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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 is the time span for initiation?
The ectomesenchyme
The cervical loop
The dental sac
6th to 7th weeks

2. What are the mature cells for alveolar bone?
Odontogenesis
The ectoderm
During the cap stage
Osteocytes

3. What is cementogenisis?
Dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Outer
Apposition of the cementum

4. The oral epithelium is induced by the ectomesenchyme to produce what?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla
The dental lamina
Dentin and alveolar bone

5. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
The stellate reticulum
Odontoblasts

6. What are the odontoblastic processes is contained in what?
Epithelial rests of Malassez
A mineralized cylinder - the dentinal tubule
Absence of single or multiple teeth
Differentiation - proliferation - morphogenesis

7. What else undergoes proliferation in the bud stage besides the dental lamina?
The enamel organ
The ectomesenchyme
Dental tissues secreted as matrix in successive layers.
Absence of single or multiple teeth

8. When does macro/microdontia occur?
Proliferation - differentiation - morphogenesis
Bud stage
The actual vertical movement of the tooth
Imbrication lines of von Ebner

9. What is the embryological background for enamel?
Tooth germ tries to divide
Enamel organ
Faulty development of enamel from interference involving ameloblasts
Bud stage

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

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11. What are the clinical ramifications of fusion?
When the gingiva recedes and no actual tooth movement takes place
May be confused as calculus deposit on root
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental papilla

12. What are the etiological factors of concrescence?
The stellate reticulum
Traumatic injury or crowding of teeth
May be confused as calculus deposit on root
Future dentin and pulp tissue

13. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Dentin secreting cells (odontoblats)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontogenesis

14. What wll the inner enamel epithelium differentiate into?
Extra cusp due to effects on enamel organ
Cementoblasts
As a result of the apposition of cementum over dentin
Enamel secreting cells (ameloblasts)

15. What are the mature cells for cementum?
Induction
Odontoclasts
The dental lamina
Cementocytes

16. What is tubercle?
Initiation
Common with permanent maxillary molars
Extra cusp due to effects on enamel organ
Common on permanent molars or cingulum of anterior teeth

17. What is the embryological background for dentin - cementum and alveolar bone?
The ectomesenchyme
Dental papilla
Cementocytes
Proliferation

18. What is the time span for the bud stage?
8th week
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dens in dente - gemination - tubercle - and fusion
Ameloblasts

19. What stage does anodontia occur?
Initiation stage
Differentiation
Maturation
Outer

20. Do odontoblasts start their secretion of matrix before the ameloblasts?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Abnormally small teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel

21. What are the formative cells for dentin?
Faulty development of enamel from interference involving ameloblasts
Odontoblasts
Differentiation - proliferation - morphogenesis
The tooth germ

22. What are the formative cells for alveolar bone?
8th week
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Union of 2 adjacent tooth germs
Osteoblasts

23. What happens during the bud 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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
May be confused as calculus deposit on root
The permanent molars

24. What are the mature cells for dentin?
Only dentinal tubules with processes
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
The cervical loop
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

25. What are the clinical ramifications of anodontia?
The permanent molars
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

26. What is the predominate process in the bell stage?
Cementocytes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary
Differentiation

27. What are the etiological factors for anodontia?
Sphere of enamel on root
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

28. Which teeth are nonsuccedaneous?
Outer
Common on permanent molars or cingulum of anterior teeth
Tooth germ
The permanent molars

29. What is another name for the dental sac?
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
Connective
Oral epithelium
Dental follicle

30. What are the etiological factors of enamel dysplasia?
Traumatic injury or crowding of teeth
Cementoblasts
The basement membrane that seperates the enamel organ and dental papilla
Local or systemic or hereditary

31. What are the incremental lines for enamel?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
May be confused as calculus deposit on root
The outer enamel epithelium
Lines of Retzuis

32. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
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
Enamel organ
The outer cells of the dental papilla and the central cells of the dental papilla
Development of one or more extra teeth

33. What is concrescence?
There are none - they are lost with eruption
Into odontoblasts
Enamel organ
Union of root structure of two or more teeth by cementum

34. What are the clinical ramifications of dens in dente?
Development of one or more extra teeth
9th to 10th weeks
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Only dentinal tubules with processes

35. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Apposition of the cementum
Bud stage
Cementoid

36. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dental tissues fully mineralize to their mature levels.
Odontoclasts
Odontoblastic process
A bilayer rim that consists only IEE and OEE

37. What hard tissue is innervated by nerves?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cuboidal cells
Dentin and alveolar bone
4 types

38. What are the cell layers found in the enamel organ in the bell stage?
Dental tissues fully mineralize to their mature levels.
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial
Cementoid

39. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
The primordium of the pulp
Displacement of ameloblasts to root surface
Absence of single or multiple teeth

40. Passive eruption
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Induction - proliferation
Enamel organ
When the gingiva recedes and no actual tooth movement takes place

41. What is the outer portion of the ectoderm in the initiation stage?
The bud stage
Oral epithelium
Hereditary
Morphogenesis

42. What processes are involved in the bell stage?
Local or systemic or hereditary
Differentiation - proliferation - morphogenesis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

43. What stage does the dental tissues subsequently fully mineralize
Induction
There is unequal growth in different parts of the tooth bud
Maturation
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

44. What stage does supernumerary teeth occur?
The actual vertical movement of the tooth
Morphogenesis
Differentiation
Initiation

45. What is matrix?
Tooth germ tries to divide
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

46. What do the odontoblasts do?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The basement membrane
8th week

47. What happens during the apposition stage?
Enamel organ
Initiation stage
Dental tissues secreted as matrix in successive layers.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

48. What is the function of the Hertwig's epithelial root sheath?
Odontoblastic process
The basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

49. Where is the dental sac originally derived from?
Hereditary
Imbrication lines of von Ebner
Differentiation - proliferation - morphogenesis
The ectomesenchyme

50. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
The outer enamel epithelium
Alveolar bone
Initiation stage