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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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1. What are the formative cells for dentin?
Odontoblasts
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 dental sac
The ectoderm

2. What is the function of the Hertwig's epithelial root sheath?
Traumatic injury or crowding of teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The permanent molars
Apposition of the cementum

3. What is the embryological background for dentin - cementum and alveolar bone?
The actual vertical movement of the tooth
Dental papilla
Faulty development of enamel from interference involving ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells

4. What stage does supernumerary teeth occur?
Initiation
The stellate reticulum
Hereditary
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

5. Do odontoblasts start their secretion of matrix before the ameloblasts?
Tooth germ tries to divide
The ectomesenchyme - which was influenced by the neural crest cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

6. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The enamel organ is compressed
Cementoblasts
Dental papilla
Dental tissues secreted as matrix in successive layers.

7. What stage does anodontia occur?
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
Trauma - pressure or metabolic disease
The bud stage
Initiation stage

8. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
A bilayer rim that consists only IEE and OEE
Cementoid
Sphere of enamel on root

9. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Osteocytes
Imbrication lines of von Ebner
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

10. What is the time span for the bell stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentin secreting cells (odontoblats)
11th to 12th weeks

11. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The basement membrane that seperates the enamel organ and dental papilla
Preameloblasts
Cementocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

12. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Cementoblasts
Dentin and alveolar bone
Absence of single or multiple teeth

13. What is concrescence?
Abnormally small teeth
The outer enamel epithelium
Union of root structure of two or more teeth by cementum
11th to 12th weeks

14. What are the major components of the tooth germ?
Ameloblasts
The dental lamina
The enamel organ - dental papilla - dental sac
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

15. What are the clinical ramifications of gemination?

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16. What are the developmental disturbances of the cap stage?
The enamel - dentin - and cementum are secreted in successive layers
The ectomesenchyme - which was influenced by the neural crest cells
May be confused as calculus deposit on root
Dens in dente - gemination - tubercle - and fusion

17. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementocytes
Hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

18. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Tooth germ tries to divide
Common on permanent molars or cingulum of anterior teeth
Imbrication lines of von Ebner

19. The stratum intermediate is located inner or outer?
Cuboidal cells
Alveolar bone
A mineralized cylinder - the dentinal tubule
Inner

20. What happens during the cap stage?
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 ameloblasts
Connective
Bud stage

21. What is the time span for the bud stage?
Epithelial
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
8th week
Hereditary

22. What is the site for the future dentioenamel junction?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The basement membrane that seperates the enamel organ and dental papilla
During the cap stage
Induction - proliferation

23. What is the predominate process of the cap stage?
Morphogenesis
As a result of the apposition of cementum over dentin
Apposition of the cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

24. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Connective
Extra cusp due to effects on enamel organ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

25. Where is the enamal organ originally derived from?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ectoderm
Initiation stage
Future dentin and pulp tissue

26. What are the clinical ramifications of enamel dysplasia?
The outer enamel epithelium
Induction - proliferation
The stellate reticulum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

27. What is amelogenisis?
The ectomesenchyme
The dental sac
The apposition of the enamel matrix
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

28. What are the etiological factors for supernumerary teeth?
Hereditary
The basement membrane
Absence of single or multiple teeth
The enamel organ - dental papilla - dental sac

29. What is the cementum matrix called?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Morphogenesis
Cementoid
The enamel - dentin - and cementum are secreted in successive layers

30. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane that seperates the enamel organ and dental papilla
There is unequal growth in different parts of the tooth bud
May be confused as calculus deposit on root

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Differentiation - proliferation - morphogenesis
The ectomesenchyme - which was influenced by the neural crest cells
Displacement of ameloblasts to root surface

32. What hard tissue has vascularity?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental tissues fully mineralize to their mature levels.
The bud stage
Alveolar bone

33. What kind of cells occur in the inner enamel epithelium?
The dental sac
Dens in dente - gemination - tubercle - and fusion
Odontogenesis
Tall columnar cells

34. What is the predominate process in the bell stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Differentiation
The ectomesenchyme - which was influenced by the neural crest cells
The outer cells of the dental papilla and the central cells of the dental papilla

35. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Enamel organ
Odontoblastic process
Proliferation
Differentiation - proliferation - morphogenesis

36. What happens during the bud stage?
Differentiation - proliferation - morphogenesis
Outer
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Imbrication lines of von Ebner

37. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Cementoid
Cementoblasts
Odontoblasts

38. What is the primordium of the tooth?
Apposition of the cementum
The tooth germ
Local or systemic or hereditary
The ectoderm

39. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Local or systemic or hereditary
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

40. What is dens in dente?
Cuboidal cells
Enamel organ invaginates into the dental papilla
Preameloblasts
Hereditary in localized form. endocrine dysfunction is complete

41. What is microdontia?
The cervical loop
The ectomesenchyme - which was influenced by the neural crest cells
Abnormally small teeth
Cuboidal cells

42. What are the mature cells for dentin?
Tall columnar cells
The enamel organ
Future dentin and pulp tissue
Only dentinal tubules with processes

43. What are the mature cells for enamel?
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
There are none - they are lost with eruption
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary in localized form. endocrine dysfunction is complete

44. What happens during initiation?
Epithelial rests of Malassez
Cementocytes
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 ectomesenchyme - which was influenced by the neural crest cells

45. What do the odontoblasts do?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Compressed layer of flat to cuboidal cells
Odontogenesis

46. In the cap stage the tooth bud does not grow - what happens?
The tooth germ
There is unequal growth in different parts of the tooth bud
Maturation
Sphere of enamel on root

47. What is anodontia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The stellate reticulum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Absence of single or multiple teeth

48. The oral epithelium is induced by the ectomesenchyme to produce what?
Epithelial rests of Malassez
The permanent molars
The dental lamina
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

49. What will the inner cells of the dental lamina differentiates into?
Union of 2 adjacent tooth germs
8th week
As a result of the apposition of cementum over dentin
The primordium of the pulp

50. What are the etiological factors for fusion?
Tooth germ
Cementoblasts
May be confused as calculus deposit on root
Pressure on the area