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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 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
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There are none - they are lost with eruption
Alveolar bone

2. The preameloblasts induce dental papilla cells to differentiate into what?
Epithelial
The dental sac
Inner
Into odontoblasts

3. What processes are involved with the apposition stage?
Induction - proliferation
Absence of single or multiple teeth
The basement membrane that seperates the enamel organ and dental papilla
Union of root structure of two or more teeth by cementum

4. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
May be confused as calculus deposit on root
Displacement of ameloblasts to root surface
Induction - proliferation

5. What stage does supernumerary teeth occur?
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
Initiation
When the gingiva recedes and no actual tooth movement takes place

6. What is the embryological background for enamel?
Preameloblasts
Dentin and alveolar bone
In the cap stage
Enamel organ

7. What are the clinical ramifications of gemination?

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8. What is concrescence?
Union of root structure of two or more teeth by cementum
The outer enamel epithelium
Abnormally large teeth
Differentiation

9. What are the incremental lines for dentin?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Commonly involves permanent maxillary lateral incisor and 3rd molars
Imbrication lines of von Ebner
The apposition of the enamel matrix

10. What does the cervical loop consist of?
The primordium of the pulp
A bilayer rim that consists only IEE and OEE
Dental tissues fully mineralize to their mature levels.
The basement membrane that seperates the enamel organ and dental papilla

11. What are the mature cells for alveolar bone?
Osteocytes
The bud stage
Common on permanent molars or cingulum of anterior teeth
The ectomesenchyme - which was influenced by the neural crest cells

12. What is matrix?
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
Connective
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel

13. What are entrapped cementoblasts called?
Cementocytes
Initiation
The primordium of the pulp
May be confused as calculus deposit on root

14. What are the etiological factors for dens in dente and gemination?
Morphogenesis
The permanent molars
Hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

15. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementocytes
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

16. What will the inner cells of the dental lamina differentiates into?
As a result of the apposition of cementum over dentin
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence

17. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Initiation
Arrest and reversal lines
Initiation stage
The bud stage

18. What is gemination?
Apposition of the cementum
The enamel organ
Tooth germ tries to divide
Enamel secreting cells (ameloblasts)

19. What kind of cells occur in the outer enamel epithelium in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
Epithelial
Cuboidal cells
Enamel secreting cells (ameloblasts)

20. What else undergoes proliferation in the bud stage besides the dental lamina?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme
Compressed layer of flat to cuboidal cells

21. How many types of cells are found in the enamel organ in the bell stage?
Induction
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
There are none - they are lost with eruption
4 types

22. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Displacement of ameloblasts to root surface
It disintegrates as the developing oral mucosa comes to line the oral cavity
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dental tissues fully mineralize to their mature levels.

23. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
The basement membrane
Lines of Retzuis
Odontoclasts

24. What are the formative cells for cementum?
Extra cusp due to effects on enamel organ
Cementoblasts
As a result of the apposition of cementum over dentin
The enamel organ - dental papilla - dental sac

25. The oral epithelium is induced by the ectomesenchyme to produce what?
Enamel
Enamel secreting cells (ameloblasts)
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The dental lamina

26. What are the etiological factors of concrescence?
Commonly involves permanent maxillary lateral incisor and 3rd molars
The enamel organ
8th week
Traumatic injury or crowding of teeth

27. What is the time span for the bell stage?
Proliferation - differentiation - morphogenesis
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
11th to 12th weeks
During the cap stage

28. What are the clinical ramifications of fusion?
Lines of Retzuis
Connective
Union of 2 adjacent tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

29. 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
A bilayer rim that consists only IEE and OEE
Bud stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

30. What are the incremental lines for cementum and alveolar bone?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Faulty development of enamel from interference involving ameloblasts
Arrest and reversal lines
Odontoclasts

31. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Dental papilla
The basement membrane
Union of 2 adjacent tooth germs
Bud stage

32. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer cells of the dental papilla and the central cells of the dental papilla
Into odontoblasts
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

33. How is the dentinocemental junction formed?
The enamel organ is compressed
As a result of the apposition of cementum over dentin
Proliferation
Absence of single or multiple teeth

34. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Tall columnar cells
Dental papilla
Tooth germ
The outer enamel epithelium

35. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Tooth germ
Dentin secreting cells (odontoblats)
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

36. What hard tissue has vascularity?
Alveolar bone
The basement membrane that seperates the enamel organ and dental papilla
Initiation stage
Apposition of the cementum

37. Which teeth are nonsuccedaneous?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental papilla
Compressed layer of flat to cuboidal cells
The permanent molars

38. What is the site for the future dentioenamel junction?
Maturation
A bilayer rim that consists only IEE and OEE
Osteoblasts
The basement membrane that seperates the enamel organ and dental papilla

39. What do the odontoblasts do?
Tooth germ
Ameloblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel organ

40. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
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
Dental papilla
The basement membrane
The cervical loop

41. What stage does the dental tissues subsequently fully mineralize
Induction - proliferation
Maturation
The ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

42. What kind of cells occur in the inner enamel epithelium?
Proliferation
Epithelial
Tall columnar cells
Only dentinal tubules with processes

43. What is the function of the Hertwig's epithelial root sheath?
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
Preameloblasts
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.
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

44. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tooth germ
Into odontoblasts
Enamel organ

45. What hard tissue is can not have tissue formation after eruption?
Enamel
Connective
Local or systemic or hereditary
The tooth germ

46. What are the etiological factors of enamel dysplasia?
4 types
The outer enamel epithelium
Local or systemic or hereditary
Proliferation - differentiation - morphogenesis

47. What is the structure responsible for root development?
The cervical loop
Odontoblastic process
Cementoblasts
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

48. What are the clinical ramifications?
The apposition of the enamel matrix
Abnormally large teeth
Common on permanent molars or cingulum of anterior teeth
The cementum - PDL - and alveolar bone

49. When does macro/microdontia occur?
Bud stage
The apposition of the enamel matrix
Induction - proliferation
Hereditary

50. What are the incremental lines for enamel?
Lines of Retzuis
9th to 10th weeks
A mineralized cylinder - the dentinal tubule
Proliferation - differentiation - morphogenesis