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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. Where is the dental papilla originally derived from?
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 large teeth
The ectomesenchyme - which was influenced by the neural crest cells
Future dentin and pulp tissue

2. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Inner
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Outer

3. What is gemination?
Dens in dente - gemination - tubercle - and fusion
Sphere of enamel on root
The ectomesenchyme - which was influenced by the neural crest cells
Tooth germ tries to divide

4. What is the main process involved in the bud stage?
Hereditary in localized form. endocrine dysfunction is complete
Dentin and alveolar bone
Proliferation
9th to 10th weeks

5. What is microdontia?
Dental papilla
Compressed layer of flat to cuboidal cells
Abnormally small teeth
Arrest and reversal lines

6. 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
The enamel organ - dental papilla - dental sac
The bud stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

7. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Maturation
It disintegrates as the developing oral mucosa comes to line the oral cavity
8th week

8. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Preameloblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Odontoblastic process
Extra cusp due to effects on enamel organ

9. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The enamel organ is compressed
The bud stage
Absence of single or multiple teeth
When the gingiva recedes and no actual tooth movement takes place

10. What hard tissue is innervated by nerves?
Pressure on the area
Hereditary
The dental sac
Dentin and alveolar bone

11. What will the outer cells of the dental lamina differentiate into?
The ectomesenchyme - which was influenced by the neural crest cells
Epithelial
Dentin secreting cells (odontoblats)
Initiation

12. Do odontoblasts start their secretion of matrix before the ameloblasts?
Imbrication lines of von Ebner
Osteocytes
A mineralized cylinder - the dentinal tubule
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

13. What are the development disturbances of the apposition and maturation stages?
Abnormally large teeth
Enamel pearl - enamel dysplasia - and concresence
Oral epithelium
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.

14. What is fusion?
Union of 2 adjacent tooth germs
Induction - proliferation
The basement membrane
The permanent molars

15. What are the etiological factors for supernumerary teeth?
Hereditary
The enamel organ - dental papilla - dental sac
Epithelial
Differentiation

16. What is matrix?
Dental follicle
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars

17. What is the embryological background for enamel?
Displacement of ameloblasts to root surface
Outer
Enamel organ
Traumatic injury or crowding of teeth

18. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
The tooth germ
The enamel organ
Into odontoblasts

19. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
The ectoderm
Epithelial rests of Malassez
Arrest and reversal lines

20. What are the etiological factors of enamel dysplasia?
Maturation
Local or systemic or hereditary
Induction - proliferation
Differentiation - proliferation - morphogenesis

21. What happens when the reduced enamel epithelium is created?
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
During the cap stage
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root

22. What is the primordium of the tooth?
Osteocytes
The tooth germ
11th to 12th weeks
Cementocytes

23. What is tubercle?
Extra cusp due to effects on enamel organ
The enamel organ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
When the gingiva recedes and no actual tooth movement takes place

24. What are succedaneous teeth?
Apposition of the cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel secreting cells (ameloblasts)
Cementocytes

25. What is macrodontia?
Ameloblasts
Sphere of enamel on root
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Abnormally large teeth

26. What processes are involved in the bell stage?
When the gingiva recedes and no actual tooth movement takes place
Differentiation - proliferation - morphogenesis
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
Traumatic injury or crowding of teeth

27. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Traumatic injury or crowding of teeth
Morphogenesis
Epithelial

28. 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
Cementoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cuboidal cells

29. What will the inner cells of the dental lamina differentiates into?
Epithelial rests of Malassez
There is unequal growth in different parts of the tooth bud
Dental papilla
The primordium of the pulp

30. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Dental papilla
Preameloblasts
Odontoblasts
The dental lamina

31. Active eruption
The enamel organ
Oral epithelium
The actual vertical movement of the tooth
Osteoblasts

32. What are the etiological factors for anodontia?
Epithelial
Faulty development of enamel from interference involving ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontogenesis

33. What are the clinical ramifications?
The basement membrane
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
Odontoclasts
Common on permanent molars or cingulum of anterior teeth

34. What hard tissue has vascularity?
When the gingiva recedes and no actual tooth movement takes place
Enamel secreting cells (ameloblasts)
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Alveolar bone

35. What is another name for the dental sac?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
6th to 7th weeks
Dental follicle
Enamel secreting cells (ameloblasts)

36. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Cuboidal cells
Hereditary
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

37. What are the incremental lines for enamel?
Abnormally small teeth
Lines of Retzuis
8th week
Arrest and reversal lines

38. What are the etiological factors for enamel pearl?
Absence of single or multiple teeth
Displacement of ameloblasts to root surface
Apposition of the cementum
Inner

39. Passive eruption
9th to 10th weeks
Bud stage
When the gingiva recedes and no actual tooth movement takes place
The basement membrane

40. What are the clinical ramifications of micro/macrodontia?
Dental follicle
Induction - proliferation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla

41. When does macro/microdontia occur?
The enamel organ
Sphere of enamel on root
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Bud stage

42. What is the structure responsible for root development?
Only dentinal tubules with processes
The actual vertical movement of the tooth
The cervical loop
6th to 7th weeks

43. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Maturation
4 types
The apposition of the enamel matrix

44. What will the dental papilla eventually form?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
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.
Future dentin and pulp tissue
Proliferation - differentiation - morphogenesis

45. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Local or systemic or hereditary
Common with permanent maxillary molars

46. What is the process involved in the maturation stage?
Oral epithelium
Maturation
Dental papilla
Cementoid

47. What are the major components of the tooth germ?
Enamel pearl - enamel dysplasia - and concresence
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The bud stage
The enamel organ - dental papilla - dental sac

48. What will the dental sac give rise to?
Cementoid
Absence of single or multiple teeth
The cementum - PDL - and alveolar bone
The ectoderm

49. What are the etiological factors for dens in dente and gemination?
Abnormally small teeth
Compressed layer of flat to cuboidal cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary

50. Where does the primordium of the permanent dentition develop?
The actual vertical movement of the tooth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Proliferation
Enamel organ