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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. What will the dental sac give rise to?
The dental sac
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The cementum - PDL - and alveolar bone
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

2. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
11th to 12th weeks
Union of 2 adjacent tooth germs
Cementoid
Odontoclasts

3. How is the reduced enamel epithelium created?
The enamel organ is compressed
Ameloblasts
8th week
The ameloblasts

4. Which layer in the bell stage has star shaped cells?
The permanent molars
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Cementoid
The stellate reticulum

5. What happens during initiation?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoblasts
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 cervical loop

6. What are the formative cells for cementum?
Odontoclasts
Cementoblasts
Dentin and alveolar bone
4 types

7. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Cementoid
Pressure on the area
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

8. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Differentiation - proliferation - morphogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The permanent molars

9. What are the incremental lines for dentin?
Displacement of ameloblasts to root surface
Common with permanent maxillary molars
Cementocytes
Imbrication lines of von Ebner

10. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The cementum - PDL - and alveolar bone
4 types
Differentiation
Dental papilla

11. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
The stellate reticulum
Abnormally small teeth
Osteoblasts

12. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The enamel organ - dental papilla - dental sac
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The basement membrane

13. What is the embryological background for dentin - cementum and alveolar bone?
The primordium of the pulp
Proliferation - differentiation - morphogenesis
Dental papilla
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

14. What hard tissue is innervated by nerves?
Local or systemic or hereditary
Dentin and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
Compressed layer of flat to cuboidal cells

15. What will the inner cells of the dental lamina differentiates into?
Epithelial rests of Malassez
The dental sac
The primordium of the pulp
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

16. What are the incremental lines for cementum and alveolar bone?
The ameloblasts
Union of root structure of two or more teeth by cementum
Arrest and reversal lines
Extra cusp due to effects on enamel organ

17. What is the predominate process of the cap stage?
Morphogenesis
In the cap stage
9th to 10th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

18. What type of tissue is dentin - cementum - and alveolar bone?
A mineralized cylinder - the dentinal tubule
Connective
Imbrication lines of von Ebner
Dental papilla

19. What is the function of the Hertwig's epithelial root sheath?
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
Lines of Retzuis
Initiation stage

20. What are the clinical ramifications of dens in dente?
Dens in dente - gemination - tubercle - and fusion
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
May be confused as calculus deposit on root
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

21. What happens during the cap stage?
The outer cells of the dental papilla and the central cells of the dental papilla
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.
4 types
Osteoblasts

22. What processes are involved with the apposition stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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
Dental papilla
Induction - proliferation

23. What are the formative cells for enamel?
11th to 12th weeks
The enamel organ is compressed
Commonly involves permanent maxillary lateral incisor and 3rd molars
Ameloblasts

24. What are the etiological factors for fusion?
Pressure on the area
Enamel pearl - enamel dysplasia - and concresence
Arrest and reversal lines
The permanent molars

25. When does the process of root development take place?
Tooth germ tries to divide
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Odontoblastic process

26. The stratum intermediate is located inner or outer?
Local or systemic or hereditary
May be confused as calculus deposit on root
Enamel secreting cells (ameloblasts)
Inner

27. What is cementogenisis?
Arrest and reversal lines
The basement membrane that seperates the enamel organ and dental papilla
Enamel organ invaginates into the dental papilla
Apposition of the cementum

28. What happens during the bell stage?
The basement membrane
Bud stage
Hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

29. What will the dental papilla eventually form?
Future dentin and pulp tissue
Dentin and alveolar bone
Hereditary
Development of one or more extra teeth

30. 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
Arrest and reversal lines
Abnormally small teeth
The dental lamina

31. What is gemination?
Local or systemic or hereditary
Dental tissues secreted as matrix in successive layers.
Tooth germ tries to divide
The ectomesenchyme - which was influenced by the neural crest cells

32. What are the mature cells for enamel?
Tooth germ tries to divide
Dental follicle
There are none - they are lost with eruption
Differentiation - proliferation - morphogenesis

33. What will the outer cells of the dental lamina differentiate into?
Abnormally large teeth
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Induction - proliferation
Dentin secreting cells (odontoblats)

34. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
The bud stage
The dental sac
The basement membrane

35. What does the cervical loop consist of?
The enamel organ is compressed
8th week
Induction
A bilayer rim that consists only IEE and OEE

36. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
The permanent molars
A bilayer rim that consists only IEE and OEE
Bud stage

37. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
11th to 12th weeks
Differentiation - proliferation - morphogenesis
Cementocytes

38. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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

39. What happens to the thickened non tooth producing portions of the dental lamina eventually?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The dental sac
Enamel secreting cells (ameloblasts)
Cementoid

40. When does dens in dente occur?
During the cap stage
6th to 7th weeks
Common on permanent molars or cingulum of anterior teeth
Compressed layer of flat to cuboidal cells

41. What is dens in dente?
The apposition of the enamel matrix
Enamel organ invaginates into the dental papilla
Osteoblasts
A mineralized cylinder - the dentinal tubule

42. What is microdontia?
Abnormally small teeth
The enamel organ is compressed
The stellate reticulum
11th to 12th weeks

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

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44. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Development of one or more extra teeth
Odontoblastic process
Enamel pearl - enamel dysplasia - and concresence
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

45. What are succedaneous teeth?
Inner
Preameloblasts
Traumatic injury or crowding of teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

46. Which teeth are nonsuccedaneous?
Only dentinal tubules with processes
Into odontoblasts
6th to 7th weeks
The permanent molars

47. What are the clinical ramifications?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectomesenchyme
Enamel pearl - enamel dysplasia - and concresence
Common on permanent molars or cingulum of anterior teeth

48. How many types of cells are found in the enamel organ in the bell stage?
The enamel organ is compressed
Extra cusp due to effects on enamel organ
Abnormally large teeth
4 types

49. What is the cap in the cap stage?
Dentin secreting cells (odontoblats)
The enamel organ
Tall columnar cells
Abnormally large teeth

50. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Dental follicle
The ectomesenchyme - which was influenced by the neural crest cells
Cementocytes
The outer cells of the dental papilla and the central cells of the dental papilla