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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 are succedaneous teeth?
Proliferation - differentiation - morphogenesis
Maturation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementocytes

2. What stage does supernumerary teeth occur?
Tall columnar cells
During the cap stage
Enamel organ
Initiation

3. What are the formative cells for enamel?
Dens in dente - gemination - tubercle - and fusion
Ameloblasts
Initiation stage
Abnormally large teeth

4. How many types of cells are found in the enamel organ in the bell stage?
8th week
Cementoblasts
4 types
The enamel organ - dental papilla - dental sac

5. What is the process involved in the maturation stage?
Maturation
Bud stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Tooth germ tries to divide

6. What is the predominate process in the bell 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
Cementoblasts
Differentiation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

7. What else undergoes proliferation in the bud stage besides the dental lamina?
Odontoblasts
The ectomesenchyme
Cementoblasts
Apposition of the cementum

8. What happens during the cap stage?
The stellate reticulum
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.
Inner
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

9. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Future dentin and pulp tissue
Dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The ectomesenchyme - which was influenced by the neural crest cells

10. What is anodontia?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Faulty development of enamel from interference involving ameloblasts
Odontoblasts
Absence of single or multiple teeth

11. What are the major components of the tooth germ?
8th week
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ - dental papilla - dental sac
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

12. What type of tissue is dentin - cementum - and alveolar bone?
The enamel organ
Differentiation - proliferation - morphogenesis
Local or systemic or hereditary
Connective

13. In the cap stage the tooth bud does not grow - what happens?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
There is unequal growth in different parts of the tooth bud
Abnormally large teeth
The ameloblasts

14. What are the formative cells for alveolar bone?
Osteoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The enamel organ - dental papilla - dental sac
A bilayer rim that consists only IEE and OEE

15. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Ameloblasts
Preameloblasts
There is unequal growth in different parts of the tooth bud
Dental papilla

16. What is enamel dysplasia?
Tooth germ tries to divide
Faulty development of enamel from interference involving ameloblasts
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.

17. What are supernumerary teeth?
4 types
The bud stage
Development of one or more extra teeth
Enamel secreting cells (ameloblasts)

18. Do odontoblasts start their secretion of matrix before the ameloblasts?
Hereditary
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

19. What are entrapped cementoblasts called?
Cementocytes
Cementoblasts
Osteocytes
Ameloblasts

20. What layer serves as protection for the enamel organ?
The permanent molars
Local or systemic or hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The outer enamel epithelium

21. What is the primordium of the tooth?
Alveolar bone
Union of root structure of two or more teeth by cementum
The tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

22. What is the main process involved in initiation?
Dentin secreting cells (odontoblats)
Induction
Initiation
In the cap stage

23. What type of tissue is enamel?
Epithelial
Cementoblasts
Bud stage
Dental papilla

24. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Dental tissues fully mineralize to their mature levels.
Epithelial rests of Malassez
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.
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

25. What is gemination?
The primordium of the pulp
The enamel organ - dental papilla - dental sac
4 types
Tooth germ tries to divide

26. The stellate reticulum is located inner or outer?
The dental sac
Differentiation - proliferation - morphogenesis
Outer
Into odontoblasts

27. What will the dental sac give rise to?
Cementoblasts
The basement membrane
The cementum - PDL - and alveolar bone
Arrest and reversal lines

28. What kind of cells occur in the inner enamel epithelium?
9th to 10th weeks
Tall columnar cells
Faulty development of enamel from interference involving ameloblasts
6th to 7th weeks

29. What do the odontoblasts do?
Dentin secreting cells (odontoblats)
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
A mineralized cylinder - the dentinal tubule
Enamel organ invaginates into the dental papilla

30. What happens during the appositional stage?
The basement membrane that seperates the enamel organ and dental papilla
Union of root structure of two or more teeth by cementum
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel - dentin - and cementum are secreted in successive layers

31. What are the clinical ramifications of supernumerary teeth?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoblasts
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Pressure on the area

32. Passive eruption
Compressed layer of flat to cuboidal cells
When the gingiva recedes and no actual tooth movement takes place
The tooth germ
Odontogenesis

33. Active eruption
A bilayer rim that consists only IEE and OEE
Dens in dente - gemination - tubercle - and fusion
May be confused as calculus deposit on root
The actual vertical movement of the tooth

34. What are the etiological factors for fusion?
Hereditary in localized form. endocrine dysfunction is complete
Cementocytes
Abnormally large teeth
Pressure on the area

35. When does dens in dente occur?
Dens in dente - gemination - tubercle - and fusion
Cuboidal cells
During the cap stage
Proliferation

36. What is concrescence?
Extra cusp due to effects on enamel organ
Union of root structure of two or more teeth by cementum
Local or systemic or 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

37. What are the clinical ramifications of enamel dysplasia?
The ectomesenchyme
Preameloblasts
Arrest and reversal lines
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

38. When does the tooth bud become a tooth germ?
Arrest and reversal lines
Hereditary
In the cap stage
The ectomesenchyme - which was influenced by the neural crest cells

39. Where is the enamal organ originally derived from?
Displacement of ameloblasts to root surface
Differentiation
Traumatic injury or crowding of teeth
The ectoderm

40. What happens during the maturation stage?
There is unequal growth in different parts of the tooth bud
Enamel secreting cells (ameloblasts)
A bilayer rim that consists only IEE and OEE
Dental tissues fully mineralize to their mature levels.

41. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
8th week
During the cap stage
Odontoclasts

42. What is another name for the dental sac?
Dental follicle
Maturation
Maturation
The outer cells of the dental papilla and the central cells of the dental papilla

43. What is microdontia?
Cementoid
The outer cells of the dental papilla and the central cells of the dental papilla
Arrest and reversal lines
Abnormally small teeth

44. What are the etiological factors of enamel dysplasia?
Extra cusp due to effects on enamel organ
Local or systemic or hereditary
The basement membrane that seperates the enamel organ and dental papilla
The outer enamel epithelium

45. What are the etiological factors of tubercle?
Dens in dente - gemination - tubercle - and fusion
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Only dentinal tubules with processes
Trauma - pressure or metabolic disease

46. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
The stellate reticulum
The enamel - dentin - and cementum are secreted in successive layers
The basement membrane

47. What are the formative cells for cementum?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
May be confused as calculus deposit on root
Into odontoblasts
Cementoblasts

48. What will the outer cells of the dental lamina differentiate into?
Osteoblasts
Proliferation - differentiation - morphogenesis
Initiation stage
Dentin secreting cells (odontoblats)

49. What are the incremental lines for enamel?
The permanent molars
Union of root structure of two or more teeth by cementum
Hereditary
Lines of Retzuis

50. What is the embryological background for enamel?
Osteoblasts
6th to 7th weeks
The cervical loop
Enamel organ