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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?
Faulty development of enamel from interference involving ameloblasts
Absence of single or multiple teeth
The ectoderm
Differentiation - proliferation - morphogenesis

2. What does the cervical loop consist of?
Dentin secreting cells (odontoblats)
Apposition of the cementum
Absence of single or multiple teeth
A bilayer rim that consists only IEE and OEE

3. What are the mature cells for cementum?
Extra cusp due to effects on enamel organ
Oral epithelium
Imbrication lines of von Ebner
Cementocytes

4. What is the predominate process in the bell stage?
Dens in dente - gemination - tubercle - and fusion
Development of one or more extra teeth
The ameloblasts
Differentiation

5. What are the odontoblastic processes is contained in what?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The primordium of the pulp
Enamel organ
A mineralized cylinder - the dentinal tubule

6. What are the clinical ramifications of concrescence?
Odontoblastic process
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Common with permanent maxillary molars
Alveolar bone

7. What are the etiological factors for micro/macrodontia?
The ectomesenchyme - which was influenced by the neural crest cells
Hereditary in localized form. endocrine dysfunction is complete
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

8. What is concrescence?
Oral epithelium
Alveolar bone
Cuboidal cells
Union of root structure of two or more teeth by cementum

9. What are entrapped cementoblasts called?
Cementocytes
6th to 7th weeks
Maturation
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

10. Where is the dental sac originally derived from?
The enamel organ - dental papilla - dental sac
Pressure on the area
The ectomesenchyme
The dental sac

11. What is the primordium of the tooth?
A mineralized cylinder - the dentinal tubule
The tooth germ
Cuboidal cells
The enamel organ is compressed

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

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13. What is the structure responsible for root development?
Oral epithelium
The apposition of the enamel matrix
The cervical loop
The ectoderm

14. What happens when the reduced enamel epithelium is created?
Abnormally small teeth
Epithelial
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
The ectomesenchyme

15. What is the process involved in the maturation stage?
8th week
The enamel organ
Maturation
The cementum - PDL - and alveolar bone

16. What is gemination?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental tissues secreted as matrix in successive layers.
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
Tooth germ tries to divide

17. What are the etiological factors for enamel pearl?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Displacement of ameloblasts to root surface
Enamel organ
Dental follicle

18. When does the process of root development take place?
The ectomesenchyme
Tall columnar cells
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The basement membrane

19. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The tooth germ
Absence of single or multiple teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

20. What is the time span for the cap stage?
Enamel secreting cells (ameloblasts)
9th to 10th weeks
Displacement of ameloblasts to root surface
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

21. What are the cell layers found in the enamel organ in the bell stage?
In the cap stage
The enamel organ - dental papilla - dental sac
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
4 types

22. Where does the primordium of the permanent dentition develop?
The bud stage
Compressed layer of flat to cuboidal cells
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
6th to 7th weeks

23. What is the main process involved in the bud stage?
The ameloblasts
Osteocytes
9th to 10th weeks
Proliferation

24. What are the clinical ramifications of dens in dente?
Proliferation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Tooth germ tries to divide
Lines of Retzuis

25. The preameloblasts induce dental papilla cells to differentiate into what?
Cementocytes
Displacement of ameloblasts to root surface
Abnormally small teeth
Into odontoblasts

26. What are the clinical ramifications of anodontia?
Epithelial
Enamel organ
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental papilla

27. The stellate reticulum is located inner or outer?
Enamel organ
Outer
Initiation
Abnormally large teeth

28. What is tubercle?
Maturation
Initiation
Extra cusp due to effects on enamel organ
The dental sac

29. What kind of cells reside in the stratum intermediate?
Only dentinal tubules with processes
Development of one or more extra teeth
Cementoblasts
Compressed layer of flat to cuboidal cells

30. What are the formative cells for alveolar bone?
The tooth germ
Osteoblasts
Cementoid
Lines of Retzuis

31. What are the etiological factors of enamel dysplasia?
Odontogenesis
The ectoderm
Local or systemic or hereditary
When the gingiva recedes and no actual tooth movement takes place

32. What stage does anodontia occur?
Initiation stage
Differentiation
Union of root structure of two or more teeth by cementum
Hereditary

33. What are the mature cells for enamel?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ
6th to 7th weeks
There are none - they are lost with eruption

34. When does macro/microdontia occur?
Cementocytes
Union of 2 adjacent tooth germs
Bud stage
The ectoderm

35. What are supernumerary teeth?
Ameloblasts
The primordium of the pulp
Tall columnar cells
Development of one or more extra teeth

36. Which layer in the bell stage has star shaped cells?
The primordium of the pulp
Pressure on the area
The stellate reticulum
Hereditary

37. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
In the cap stage
The dental sac
Hereditary in localized form. endocrine dysfunction is complete

38. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
A bilayer rim that consists only IEE and OEE
The ectomesenchyme - which was influenced by the neural crest cells
Tooth germ
Cementoblasts

39. Where is the enamal organ originally derived from?
Abnormally large teeth
Sphere of enamel on root
The ectoderm
4 types

40. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
The ectoderm
The ectomesenchyme - which was influenced by the neural crest cells
Epithelial rests of Malassez

41. What hard tissue is can not have tissue formation after eruption?
Cementoid
Enamel
Oral epithelium
Cementoblasts

42. What are the developmental disturbances of the cap stage?
Enamel
Only dentinal tubules with processes
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dens in dente - gemination - tubercle - and fusion

43. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Extra cusp due to effects on enamel organ
When the gingiva recedes and no actual tooth movement takes place
6th to 7th weeks

44. What are the formative cells for dentin?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoblasts
The dental sac
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

45. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The dental lamina
Faulty development of enamel from interference involving ameloblasts

46. What happens during the cap stage?
The dental sac
There is unequal growth in different parts of the tooth bud
Commonly involves permanent maxillary lateral incisor and 3rd molars
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.

47. What wll the inner enamel epithelium differentiate into?
In the cap stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Pressure on the area
Enamel secreting cells (ameloblasts)

48. What are the processes involved in the cap stage?
Maturation
Enamel
Enamel organ
Proliferation - differentiation - morphogenesis

49. What is enamel dysplasia?
Differentiation
Faulty development of enamel from interference involving ameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectoderm

50. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
11th to 12th weeks
The outer cells of the dental papilla and the central cells of the dental papilla