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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 mature cells for dentin?
Only dentinal tubules with processes
Union of root structure of two or more teeth by cementum
Odontoblastic process
Induction

2. What happens during initiation?
Faulty development of enamel from interference involving ameloblasts
Induction
There are none - they are lost with eruption
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

3. What are the etiological factors for fusion?
Pressure on the area
A mineralized cylinder - the dentinal tubule
Cuboidal cells
Enamel

4. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Morphogenesis
Odontoblastic process
Tall columnar cells

5. What happens during the maturation stage?
Sphere of enamel on root
Connective
Abnormally small teeth
Dental tissues fully mineralize to their mature levels.

6. What happens during the bell stage?
The cervical loop
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

7. What is the primordium of the tooth?
The tooth germ
Epithelial
Faulty development of enamel from interference involving ameloblasts
The ameloblasts

8. What happens during the appositional stage?
Cementoblasts
Lines of Retzuis
The enamel - dentin - and cementum are secreted in successive layers
Initiation stage

9. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontoclasts
Cuboidal cells
Dental tissues fully mineralize to their mature levels.

10. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
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.
Enamel organ invaginates into the dental papilla
Tall columnar cells

11. What is enamel dysplasia?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Faulty development of enamel from interference involving ameloblasts
Cementocytes

12. What are the mature cells for cementum?
Sphere of enamel on root
The apposition of the enamel matrix
Cementocytes
The tooth germ

13. What are the formative cells for alveolar bone?
Osteoblasts
Preameloblasts
The ameloblasts
Differentiation

14. What is matrix?
The basement membrane that seperates the enamel organ and dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The cementum - PDL - and alveolar bone

15. How is the reduced enamel epithelium created?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
6th to 7th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The enamel organ is compressed

16. What layer serves as protection for the enamel organ?
The outer enamel epithelium
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Epithelial
Cementocytes

17. What are entrapped cementoblasts called?
Cementocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Absence of single or multiple teeth
The ameloblasts

18. Which layer in the bell stage has star shaped cells?
The stellate reticulum
The outer cells of the dental papilla and the central cells of the dental papilla
Dental tissues fully mineralize to their mature levels.
The actual vertical movement of the tooth

19. What are the etiological factors for dens in dente and gemination?
Dentin secreting cells (odontoblats)
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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary

20. The stellate reticulum is located inner or outer?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoblasts
Dental tissues secreted as matrix in successive layers.
Outer

21. What are the cell layers found in the enamel organ in the bell stage?
The enamel organ
Development of one or more extra teeth
In the cap stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

22. What are the clinical ramifications of micro/macrodontia?
The ectomesenchyme
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel secreting cells (ameloblasts)
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

23. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
The ectoderm
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Only dentinal tubules with processes

24. What hard tissue is innervated by nerves?
Cementocytes
The ectoderm
Dentin and alveolar bone
Osteocytes

25. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Dens in dente - gemination - tubercle - and fusion
Odontogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The outer cells of the dental papilla and the central cells of the dental papilla

26. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Odontoblastic process
Absence of single or multiple teeth
Only dentinal tubules with processes

27. What stage does the dental tissues subsequently fully mineralize
Oral epithelium
Future dentin and pulp tissue
The enamel - dentin - and cementum are secreted in successive layers
Maturation

28. What will the dental sac give rise to?
Absence of single or multiple teeth
Bud stage
Dental tissues fully mineralize to their mature levels.
The cementum - PDL - and alveolar bone

29. What is the main process involved in the bud stage?
Proliferation
Dental tissues secreted as matrix in successive layers.
Odontoclasts
Osteocytes

30. What are the clinical ramifications of enamel dysplasia?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There are none - they are lost with eruption
The enamel organ

31. What is the cap in the cap stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoblasts
Arrest and reversal lines
The enamel organ

32. What is concrescence?
It disintegrates as the developing oral mucosa comes to line the oral cavity
The primordium of the pulp
Hereditary in localized form. endocrine dysfunction is complete
Union of root structure of two or more teeth by cementum

33. What will the dental papilla eventually form?
The basement membrane
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
Future dentin and pulp tissue
The permanent molars

34. Active eruption
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The permanent molars
The actual vertical movement of the tooth
Morphogenesis

35. When does dens in dente occur?
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.
Common with permanent maxillary molars
During the cap stage
The enamel organ

36. What are the mature cells for alveolar bone?
Sphere of enamel on root
Osteocytes
Only dentinal tubules with processes
Dental tissues secreted as matrix in successive layers.

37. What is the embryological background for enamel?
Lines of Retzuis
May be confused as calculus deposit on root
Enamel organ
Dentin and alveolar bone

38. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Cementocytes
The dental lamina

39. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Epithelial
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The dental sac

40. What are the etiological factors of enamel dysplasia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Inner
Local or systemic or hereditary
Dental papilla

41. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Bud stage
There is unequal growth in different parts of the tooth bud
The cementum - PDL - and alveolar bone

42. What are the clinical ramifications of dens in dente?
Induction
Alveolar bone
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial rests of Malassez

43. What are the clinical ramifications of supernumerary teeth?
Dental papilla
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Displacement of ameloblasts to root surface
Cementocytes

44. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental papilla
Arrest and reversal lines
Connective

45. When does macro/microdontia occur?
Epithelial
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.
Initiation
Bud stage

46. What is the process involved in the maturation stage?
Maturation
Enamel secreting cells (ameloblasts)
There are none - they are lost with eruption
The permanent molars

47. What hard tissue has vascularity?
Epithelial
Alveolar bone
The outer enamel epithelium
Odontoblastic process

48. What are the clinical ramifications of enamel pearl?
Traumatic injury or crowding of teeth
Local or systemic or hereditary
May be confused as calculus deposit on root
The basement membrane that seperates the enamel organ and dental papilla

49. What is the main process involved in initiation?
Pressure on the area
Enamel organ
The basement membrane
Induction

50. Which teeth are nonsuccedaneous?
The outer enamel epithelium
Dental tissues secreted as matrix in successive layers.
The permanent molars
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy