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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 causes the induction of the preameloblasts to differentiate into ameloblasts?
The cementum - PDL - and alveolar bone
Traumatic injury or crowding of teeth
The cervical loop
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

2. What wll the inner enamel epithelium differentiate into?
Faulty development of enamel from interference involving ameloblasts
The actual vertical movement of the tooth
There is unequal growth in different parts of the tooth bud
Enamel secreting cells (ameloblasts)

3. What is microdontia?
Induction
Abnormally small teeth
The ectomesenchyme - which was influenced by the neural crest cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

4. Which teeth are nonsuccedaneous?
The permanent molars
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
May be confused as calculus deposit on root

5. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Epithelial
Tooth germ tries to divide
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementoblasts

6. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Preameloblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Only dentinal tubules with processes

7. What is the time span for the bud stage?
Induction
Into odontoblasts
8th week
6th to 7th weeks

8. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Commonly involves permanent maxillary lateral incisor and 3rd molars
4 types

9. Do odontoblasts start their secretion of matrix before the ameloblasts?
Into odontoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Displacement of ameloblasts to root surface
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

10. What are the formative cells for cementum?
Oral epithelium
Cementoblasts
4 types
Common with permanent maxillary molars

11. What are the etiological factors for fusion?
Pressure on the area
Union of 2 adjacent tooth germs
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dens in dente - gemination - tubercle - and fusion

12. Tooth development
Proliferation - differentiation - morphogenesis
Differentiation
Odontogenesis
The basement membrane

13. Active eruption
Commonly involves permanent maxillary lateral incisor and 3rd molars
The actual vertical movement of the tooth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane

14. What is an enamel pearl?
Common with permanent maxillary molars
Sphere of enamel on root
Extra cusp due to effects on enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface

15. What happens during the cap stage?
The ectomesenchyme
Oral epithelium
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
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.

16. What stage does supernumerary teeth occur?
Initiation
Cuboidal cells
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ

17. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cuboidal cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

18. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The basement membrane
Odontoblastic process
The actual vertical movement of the tooth
Tooth germ

19. What happens during the bud stage?
Odontoblasts
Into odontoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dens in dente - gemination - tubercle - and fusion

20. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The outer cells of the dental papilla and the central cells of the dental papilla
The dental sac
Osteoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

21. What is cementogenisis?
Maturation
Apposition of the cementum
Induction - proliferation
Cementoid

22. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Connective
A mineralized cylinder - the dentinal tubule
During the cap stage

23. What are the etiological factors for micro/macrodontia?
Into odontoblasts
Maturation
Dentin secreting cells (odontoblats)
Hereditary in localized form. endocrine dysfunction is complete

24. What is dens in dente?
Dental tissues secreted as matrix in successive layers.
Enamel organ invaginates into the dental papilla
Ameloblasts
The enamel organ

25. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Epithelial rests of Malassez
A mineralized cylinder - the dentinal tubule
Abnormally large teeth

26. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Absence of single or multiple teeth
The ameloblasts
The primordium of the pulp
There are none - they are lost with eruption

27. What are the formative cells for alveolar bone?
The enamel organ - dental papilla - dental sac
The ectomesenchyme - which was influenced by the neural crest cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Osteoblasts

28. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The actual vertical movement of the tooth
Future dentin and pulp tissue
The basement membrane

29. What are the clinical ramifications of dens in dente?
9th to 10th weeks
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel organ invaginates into the dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

30. What hard tissue is can not have tissue formation after eruption?
Enamel
Absence of single or multiple teeth
Dental follicle
There are none - they are lost with eruption

31. What are the incremental lines for dentin?
Hereditary in localized form. endocrine dysfunction is complete
Extra cusp due to effects on enamel organ
Imbrication lines of von Ebner
Apposition of the cementum

32. What is the process involved in the maturation stage?
The enamel organ is compressed
Pressure on the area
Inner
Maturation

33. What are entrapped cementoblasts called?
Cementocytes
A bilayer rim that consists only IEE and OEE
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

34. What is the time span for the cap stage?
9th to 10th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dens in dente - gemination - tubercle - and fusion
Ameloblasts

35. How many types of cells are found in the enamel organ 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
4 types
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
When the gingiva recedes and no actual tooth movement takes place

36. What happens during initiation?
The enamel organ
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 enamel - dentin - and cementum are secreted in successive layers
Absence of single or multiple teeth

37. What are the mature cells for alveolar bone?
Osteocytes
The dental sac
Maturation
6th to 7th weeks

38. What kind of cells occur in the inner enamel epithelium?
The enamel organ is compressed
Cementocytes
Dens in dente - gemination - tubercle - and fusion
Tall columnar cells

39. How is the reduced enamel epithelium created?
The enamel organ is compressed
Enamel
Epithelial
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

40. What are supernumerary teeth?
The primordium of the pulp
Initiation
Development of one or more extra teeth
When the gingiva recedes and no actual tooth movement takes place

41. What will the dental sac give rise to?
Maturation
The cementum - PDL - and alveolar bone
Initiation stage
The enamel organ is compressed

42. What happens during the apposition stage?
Proliferation - differentiation - morphogenesis
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 tissues secreted as matrix in successive layers.
Common with permanent maxillary molars

43. What hard tissue is innervated by nerves?
Dentin and alveolar bone
The enamel organ - dental papilla - dental sac
Connective
Odontoblastic process

44. When does the process of root development take place?
The enamel - dentin - and cementum are secreted in successive layers
A bilayer rim that consists only IEE and OEE
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

45. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Abnormally large teeth
Cuboidal cells

46. What are the incremental lines for cementum and alveolar bone?
Enamel secreting cells (ameloblasts)
Arrest and reversal lines
Sphere of enamel on root
During the cap stage

47. What processes are involved in the bell stage?
Cementoblasts
The dental sac
Abnormally large teeth
Differentiation - proliferation - morphogenesis

48. What are the major components of the tooth germ?
9th to 10th weeks
The enamel organ - dental papilla - dental sac
Traumatic injury or crowding of teeth
The cervical loop

49. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Sphere of enamel on root
Compressed layer of flat to cuboidal cells
Abnormally large teeth

50. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Trauma - pressure or metabolic disease
The apposition of the enamel matrix
Preameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme