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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 is anodontia?
Odontoclasts
Ameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Absence of single or multiple teeth

2. What are the mature cells for dentin?
Tooth germ tries to divide
Only dentinal tubules with processes
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary

3. What is the predominate process in the bell stage?
Odontogenesis
Differentiation
Enamel organ invaginates into the dental papilla
The basement membrane

4. What will the dental papilla eventually form?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Connective
Future dentin and pulp tissue
Osteoblasts

5. What is concrescence?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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
Union of root structure of two or more teeth by cementum

6. What are succedaneous teeth?
Local or systemic or hereditary
Maturation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ameloblasts

7. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
In the cap stage
Dens in dente - gemination - tubercle - and fusion
During the cap stage

8. What are the etiological factors for micro/macrodontia?
In the cap stage
Hereditary in localized form. endocrine dysfunction is complete
Enamel secreting cells (ameloblasts)
The ameloblasts place an acellular dental cuticle on the new enamel surface

9. What are the mature cells for alveolar bone?
Alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Osteocytes
In the cap stage

10. Where is the enamal organ originally derived from?
Inner
Enamel organ
The ectoderm
Dental tissues fully mineralize to their mature levels.

11. What is dens in dente?
Imbrication lines of von Ebner
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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

12. What processes are involved in the bell stage?
Cementocytes
Dens in dente - gemination - tubercle - and fusion
Differentiation - proliferation - morphogenesis
Initiation

13. Tooth development
Odontogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The primordium of the pulp
Cementoblasts

14. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The ectomesenchyme - which was influenced by the neural crest cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Alveolar bone

15. The stratum intermediate is located inner or outer?
Only dentinal tubules with processes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Inner

16. The preameloblasts induce dental papilla cells to differentiate into what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Into odontoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

17. What are the formative cells for cementum?
Ameloblasts
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.
Cementoblasts
Induction - proliferation

18. What are the etiological factors for dens in dente and gemination?
Preameloblasts
Hereditary
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
Common on permanent molars or cingulum of anterior teeth

19. Active eruption
The actual vertical movement of the tooth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ is compressed
The outer cells of the dental papilla and the central cells of the dental papilla

20. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
There is unequal growth in different parts of the tooth bud
Enamel organ invaginates into the dental papilla
The bud stage
Compressed layer of flat to cuboidal cells

21. What else undergoes proliferation in the bud stage besides the dental lamina?
The apposition of the enamel matrix
Common with permanent maxillary molars
The ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

22. What is enamel dysplasia?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Faulty development of enamel from interference involving ameloblasts
The dental sac
The enamel - dentin - and cementum are secreted in successive layers

23. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
A bilayer rim that consists only IEE and OEE
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
Dental tissues secreted as matrix in successive layers.

24. What are supernumerary teeth?
Development of one or more extra teeth
Dental tissues fully mineralize to their mature levels.
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
As a result of the apposition of cementum over dentin

25. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Dens in dente - gemination - tubercle - and fusion
The bud stage
Faulty development of enamel from interference involving ameloblasts
The ameloblasts

26. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The ectomesenchyme - which was influenced by the neural crest cells
The primordium of the pulp
Odontoclasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

27. How is the reduced enamel epithelium created?
Cementoid
Compressed layer of flat to cuboidal cells
The enamel organ is compressed
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

28. What are the formative cells for alveolar bone?
Osteocytes
Displacement of ameloblasts to root surface
The ectomesenchyme - which was influenced by the neural crest cells
Osteoblasts

29. What are the incremental lines for cementum and alveolar bone?
Compressed layer of flat to cuboidal cells
A bilayer rim that consists only IEE and OEE
When the gingiva recedes and no actual tooth movement takes place
Arrest and reversal lines

30. What happens during the apposition stage?
The apposition of the enamel matrix
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental tissues secreted as matrix in successive layers.
When the gingiva recedes and no actual tooth movement takes place

31. Which teeth are nonsuccedaneous?
The permanent molars
Enamel secreting cells (ameloblasts)
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Abnormally small teeth

32. What are entrapped cementoblasts called?
Cementocytes
Dens in dente - gemination - tubercle - and fusion
Enamel organ
Odontogenesis

33. What are the etiological factors for supernumerary teeth?
Hereditary
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 is compressed
Displacement of ameloblasts to root surface

34. What is the time span for initiation?
Cementoblasts
Induction
There are none - they are lost with eruption
6th to 7th weeks

35. What is the time span for the bell stage?
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoblasts
11th to 12th weeks
Common on permanent molars or cingulum of anterior teeth

36. What are the etiological factors for anodontia?
Odontoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Bud stage
Development of one or more extra teeth

37. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
May be confused as calculus deposit on root
Only dentinal tubules with processes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental papilla

38. When does macro/microdontia occur?
Common with permanent maxillary molars
The bud stage
Bud stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

39. What are the clinical ramifications of anodontia?
Union of root structure of two or more teeth by cementum
9th to 10th weeks
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The outer cells of the dental papilla and the central cells of the dental papilla

40. In the cap stage the tooth bud does not grow - what happens?
The ectoderm
There is unequal growth in different parts of the tooth bud
Apposition of the cementum
Odontoclasts

41. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Abnormally small teeth
Preameloblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Inner

42. What is amelogenisis?
Bud stage
A bilayer rim that consists only IEE and OEE
The permanent molars
The apposition of the enamel matrix

43. What is fusion?
8th week
The ectomesenchyme - which was influenced by the neural crest cells
Union of 2 adjacent tooth germs
Dental papilla

44. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The ectoderm
Cementoblasts
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
Commonly involves permanent maxillary lateral incisor and 3rd molars

45. What will the inner cells of the dental lamina differentiates into?
Osteocytes
The primordium of the pulp
Abnormally large teeth
A mineralized cylinder - the dentinal tubule

46. Where is the dental papilla originally derived from?
Future dentin and pulp tissue
Common on permanent molars or cingulum of anterior teeth
The ectomesenchyme - which was influenced by the neural crest cells
Sphere of enamel on root

47. How is the dentinocemental junction formed?
Dental papilla
Differentiation - proliferation - morphogenesis
As a result of the apposition of cementum over dentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

48. How many types of cells are found in the enamel organ in the bell stage?
Apposition of the cementum
Epithelial
4 types
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

49. Where does the primordium of the permanent dentition develop?
The primordium of the pulp
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Induction
The bud stage

50. What happens during the cap stage?
Inner
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.
Dental tissues fully mineralize to their mature levels.
Union of 2 adjacent tooth germs

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Dentistry Tooth Development And Eruption

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