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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 formative cells for cementum?
Cementoblasts
Alveolar bone
Enamel secreting cells (ameloblasts)
Connective

2. What processes are involved with the apposition stage?
11th to 12th weeks
Abnormally small teeth
Induction - proliferation
Apposition of the cementum

3. What are the etiological factors of enamel dysplasia?
The dental lamina
Development of one or more extra teeth
Absence of single or multiple teeth
Local or systemic or hereditary

4. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Hereditary
The basement membrane
Initiation stage

5. What is concrescence?
Initiation stage
Cuboidal cells
Union of root structure of two or more teeth by cementum
The ectoderm

6. Where is the enamal organ originally derived from?
The outer enamel epithelium
Common with permanent maxillary molars
The ectoderm
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

7. The stellate reticulum is located inner or outer?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The bud stage
Outer

8. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
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
Enamel pearl - enamel dysplasia - and concresence

9. What happens during the bud stage?
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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
There are none - they are lost with eruption
During the cap stage

10. Where does the primordium of the permanent dentition develop?
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
Union of 2 adjacent tooth germs
Proliferation
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

11. What are the formative cells for dentin?
Osteocytes
The tooth germ
Odontoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

12. What stage does anodontia occur?
The ectomesenchyme - which was influenced by the neural crest cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Union of root structure of two or more teeth by cementum
Initiation stage

13. What is the predominate process in the bell stage?
Arrest and reversal lines
Differentiation
The enamel organ
Abnormally small teeth

14. What are the etiological factors for enamel pearl?
Cuboidal cells
Displacement of ameloblasts to root surface
Differentiation - proliferation - morphogenesis
Cementoid

15. What hard tissue is innervated by nerves?
Sphere of enamel on root
Maturation
Dentin and alveolar bone
Dental follicle

16. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Abnormally large teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoclasts
Commonly involves permanent maxillary lateral incisor and 3rd molars

17. How is the dentinocemental junction formed?
Cuboidal cells
Odontoblasts
Dental tissues secreted as matrix in successive layers.
As a result of the apposition of cementum over dentin

18. How is the reduced enamel epithelium created?
Cementocytes
Arrest and reversal lines
The enamel organ is compressed
Dentin and alveolar bone

19. What is the embryological background for dentin - cementum and alveolar bone?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ectoderm
Enamel organ
Dental papilla

20. What is anodontia?
Imbrication lines of von Ebner
Osteocytes
The primordium of the pulp
Absence of single or multiple teeth

21. What does the cervical loop consist of?
Into odontoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Tooth germ
A bilayer rim that consists only IEE and OEE

22. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Enamel secreting cells (ameloblasts)
Imbrication lines of von Ebner
The dental sac

23. What are the etiological factors for fusion?
During the cap stage
Pressure on the area
Compressed layer of flat to cuboidal cells
The dental lamina

24. When does dens in dente occur?
Abnormally large teeth
During the cap stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Absence of single or multiple teeth

25. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Extra cusp due to effects on enamel organ
Tooth germ
Union of 2 adjacent tooth germs

26. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Cementoblasts
Displacement of ameloblasts to root surface
There is unequal growth in different parts of the tooth bud

27. What are the mature cells for enamel?
As a result of the apposition of cementum over dentin
The actual vertical movement of the tooth
Odontoclasts
There are none - they are lost with eruption

28. What is matrix?
Cementocytes
Osteocytes
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Initiation

29. What stage does supernumerary teeth occur?
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation
Morphogenesis
Initiation

30. What are the cell layers found in the enamel organ in the bell 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
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentin and alveolar bone
Odontoclasts

31. What are entrapped cementoblasts called?
Outer
Cementocytes
11th to 12th weeks
Dentin secreting cells (odontoblats)

32. What is another name for the dental sac?
Enamel organ
Common on permanent molars or cingulum of anterior teeth
The ectomesenchyme - which was influenced by the neural crest cells
Dental follicle

33. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Tooth germ tries to divide
The basement membrane
Common on permanent molars or cingulum of anterior teeth
Odontoclasts

34. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Inner
Common with permanent maxillary molars
The ectomesenchyme - which was influenced by the neural crest cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

35. In the cap stage the tooth bud does not grow - what happens?
Local or systemic or hereditary
There is unequal growth in different parts of the tooth bud
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel secreting cells (ameloblasts)

36. What are the mature cells for cementum?
4 types
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
Cementocytes
Odontoclasts

37. What is cementogenisis?
Dental tissues secreted as matrix in successive layers.
Apposition of the cementum
Differentiation - proliferation - morphogenesis
Differentiation

38. What is the time span for the bell stage?
The ectomesenchyme - which was influenced by the neural crest cells
Dental tissues fully mineralize to their mature levels.
11th to 12th weeks
Into odontoblasts

39. What is the site for the future dentioenamel junction?
Enamel
The basement membrane that seperates the enamel organ and dental papilla
May be confused as calculus deposit on root
Odontogenesis

40. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Hereditary
Odontogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental follicle

41. What type of tissue is dentin - cementum - and alveolar bone?
Compressed layer of flat to cuboidal cells
Connective
The ectomesenchyme - which was influenced by the neural crest cells
The cementum - PDL - and alveolar bone

42. What is the process involved in the maturation stage?
Apposition of the cementum
Maturation
Dental tissues fully mineralize to their mature levels.
Odontoblastic process

43. When does macro/microdontia occur?
Dens in dente - gemination - tubercle - and fusion
Cementoblasts
Bud stage
Differentiation - proliferation - morphogenesis

44. What are the clinical ramifications of enamel pearl?
Cementocytes
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
The permanent molars

45. What is the cementum matrix called?
Cementoid
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Union of 2 adjacent tooth germs
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

46. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Imbrication lines of von Ebner
The basement membrane
The enamel organ is compressed
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

47. What is the time span for initiation?
Initiation
6th to 7th weeks
The ameloblasts place an acellular dental cuticle on the new enamel surface
Maturation

48. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Into odontoblasts
Differentiation - proliferation - morphogenesis
Preameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

49. What is tubercle?
Union of 2 adjacent tooth germs
Only dentinal tubules with processes
Extra cusp due to effects on enamel organ
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

50. What are the etiological factors for dens in dente and gemination?
Compressed layer of flat to cuboidal cells
Future dentin and pulp tissue
Alveolar bone
Hereditary