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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 wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The tooth germ
Tall columnar cells
Dental papilla

2. Tooth development
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dentin and alveolar bone
Union of 2 adjacent tooth germs
Odontogenesis

3. What is cementogenisis?
As a result of the apposition of cementum over dentin
A mineralized cylinder - the dentinal tubule
The basement membrane
Apposition of the cementum

4. What are the etiological factors for micro/macrodontia?
Epithelial
The cervical loop
Hereditary in localized form. endocrine dysfunction is complete
Osteoblasts

5. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
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
Maturation
Development of one or more extra teeth

6. What stage does the dental tissues subsequently fully mineralize
Maturation
A mineralized cylinder - the dentinal tubule
There are none - they are lost with eruption
4 types

7. How is the reduced enamel epithelium created?
Hereditary
The basement membrane
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The enamel organ is compressed

8. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Induction - proliferation
Pressure on the area

9. What are the odontoblastic processes is contained in what?
Dental follicle
Trauma - pressure or metabolic disease
A mineralized cylinder - the dentinal tubule
Osteocytes

10. What is tubercle?
Extra cusp due to effects on enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementocytes

11. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Oral epithelium
It disintegrates as the developing oral mucosa comes to line the oral cavity
Ameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

12. What are the etiological factors for dens in dente and gemination?
Proliferation
Odontoclasts
Hereditary
The cementum - PDL - and alveolar bone

13. What is fusion?
The ectomesenchyme
Union of root structure of two or more teeth by cementum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Union of 2 adjacent tooth germs

14. What are succedaneous teeth?
Induction
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.
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The apposition of the enamel matrix

15. What are entrapped cementoblasts called?
Union of 2 adjacent tooth germs
Cementocytes
Compressed layer of flat to cuboidal cells
Proliferation - differentiation - morphogenesis

16. What is the structure responsible for root development?
Epithelial
Only dentinal tubules with processes
Ameloblasts
The cervical loop

17. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Dental papilla
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Common with permanent maxillary molars

18. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Imbrication lines of von Ebner
The enamel organ is compressed

19. What hard tissue has vascularity?
Alveolar bone
The ectoderm
The permanent molars
Induction

20. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Only dentinal tubules with processes
Local or systemic or hereditary
The cervical loop

21. What happens during the apposition stage?
Development of one or more extra teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues secreted as matrix in successive layers.
The outer cells of the dental papilla and the central cells of the dental papilla

22. What is the time span for the bud stage?
Osteoblasts
8th week
Dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla

23. What is another name for the dental sac?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental follicle
Imbrication lines of von Ebner
The actual vertical movement of the tooth

24. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Initiation stage
Common on permanent molars or cingulum of anterior teeth
Osteoblasts
Epithelial rests of Malassez

25. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
In the cap stage
A mineralized cylinder - the dentinal tubule
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

26. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Cementoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontoclasts

27. What happens during the maturation stage?
The dental lamina
Odontogenesis
The permanent molars
Dental tissues fully mineralize to their mature levels.

28. When does macro/microdontia occur?
Connective
Odontogenesis
Bud stage
The bud stage

29. What processes are involved in the bell stage?
The basement membrane
Osteocytes
Pressure on the area
Differentiation - proliferation - morphogenesis

30. What are the incremental lines for dentin?
Odontogenesis
The enamel - dentin - and cementum are secreted in successive layers
Imbrication lines of von Ebner
Induction

31. What is the main process involved in initiation?
Osteoblasts
Induction
9th to 10th weeks
Dental tissues fully mineralize to their mature levels.

32. What are the clinical ramifications of gemination?

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33. What is the embryological background for enamel?
Initiation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Enamel secreting cells (ameloblasts)
Enamel organ

34. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane
Dental papilla
Faulty development of enamel from interference involving ameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla

35. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
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
Dens in dente - gemination - tubercle - and fusion

36. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The cementum - PDL - and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity
Alveolar bone

37. When does the tooth bud become a tooth germ?
Differentiation
Initiation stage
Alveolar bone
In the cap stage

38. What is an enamel pearl?
The enamel organ
Sphere of enamel on root
Inner
Odontoclasts

39. What type of tissue is enamel?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Preameloblasts
Epithelial
Tall columnar cells

40. How many types of cells are found in the enamel organ in the bell stage?
Proliferation - differentiation - morphogenesis
4 types
The outer enamel epithelium
Enamel organ

41. What is enamel dysplasia?
Hereditary
Faulty development of enamel from interference involving ameloblasts
6th to 7th weeks
Traumatic injury or crowding of teeth

42. What are the mature cells for dentin?
Hereditary in localized form. endocrine dysfunction is complete
Only dentinal tubules with processes
Union of 2 adjacent tooth germs
Enamel

43. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The basement membrane
Dentin secreting cells (odontoblats)
Commonly involves permanent maxillary lateral incisor and 3rd molars

44. The preameloblasts induce dental papilla cells to differentiate into what?
Enamel pearl - enamel dysplasia - and concresence
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Into odontoblasts

45. What is gemination?
Tooth germ tries to divide
There is unequal growth in different parts of the tooth bud
Faulty development of enamel from interference involving ameloblasts
Induction

46. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel organ
Preameloblasts
Connective
Apposition of the cementum

47. Which layer in the bell stage has star shaped cells?
Absence of single or multiple teeth
The ectomesenchyme
The stellate reticulum
Initiation stage

48. What is the site for the future dentioenamel junction?
Cementoblasts
The basement membrane that seperates the enamel organ and dental papilla
Dentin and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers

49. What happens during the cap stage?
Trauma - pressure or metabolic disease
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.
Initiation stage
Future dentin and pulp tissue

50. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Connective
Odontoblastic process
The tooth germ
4 types