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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 the clinical ramifications of fusion?
The enamel organ is compressed
Enamel secreting cells (ameloblasts)
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Initiation

2. How many types of cells are found in the enamel organ in the bell stage?
Tooth germ tries to divide
Arrest and reversal lines
The ectomesenchyme
4 types

3. Do odontoblasts start their secretion of matrix before the ameloblasts?
Induction - proliferation
Pressure on the area
Outer
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

4. What are the formative cells for enamel?
Ameloblasts
Proliferation
Inner
The enamel - dentin - and cementum are secreted in successive layers

5. What are the incremental lines for cementum and alveolar bone?
Maturation
The enamel organ is compressed
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

6. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Dentin secreting cells (odontoblats)
Enamel organ invaginates into the dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

7. What is the cementum matrix called?
There are none - they are lost with eruption
Cementoid
Local or systemic or hereditary
Dental tissues fully mineralize to their mature levels.

8. What is the process involved in the maturation stage?
Extra cusp due to effects on enamel organ
Maturation
Only dentinal tubules with processes
Oral epithelium

9. What happens when the reduced enamel epithelium is created?
Initiation
Sphere of enamel on root
Maturation
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

10. What are the mature cells for cementum?
Hereditary in localized form. endocrine dysfunction is complete
Cementocytes
In the cap stage
Future dentin and pulp tissue

11. What are the clinical ramifications of enamel dysplasia?
The basement membrane that seperates the enamel organ and dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Epithelial
Dental papilla

12. What are the major components of the tooth germ?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel organ - dental papilla - dental sac
As a result of the apposition of cementum over dentin
The enamel organ

13. What happens during the bell stage?
Enamel pearl - enamel dysplasia - and concresence
Outer
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The permanent molars

14. What stage does anodontia occur?
Initiation 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.
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dentin and alveolar bone

15. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Enamel
The tooth germ
Hereditary

16. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
The ectomesenchyme
The stellate reticulum
Common with permanent maxillary molars

17. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
The basement membrane that seperates the enamel organ and dental papilla
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
Dental papilla

18. What stage does supernumerary teeth occur?
Dentin secreting cells (odontoblats)
Hereditary
May be confused as calculus deposit on root
Initiation

19. What is the time span for initiation?
The cementum - PDL - and alveolar bone
6th to 7th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementoblasts

20. What processes are involved with the apposition stage?
Dentin secreting cells (odontoblats)
Induction - proliferation
Maturation
Union of 2 adjacent tooth germs

21. What is tubercle?
Extra cusp due to effects on enamel organ
A bilayer rim that consists only IEE and OEE
Odontoclasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

22. What type of tissue is enamel?
The primordium of the pulp
Hereditary
Epithelial
Arrest and reversal lines

23. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Tooth germ tries to divide
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel pearl - enamel dysplasia - and concresence

24. What are the etiological factors for enamel pearl?
Dental tissues fully mineralize to their mature levels.
Osteocytes
The enamel - dentin - and cementum are secreted in successive layers
Displacement of ameloblasts to root surface

25. What is cementogenisis?
Apposition of the cementum
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
Tooth germ tries to divide

26. The stratum intermediate is located inner or outer?
Faulty development of enamel from interference involving ameloblasts
The permanent molars
Inner
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

27. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Hereditary
The stellate reticulum
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

28. What are the incremental lines for enamel?
Lines of Retzuis
Into odontoblasts
Union of 2 adjacent tooth germs
Traumatic injury or crowding of teeth

29. What are the odontoblastic processes is contained in what?
The tooth germ
Enamel secreting cells (ameloblasts)
A mineralized cylinder - the dentinal tubule
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

30. What is macrodontia?
Abnormally small teeth
Abnormally large teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Apposition of the cementum

31. What will the dental sac give rise to?
Tooth germ tries to divide
9th to 10th weeks
The basement membrane that seperates the enamel organ and dental papilla
The cementum - PDL - and alveolar bone

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

33. What hard tissue is can not have tissue formation after eruption?
Enamel
Induction - proliferation
Initiation stage
Proliferation - differentiation - morphogenesis

34. Tooth development
Into odontoblasts
Tooth germ tries to divide
Imbrication lines of von Ebner
Odontogenesis

35. What are the mature cells for dentin?
Union of root structure of two or more teeth by cementum
Hereditary
Only dentinal tubules with processes
Alveolar bone

36. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Arrest and reversal lines
The actual vertical movement of the tooth
The bud stage
Dental tissues secreted as matrix in successive layers.

37. What will the dental papilla eventually form?
Future dentin and pulp tissue
Dentin and alveolar bone
4 types
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

38. What is gemination?
Arrest and reversal lines
Initiation
Tooth germ tries to divide
Absence of single or multiple teeth

39. What else undergoes proliferation in the bud stage besides the dental lamina?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The cervical loop
When the gingiva recedes and no actual tooth movement takes place
The ectomesenchyme

40. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontoblastic process
Arrest and reversal lines
Osteocytes

41. Where does the primordium of the permanent dentition develop?
Epithelial rests of Malassez
The enamel organ
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues fully mineralize to their mature levels.

42. When does the process of root development take place?
Dental tissues fully mineralize to their mature levels.
Cementocytes
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
It disintegrates as the developing oral mucosa comes to line the oral cavity

43. What happens during the bud stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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.
A bilayer rim that consists only IEE and OEE

44. What are the etiological factors for dens in dente and gemination?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The outer cells of the dental papilla and the central cells of the dental papilla
Hereditary
Cementoblasts

45. What is the time span for the bud stage?
8th week
In the cap stage
Into odontoblasts
Differentiation - proliferation - morphogenesis

46. What are the etiological factors for micro/macrodontia?
Odontoblasts
Displacement of ameloblasts to root surface
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane

47. What is the site for the future dentioenamel junction?
Tooth germ
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 basement membrane that seperates the enamel organ and dental papilla
Trauma - pressure or metabolic disease

48. What stage does the dental tissues subsequently fully mineralize
The enamel organ
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Outer
Maturation

49. What are the clinical ramifications of dens in dente?
Apposition of the cementum
Preameloblasts
Pressure on the area
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

50. In the cap stage the tooth bud does not grow - what happens?
Odontoblastic process
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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
There is unequal growth in different parts of the tooth bud