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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 will the dental sac give rise to?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The permanent molars
Absence of single or multiple teeth
The cementum - PDL - and alveolar bone

2. What happens during the bell stage?
Hereditary
Cementoid
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Maturation

3. What are the etiological factors for supernumerary teeth?
The enamel - dentin - and cementum are secreted in successive layers
Hereditary
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Initiation

4. Tooth development
Initiation stage
Odontogenesis
The ectomesenchyme
Abnormally large teeth

5. What are the etiological factors for micro/macrodontia?
Preameloblasts
Hereditary in localized form. endocrine dysfunction is complete
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Epithelial rests of Malassez

6. What are the etiological factors for anodontia?
Differentiation
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
Preameloblasts

7. What is the site for the future dentioenamel junction?
Connective
The basement membrane that seperates the enamel organ and dental papilla
Common with permanent maxillary molars
It disintegrates as the developing oral mucosa comes to line the oral cavity

8. What are the etiological factors of enamel dysplasia?
Dental papilla
Local or systemic or hereditary
Tooth germ tries to divide
As a result of the apposition of cementum over dentin

9. What are the etiological factors for enamel pearl?
Cementocytes
Displacement of ameloblasts to root surface
Osteocytes
Proliferation - differentiation - morphogenesis

10. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Abnormally large teeth
Odontoclasts
In the cap stage

11. What is the cap in the cap stage?
Faulty development of enamel from interference involving ameloblasts
Preameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ

12. Which layer in the bell stage has star shaped cells?
Inner
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The stellate reticulum
Future dentin and pulp tissue

13. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Absence of single or multiple teeth
Odontoclasts
Maturation
Odontoblastic process

14. What is the process involved in the maturation stage?
Maturation
4 types
Inner
May be confused as calculus deposit on root

15. What is gemination?
Tooth germ tries to divide
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.
Abnormally small teeth
Development of one or more extra teeth

16. What are the clinical ramifications of micro/macrodontia?
Union of 2 adjacent tooth germs
Commonly involves permanent maxillary lateral incisor and 3rd molars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
A mineralized cylinder - the dentinal tubule

17. What are the etiological factors for fusion?
Pressure on the area
Faulty development of enamel from interference involving ameloblasts
Enamel
Proliferation

18. What kind of cells occur in the outer enamel epithelium in the bell stage?
The enamel organ - dental papilla - dental sac
6th to 7th weeks
Cuboidal cells
Outer

19. What are the clinical ramifications of gemination?

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20. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Odontoblastic process
The tooth germ
Cementoid

21. What are the processes involved in the cap stage?
Absence of single or multiple teeth
Proliferation - differentiation - morphogenesis
Pressure on the area
Into odontoblasts

22. What are supernumerary teeth?
Maturation
The primordium of the pulp
Development of one or more extra teeth
Alveolar bone

23. How is the reduced enamel epithelium created?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Odontogenesis
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ is compressed

24. What are the formative cells for enamel?
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Ameloblasts
Into odontoblasts

25. What happens during the cap stage?
Dental tissues secreted as matrix in successive layers.
The enamel organ
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.
Dentin and alveolar bone

26. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Proliferation - differentiation - morphogenesis
The permanent molars
There are none - they are lost with eruption

27. What hard tissue is innervated by nerves?
Epithelial
Odontoblasts
Dentin and alveolar bone
Enamel organ

28. What are the mature cells for alveolar bone?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Future dentin and pulp tissue
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Osteocytes

29. The stratum intermediate is located inner or outer?
Induction
Inner
Cementocytes
Dental follicle

30. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Cementocytes
Abnormally small teeth
Future dentin and pulp tissue

31. What wll the inner enamel epithelium differentiate into?
Dens in dente - gemination - tubercle - and fusion
Enamel secreting cells (ameloblasts)
Cementoblasts
Maturation

32. 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
Union of 2 adjacent tooth germs
Cementoid
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

33. What is the cementum matrix called?
6th to 7th weeks
Absence of single or multiple teeth
Cementoid
Common with permanent maxillary molars

34. What will the dental papilla eventually form?
Future dentin and pulp tissue
Cementocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

35. Which teeth are nonsuccedaneous?
Initiation stage
The basement membrane that seperates the enamel organ and dental papilla
The permanent molars
Proliferation - differentiation - morphogenesis

36. What is the embryological background for enamel?
Tooth germ tries to divide
Abnormally small teeth
Epithelial rests of Malassez
Enamel organ

37. What kind of cells reside in the stratum intermediate?
Hereditary in localized form. endocrine dysfunction is complete
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Initiation stage
Compressed layer of flat to cuboidal cells

38. What are entrapped cementoblasts called?
Imbrication lines of von Ebner
Cementocytes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

39. What is anodontia?
Absence of single or multiple teeth
Abnormally small teeth
Oral epithelium
Cementoid

40. What is an enamel pearl?
Sphere of enamel on root
Differentiation
Future dentin and pulp tissue
Trauma - pressure or metabolic disease

41. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
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

42. What is the structure responsible for root development?
May be confused as calculus deposit on root
The cervical loop
Enamel organ invaginates into the dental papilla
Dentin secreting cells (odontoblats)

43. What are the clinical ramifications of concrescence?
Future dentin and pulp tissue
Cuboidal cells
Common with permanent maxillary molars
The outer cells of the dental papilla and the central cells of the dental papilla

44. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The outer enamel epithelium
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
It disintegrates as the developing oral mucosa comes to line the oral cavity
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

45. When does the tooth bud become a tooth germ?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Sphere of enamel on root
In the cap stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

46. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Traumatic injury or crowding of teeth
Cementoblasts
Dental tissues secreted as matrix in successive layers.
Dental papilla

47. What are the mature cells for cementum?
The enamel organ is compressed
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes
Development of one or more extra teeth

48. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Hereditary
Union of 2 adjacent tooth germs
Local or systemic or hereditary

49. Active eruption
Tooth germ tries to divide
The actual vertical movement of the tooth
Cuboidal cells
Proliferation

50. What type of tissue is enamel?
The ameloblasts
Epithelial
Cuboidal cells
Trauma - pressure or metabolic disease