Test your basic knowledge |

Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Odontoblastic process
Hereditary in localized form. endocrine dysfunction is complete
Ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

2. What is the cap in the cap stage?
Apposition of the cementum
The enamel organ
The enamel organ is compressed
Inner

3. What are the etiological factors for enamel pearl?
Odontoclasts
Arrest and reversal lines
Maturation
Displacement of ameloblasts to root surface

4. What are succedaneous teeth?
Induction - proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Maturation
Hereditary

5. What will the dental papilla eventually form?
Future dentin and pulp tissue
Lines of Retzuis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Differentiation - proliferation - morphogenesis

6. What will the inner cells of the dental lamina differentiates into?
Cementoblasts
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.
The primordium of the pulp
Absence of single or multiple teeth

7. What are the etiological factors of concrescence?
The tooth germ
Union of 2 adjacent tooth germs
Traumatic injury or crowding of teeth
Proliferation

8. What does the cervical loop consist of?
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
Hereditary
A bilayer rim that consists only IEE and OEE
Common on permanent molars or cingulum of anterior teeth

9. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
During the cap stage
Dental tissues secreted as matrix in successive layers.
The stellate reticulum

10. What is the main process involved in the bud stage?
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
Cementoid
Proliferation
The dental lamina

11. What is the structure responsible for root development?
4 types
The cervical loop
In the cap stage
Maturation

12. How is the dentinocemental junction formed?
The actual vertical movement of the tooth
As a result of the apposition of cementum over dentin
Arrest and reversal lines
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

13. What happens during the apposition stage?
9th to 10th weeks
Induction
Dental tissues secreted as matrix in successive layers.
The ectoderm

14. What are the clinical ramifications of supernumerary teeth?
There is unequal growth in different parts of the tooth bud
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Extra cusp due to effects on enamel organ
Osteoblasts

15. Do odontoblasts start their secretion of matrix before the ameloblasts?
A mineralized cylinder - the dentinal tubule
Development of one or more extra teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

16. What type of tissue is enamel?
Trauma - pressure or metabolic disease
Epithelial
Displacement of ameloblasts to root surface
Abnormally large teeth

17. What are the processes involved in 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.
Hereditary
Proliferation - differentiation - morphogenesis
Morphogenesis

18. What is the embryological background for enamel?
Enamel organ
Commonly involves permanent maxillary lateral incisor and 3rd molars
The cementum - PDL - and alveolar bone
In the cap stage

19. Active eruption
The actual vertical movement of the tooth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Inner
The cementum - PDL - and alveolar bone

20. Which layer in the bell stage has star shaped cells?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The stellate reticulum
Morphogenesis
Cementocytes

21. What is concrescence?
Preameloblasts
Union of root structure of two or more teeth by cementum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel organ invaginates into the dental papilla

22. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Inner
The bud stage
The basement membrane
Initiation stage

23. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Induction
Epithelial rests of Malassez
6th to 7th weeks
Hereditary

24. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
When the gingiva recedes and no actual tooth movement takes place
Initiation
Inner

25. What are the mature cells for alveolar bone?
The cementum - PDL - and alveolar bone
The enamel organ is compressed
The dental sac
Osteocytes

26. Tooth development
The ectomesenchyme
Odontogenesis
The tooth germ
Dentin and alveolar bone

27. What processes are involved in the bell stage?
Sphere of enamel on root
11th to 12th weeks
Differentiation - proliferation - morphogenesis
The basement membrane

28. What will the dental sac give rise to?
Abnormally small teeth
Union of 2 adjacent tooth germs
The cementum - PDL - and alveolar bone
8th week

29. What is the time span for the bud stage?
Dental tissues fully mineralize to their mature levels.
8th week
The ectomesenchyme
As a result of the apposition of cementum over dentin

30. What will the outer cells of the dental lamina differentiate into?
The tooth germ
Lines of Retzuis
Dentin secreting cells (odontoblats)
Bud stage

31. What are the incremental lines for cementum and alveolar bone?
The ectomesenchyme
Arrest and reversal lines
Epithelial
It disintegrates as the developing oral mucosa comes to line the oral cavity

32. What stage does supernumerary teeth occur?
Initiation
Enamel secreting cells (ameloblasts)
Proliferation - differentiation - morphogenesis
Alveolar bone

33. What are the etiological factors for dens in dente and gemination?
Connective
Hereditary
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
Odontoblasts

34. What happens during the cap stage?
The apposition of the enamel matrix
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.
Traumatic injury or crowding of teeth
Preameloblasts

35. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues secreted as matrix in successive layers.
The basement membrane that seperates the enamel organ and dental papilla

36. What are supernumerary teeth?
During the cap stage
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 basement membrane
Development of one or more extra teeth

37. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The actual vertical movement of the tooth
Cementoblasts
The enamel - dentin - and cementum are secreted in successive layers
Odontoblastic process

38. What are the clinical ramifications of dens in dente?
May be confused as calculus deposit on root
Morphogenesis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial rests of Malassez

39. What is the process involved in the maturation stage?
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
Maturation
During the cap stage
Local or systemic or hereditary

40. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Cementoblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoclasts
Pressure on the area

41. Where does the primordium of the permanent dentition develop?
In the cap stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The enamel organ - dental papilla - dental sac
Trauma - pressure or metabolic disease

42. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Pressure on the area
Enamel organ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

43. What kind of cells reside in the stratum intermediate?
Displacement of ameloblasts to root surface
Osteoblasts
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
Compressed layer of flat to cuboidal cells

44. What are the 2 layers in the dental papilla within the concavity of 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.
As a result of the apposition of cementum over dentin
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla

45. What happens during the maturation stage?
8th week
Faulty development of enamel from interference involving ameloblasts
Lines of Retzuis
Dental tissues fully mineralize to their mature levels.

46. What are the mature cells for enamel?
There are none - they are lost with eruption
Ameloblasts
Oral epithelium
The enamel organ - dental papilla - dental sac

47. What is the cementum matrix called?
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
Cementoid
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Maturation

48. What happens during the bud stage?
Cementoblasts
The cementum - PDL - and alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation

49. The stellate reticulum is located inner or outer?
The enamel organ
Tooth germ tries to divide
Outer
A mineralized cylinder - the dentinal tubule

50. What is the main process involved in initiation?
Development of one or more extra teeth
Abnormally small teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Induction