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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 is the enamel matrix secreted from by the ameloblasts?

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2. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
In the cap stage
The enamel - dentin - and cementum are secreted in successive layers
Initiation
Odontoclasts

3. When does the process of root development take place?
Maturation
Hereditary in localized form. endocrine dysfunction is complete
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ

4. What is the function of the Hertwig's epithelial root sheath?
9th to 10th weeks
The outer cells of the dental papilla and the central cells of the dental papilla
The ameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

5. What is amelogenisis?
6th to 7th weeks
Traumatic injury or crowding of teeth
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
The apposition of the enamel matrix

6. What is the cementum matrix called?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Traumatic injury or crowding of teeth
Oral epithelium
Cementoid

7. What hard tissue has vascularity?
9th to 10th weeks
Alveolar bone
The dental sac
Dentin and alveolar bone

8. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Traumatic injury or crowding of teeth
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
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The outer cells of the dental papilla and the central cells of the dental papilla

9. What are succedaneous teeth?
Faulty development of enamel from interference involving ameloblasts
The enamel organ - dental papilla - dental sac
Compressed layer of flat to cuboidal cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

10. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes
Union of root structure of two or more teeth by cementum

11. What are the formative cells for alveolar bone?
Union of 2 adjacent tooth germs
Osteoblasts
The enamel - dentin - and cementum are secreted in successive layers
The permanent molars

12. What stage does supernumerary teeth occur?
Initiation
In the cap stage
During the cap stage
As a result of the apposition of cementum over dentin

13. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Common on permanent molars or cingulum of anterior teeth
Tooth germ
A bilayer rim that consists only IEE and OEE

14. What else undergoes proliferation in the bud stage besides the dental lamina?
Dens in dente - gemination - tubercle - and fusion
The ectomesenchyme
Tooth germ tries to divide
Dentin and alveolar bone

15. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Inner
Extra cusp due to effects on enamel organ
Hereditary

16. What type of tissue is dentin - cementum - and alveolar bone?
Arrest and reversal lines
Connective
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
11th to 12th weeks

17. Where is the dental sac originally derived from?
The ectomesenchyme
Future dentin and pulp tissue
Common on permanent molars or cingulum of anterior teeth
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

18. What happens during the bell stage?
Preameloblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Union of 2 adjacent tooth germs
Cementocytes

19. What are the major components of the tooth germ?
Dentin secreting cells (odontoblats)
Abnormally small teeth
Initiation stage
The enamel organ - dental papilla - dental sac

20. What is an enamel pearl?
Sphere of enamel on root
Compressed layer of flat to cuboidal cells
Osteocytes
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

21. What are the mature cells for alveolar bone?
Dentin secreting cells (odontoblats)
Osteocytes
The bud stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

22. What is the cap in the cap stage?
The outer cells of the dental papilla and the central cells of the dental papilla
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.
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

23. How many types of cells are found in the enamel organ in the bell stage?
A bilayer rim that consists only IEE and OEE
4 types
Proliferation
Faulty development of enamel from interference involving ameloblasts

24. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel secreting cells (ameloblasts)
Dentin and alveolar bone

25. The stratum intermediate is located inner or outer?
Maturation
Inner
Enamel secreting cells (ameloblasts)
Dentin secreting cells (odontoblats)

26. What are the clinical ramifications of anodontia?
Dental tissues fully mineralize to their mature levels.
There are none - they are lost with eruption
Connective
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

27. What is the process involved in the maturation stage?
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

28. The stellate reticulum is located inner or outer?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The cementum - PDL - and alveolar bone
Outer
Commonly involves permanent maxillary lateral incisor and 3rd molars

29. What are the formative cells for cementum?
Epithelial rests of Malassez
6th to 7th weeks
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place

30. Which teeth are nonsuccedaneous?
There is unequal growth in different parts of the tooth bud
Only dentinal tubules with processes
The tooth germ
The permanent molars

31. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Common with permanent maxillary molars
Dental tissues fully mineralize to their mature levels.
The permanent molars

32. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Dentin secreting cells (odontoblats)
9th to 10th weeks
Local or systemic or hereditary
The ameloblasts place an acellular dental cuticle on the new enamel surface

33. What is macrodontia?
The ectomesenchyme
The basement membrane that seperates the enamel organ and dental papilla
Abnormally small teeth
Abnormally large teeth

34. Where is the dental papilla originally derived from?
Differentiation
The basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
6th to 7th weeks

35. What are the mature cells for cementum?
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
Cementocytes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental lamina

36. What are the etiological factors for fusion?
As a result of the apposition of cementum over dentin
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pressure on the area

37. What happens during initiation?
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
The ectomesenchyme
Initiation
Local or systemic or hereditary

38. What are the incremental lines for dentin?
Preameloblasts
There is unequal growth in different parts of the tooth bud
The ectoderm
Imbrication lines of von Ebner

39. What is the structure responsible for root development?
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 cervical loop
Cuboidal cells
Induction

40. 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.
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The actual vertical movement of the tooth
The enamel - dentin - and cementum are secreted in successive layers

41. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium
Tall columnar cells
Apposition of the cementum

42. What is gemination?
Future dentin and pulp tissue
Tooth germ tries to divide
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ

43. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Faulty development of enamel from interference involving ameloblasts
Epithelial rests of Malassez
Odontogenesis
May be confused as calculus deposit on root

44. What hard tissue is innervated by nerves?
There are none - they are lost with eruption
Dentin and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The permanent molars

45. What will the inner cells of the dental lamina differentiates into?
Enamel organ invaginates into the dental papilla
A mineralized cylinder - the dentinal tubule
The primordium of the pulp
Ameloblasts

46. What is dens in dente?
As a result of the apposition of cementum over dentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentin secreting cells (odontoblats)
Enamel organ invaginates into the dental papilla

47. What kind of cells occur in the outer enamel epithelium in the bell stage?
Future dentin and pulp tissue
Union of root structure of two or more teeth by cementum
Cuboidal cells
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 etiological factors for enamel pearl?
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.
Epithelial
The primordium of the pulp
Displacement of ameloblasts to root surface

49. What are the clinical ramifications of micro/macrodontia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Epithelial rests of Malassez
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth

50. What are the etiological factors for dens in dente and gemination?
Local or systemic or hereditary
Enamel organ invaginates into the dental papilla
Hereditary
The permanent molars