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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. Where does the primordium of the permanent dentition develop?
Induction - proliferation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Apposition of the cementum
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

2. 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
Outer
Dental follicle
Lines of Retzuis

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

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4. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Common with permanent maxillary molars
Traumatic injury or crowding of teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
Commonly involves permanent maxillary lateral incisor and 3rd molars

5. What are the processes involved in the cap stage?
Odontogenesis
Dental papilla
Cementocytes
Proliferation - differentiation - morphogenesis

6. What kind of cells occur in the outer enamel epithelium in the bell stage?
Epithelial
Preameloblasts
Cuboidal cells
6th to 7th weeks

7. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Hereditary
Dental tissues secreted as matrix in successive layers.
Epithelial

8. What is anodontia?
Imbrication lines of von Ebner
Absence of single or multiple teeth
Osteoblasts
The dental lamina

9. What are the mature cells for cementum?
Union of 2 adjacent tooth germs
Hereditary
Abnormally small teeth
Cementocytes

10. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel secreting cells (ameloblasts)
Only dentinal tubules with processes
4 types

11. What is the time span for the bud stage?
Bud stage
Tall columnar cells
Cementoid
8th week

12. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Abnormally small teeth
As a result of the apposition of cementum over dentin
It disintegrates as the developing oral mucosa comes to line the oral cavity
Osteoblasts

13. When does the process of root development take place?
The ameloblasts place an acellular dental cuticle on the new enamel surface
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Differentiation
Compressed layer of flat to cuboidal cells

14. What are the etiological factors for micro/macrodontia?
Absence of single or multiple teeth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally small teeth
Hereditary in localized form. endocrine dysfunction is complete

15. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
Differentiation - proliferation - morphogenesis
The ectomesenchyme - which was influenced by the neural crest cells
Pressure on the area

16. The stratum intermediate is located inner or outer?
Inner
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
Osteocytes
Oral epithelium

17. What are the incremental lines for enamel?
There are none - they are lost with eruption
Lines of Retzuis
The basement membrane that seperates the enamel organ and dental papilla
Cuboidal cells

18. What are the etiological factors of tubercle?
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
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
Alveolar bone
Trauma - pressure or metabolic disease

19. What are entrapped cementoblasts called?
Hereditary
Cementocytes
Cementoblasts
Inner

20. What happens during the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Initiation
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete

21. How many types of cells are found in the enamel organ in the bell stage?
4 types
Apposition of the cementum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Traumatic injury or crowding of teeth

22. What will the dental papilla eventually form?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Future dentin and pulp tissue
Into odontoblasts
Only dentinal tubules with processes

23. What will the outer cells of the dental lamina differentiate into?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Compressed layer of flat to cuboidal cells
The actual vertical movement of the tooth
Dentin secreting cells (odontoblats)

24. What is amelogenisis?
The primordium of the pulp
A mineralized cylinder - the dentinal tubule
The apposition of the enamel matrix
Odontoblasts

25. Where is the dental papilla originally derived from?
Preameloblasts
Dental follicle
Into odontoblasts
The ectomesenchyme - which was influenced by the neural crest cells

26. What are the formative cells for enamel?
8th week
Ameloblasts
The ectoderm
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

27. What is fusion?
Dental tissues fully mineralize to their mature levels.
Union of 2 adjacent tooth germs
Trauma - pressure or metabolic disease
9th to 10th weeks

28. 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.
Maturation
Hereditary
During the cap stage

29. How is the reduced enamel epithelium created?
Local or systemic or hereditary
The dental lamina
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ is compressed

30. What happens during the bud stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer cells of the dental papilla and the central cells of the dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Enamel organ invaginates into the dental papilla

31. What are supernumerary teeth?
Dental tissues secreted as matrix in successive layers.
Development of one or more extra teeth
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
As a result of the apposition of cementum over dentin

32. What are the major components of the tooth germ?
The dental sac
Dental papilla
The enamel organ - dental papilla - dental sac
Faulty development of enamel from interference involving ameloblasts

33. What are the etiological factors for fusion?
The stellate reticulum
The enamel - dentin - and cementum are secreted in successive layers
Pressure on the area
Oral epithelium

34. What is another name for the dental sac?
Inner
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental follicle
Maturation

35. What is microdontia?
The stellate reticulum
Abnormally small teeth
Dental tissues secreted as matrix in successive layers.
Future dentin and pulp tissue

36. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Into odontoblasts
The enamel organ - dental papilla - dental sac
The basement membrane

37. What are the formative cells for cementum?
The dental lamina
Cementoblasts
Enamel secreting cells (ameloblasts)
Union of root structure of two or more teeth by cementum

38. What are the clinical ramifications?
Hereditary
Common on permanent molars or cingulum of anterior teeth
Tall columnar cells
Dentin secreting cells (odontoblats)

39. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The bud stage
Connective
Outer

40. What will the inner cells of the dental lamina differentiates into?
Odontoblasts
Induction - proliferation
The primordium of the pulp
Ameloblasts

41. What is concrescence?
The ameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Union of root structure of two or more teeth by cementum
As a result of the apposition of cementum over dentin

42. What is the embryological background for dentin - cementum and alveolar bone?
The enamel organ - dental papilla - dental sac
Enamel pearl - enamel dysplasia - and concresence
Cementoblasts
Dental papilla

43. When does dens in dente occur?
During the cap stage
Dental papilla
Apposition of the cementum
Into odontoblasts

44. What is dens in dente?
Development of one or more extra teeth
Initiation
Enamel organ invaginates into the dental papilla
Epithelial

45. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tall columnar cells

46. What hard tissue is innervated by nerves?
Dentin and alveolar bone
Initiation stage
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ameloblasts

47. Tooth development
Odontogenesis
Abnormally large teeth
A mineralized cylinder - the dentinal tubule
Dental papilla

48. What is the function of the Hertwig's epithelial root sheath?
As a result of the apposition of cementum over dentin
The ectomesenchyme
Tooth germ tries to divide
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

49. What else undergoes proliferation in the bud stage besides the dental lamina?
Into odontoblasts
Initiation stage
Dentin and alveolar bone
The ectomesenchyme

50. What are the mature cells for dentin?
Initiation
Only dentinal tubules with processes
Development of one or more extra teeth
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.