectomesenchyme
In the cap stage
Arrest and reversal lines

20. When does the tooth bud become a tooth germ?
Lines of Retzuis
In the cap stage
The ectomesenchyme - which was influenced by the neural crest cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

21. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
As a result of the apposition of cementum over dentin
The ameloblasts
Initiation

22. What will the inner cells of the dental lamina differentiates into?
Enamel pearl - enamel dysplasia - and concresence
Enamel
Apposition of the cementum
The primordium of the pulp

23. Where is the dental sac originally derived from?
The permanent molars
There are none - they are lost with eruption
The ectomesenchyme
A mineralized cylinder - the dentinal tubule

24. What are the cell layers found in the enamel organ in the bell stage?
8th week
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel
Hereditary

25. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Tooth germ
The basement membrane
Cuboidal cells
Dental tissues secreted as matrix in successive layers.

26. What is the predominate process of the cap stage?
Displacement of ameloblasts to root surface
Morphogenesis
Enamel organ invaginates into the dental papilla
Large single rooted tooth with one pulp cavity and exhibits 'twinning' in crown area. normal number of teeth in dentition. may cause problems in appearance and spacing

27. What is the function of the Hertwig's epithelial root sheath?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental lamina

28. What is the cap in the cap stage?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Connective
The enamel organ
The stellate reticulum

29. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The ectoderm
Compressed layer of flat to cuboidal cells
Dentin and alveolar bone

30. What are the clinical ramifications of enamel pearl?
Maturation
Dental papilla
May be confused as calculus deposit on root
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

31. What are the etiological factors of enamel dysplasia?
The stellate reticulum
Local or systemic or hereditary
Apposition of the cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

32. What are the etiological factors for anodontia?
May be confused as calculus deposit on root
Osteocytes
The ectoderm
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

33. What is the process involved in the maturation stage?
Initiation stage
Maturation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoblasts

34. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The basement membrane
Inner
There are none - they are lost with eruption

35. What are the clinical ramifications of fusion?
Enamel organ invaginates into the dental papilla
11th to 12th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane

36. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Common with permanent maxillary molars
Odontoblastic process
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Outer

37. What are the clinical ramifications of concrescence?
The primordium of the pulp
Dental follicle
Hereditary
Common with permanent maxillary molars

38. What are the mature cells for cementum?
Cementocytes
Cementoid
Dental papilla
8th week

39. What stage does the dental tissues subsequently fully mineralize
Hereditary in localized form. endocrine dysfunction is complete
The dental lamina
Dentin secreting cells (odontoblats)
Maturation

40. What layer serves as protection for the enamel organ?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The outer enamel epithelium
8th week
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

41. What processes are involved with the apposition stage?
Morphogenesis
Hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction - proliferation

42. What are the clinical ramifications?
The cervical loop
The primordium of the pulp
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common on permanent molars or cingulum of anterior teeth

43. Tooth development
The enamel organ is compressed
The tooth germ
Trauma - pressure or metabolic disease
Odontogenesis

44. What are the development disturbances of the apposition and maturation stages?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Epithelial
Enamel pearl - enamel dysplasia - and concresence
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

45. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The tooth germ
Cementoblasts
9th to 10th weeks
The primordium of the pulp

46. What are the formative cells for alveolar bone?
The bud stage
Epithelial rests of Malassez
Differentiation
Osteoblasts

47. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
4 types
The dental sac
Odontoblasts
The outer cells of the dental papilla and the central cells of the dental papilla

48. What are the processes involved in the cap stage?
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 bud stage
Proliferation - differentiation - morphogenesis
Odontoclasts

49. What happens during the appositional stage?
Cementocytes
Alveolar bone
Outer
The enamel - dentin - and cementum are secreted in successive layers

50. What stage does anodontia occur?
Common on permanent molars or cingulum of anterior teeth
Absence of single or multiple teeth
Initiation stage
The apposition of the enamel matrix