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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 is the main process involved in the bud stage?
Proliferation
Connective
Inner
Differentiation - proliferation - morphogenesis

2. What are the processes involved in the cap stage?
Preameloblasts
The dental sac
Proliferation - differentiation - morphogenesis
Absence of single or multiple teeth

3. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Differentiation
Odontoblastic process
Epithelial

4. What are entrapped cementoblasts called?
Inner
Cementocytes
Faulty development of enamel from interference involving ameloblasts
The enamel organ

5. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The actual vertical movement of the tooth
Enamel secreting cells (ameloblasts)
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel - dentin - and cementum are secreted in successive layers

6. What will the inner cells of the dental lamina differentiates into?
Faulty development of enamel from interference involving ameloblasts
4 types
Abnormally large teeth
The primordium of the pulp

7. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Enamel secreting cells (ameloblasts)
There is unequal growth in different parts of the tooth bud
Preameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

8. What are the formative cells for dentin?
Bud stage
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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

9. What are the major components of the tooth germ?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The ectomesenchyme - which was influenced by the neural crest cells
Trauma - pressure or metabolic disease
The enamel organ - dental papilla - dental sac

10. What are the clinical ramifications of concrescence?
Dental tissues secreted as matrix in successive layers.
Common with permanent maxillary molars
Cuboidal cells
Displacement of ameloblasts to root surface

11. What happens during the appositional stage?
Enamel organ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
The enamel - dentin - and cementum are secreted in successive layers

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

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13. 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
Dental tissues secreted as matrix in successive layers.
Tall columnar cells
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

14. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dental tissues secreted as matrix in successive layers.
Odontoblastic process
The cervical loop
Development of one or more extra teeth

15. In the cap stage the tooth bud does not grow - what happens?
Traumatic injury or crowding of teeth
There is unequal growth in different parts of the tooth bud
Oral epithelium
Cuboidal cells

16. What are the etiological factors for micro/macrodontia?
8th week
As a result of the apposition of cementum over dentin
Cuboidal cells
Hereditary in localized form. endocrine dysfunction is complete

17. What hard tissue is can not have tissue formation after eruption?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Proliferation - differentiation - morphogenesis
Extra cusp due to effects on enamel organ
Enamel

18. What stage does the dental tissues subsequently fully mineralize
Dental papilla
Initiation stage
Odontoblasts
Maturation

19. What are the mature cells for alveolar bone?
Osteocytes
The tooth germ
Initiation stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

20. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane
The stellate reticulum
Lines of Retzuis

21. What is amelogenisis?
Abnormally large teeth
Pressure on the area
The apposition of the enamel matrix
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.

22. What is concrescence?
Union of root structure of two or more teeth by cementum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental tissues secreted as matrix in successive layers.
Lines of Retzuis

23. What are the clinical ramifications of supernumerary teeth?
During the cap stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
6th to 7th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

24. What are the clinical ramifications of enamel pearl?
Pressure on the area
The actual vertical movement of the tooth
Epithelial
May be confused as calculus deposit on root

25. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Trauma - pressure or metabolic disease
Odontogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Union of 2 adjacent tooth germs

26. How is the dentinocemental junction formed?
Tooth germ tries to divide
As a result of the apposition of cementum over dentin
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
Osteoblasts

27. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Abnormally large teeth
Cementoid
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

28. What are the odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
Pressure on the area
Common with permanent maxillary molars
Oral epithelium

29. What are the mature cells for cementum?
Cementocytes
The ectomesenchyme
Enamel organ invaginates into the dental papilla
Ameloblasts

30. Where does the primordium of the permanent dentition develop?
Induction
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The tooth germ

31. What is the time span for the cap stage?
9th to 10th weeks
Abnormally small teeth
A mineralized cylinder - the dentinal tubule
Local or systemic or hereditary

32. What are the etiological factors for enamel pearl?
Local or systemic or hereditary
Displacement of ameloblasts to root surface
The outer enamel epithelium
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

33. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectoderm
Enamel organ

34. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Initiation stage
Dentin and alveolar bone
Tooth germ tries to divide

35. What is the outer portion of the ectoderm in the initiation stage?
Tooth germ
Oral epithelium
The permanent molars
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.

36. What are the incremental lines for cementum and alveolar bone?
Odontogenesis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme
Arrest and reversal lines

37. What processes are involved in the bell stage?
A bilayer rim that consists only IEE and OEE
Tooth germ
During the cap stage
Differentiation - proliferation - morphogenesis

38. What happens during initiation?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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 ameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

39. What will the dental papilla eventually form?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Future dentin and pulp tissue
Sphere of enamel on root
The ameloblasts

40. What is matrix?
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
The stellate reticulum
Epithelial rests of Malassez

41. What are the etiological factors for fusion?
Osteocytes
Pressure on the area
May be confused as calculus deposit on root
Cementoblasts

42. 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
Cementocytes
Displacement of ameloblasts to root surface
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.

43. What are the etiological factors of concrescence?
The cementum - PDL - and alveolar bone
The ectomesenchyme
Imbrication lines of von Ebner
Traumatic injury or crowding of teeth

44. What is dens in dente?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Differentiation - proliferation - morphogenesis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ invaginates into the dental papilla

45. What is the time span for initiation?
6th to 7th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Union of root structure of two or more teeth by cementum
The enamel organ

46. What is the process involved in the maturation stage?
Future dentin and pulp tissue
Inner
The enamel - dentin - and cementum are secreted in successive layers
Maturation

47. Which teeth are nonsuccedaneous?
There are none - they are lost with eruption
The permanent molars
Pressure on the area
Dentin and alveolar bone

48. Which layer in the bell stage has star shaped cells?
The stellate reticulum
Oral epithelium
Local or systemic or hereditary
Bud stage

49. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Enamel organ invaginates into the dental papilla
Compressed layer of flat to cuboidal cells
Cementoblasts

50. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
The ameloblasts
Proliferation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification