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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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1. Which layer in the bell stage has star shaped cells?
Local or systemic or hereditary
Enamel organ
The ectomesenchyme - which was influenced by the neural crest cells
The stellate reticulum

2. What are the developmental disturbances of the cap stage?
Hereditary in localized form. endocrine dysfunction is complete
Dens in dente - gemination - tubercle - and fusion
Cementocytes
Proliferation - differentiation - morphogenesis

3. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
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
Outer
Cementoblasts

4. What are the clinical ramifications of micro/macrodontia?
The permanent molars
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
Sphere of enamel on root

5. What are the mature cells for alveolar bone?
The outer cells of the dental papilla and the central cells of the dental papilla
Ameloblasts
Osteocytes
Dens in dente - gemination - tubercle - and fusion

6. What is the function of the Hertwig's epithelial root sheath?
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
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Oral epithelium
Into odontoblasts

7. What are the etiological factors for dens in dente and gemination?
The bud stage
The apposition of the enamel matrix
Hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

8. What is an enamel pearl?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Sphere of enamel on root
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Maturation

9. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The ectomesenchyme
Bud stage
Hereditary in localized form. endocrine dysfunction is complete

10. What are entrapped cementoblasts called?
Enamel
There are none - they are lost with eruption
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementocytes

11. What happens during initiation?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the 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
Dentin secreting cells (odontoblats)
Tall columnar cells

12. What is the predominate process of the cap stage?
Morphogenesis
Cementoblasts
Preameloblasts
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

13. What are the mature cells for cementum?
Cementocytes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane

14. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Cementocytes
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Osteocytes

15. What happens during the apposition stage?
Maturation
Induction
Cementoblasts
Dental tissues secreted as matrix in successive layers.

16. What does the cervical loop consist of?
Lines of Retzuis
Differentiation - proliferation - morphogenesis
A bilayer rim that consists only IEE and OEE
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

17. What are the etiological factors for anodontia?
11th to 12th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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

18. Do odontoblasts start their secretion of matrix before the ameloblasts?
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
Abnormally small teeth
There is unequal growth in different parts of the tooth bud

19. What are the clinical ramifications of enamel pearl?
The basement membrane that seperates the enamel organ and dental papilla
May be confused as calculus deposit on root
Morphogenesis
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

20. Where is the dental papilla originally derived from?
Union of 2 adjacent tooth germs
11th to 12th weeks
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ectomesenchyme - which was influenced by the neural crest cells

21. What else undergoes proliferation in the bud stage besides the dental lamina?
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme
Enamel secreting cells (ameloblasts)
During the cap stage

22. What are the mature cells for dentin?
Only dentinal tubules with processes
Proliferation - differentiation - morphogenesis
Enamel organ invaginates into the dental papilla
Ameloblasts

23. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Osteocytes
Dental tissues secreted as matrix in successive layers.

24. What processes are involved with the apposition stage?
The enamel organ is compressed
Induction - proliferation
Differentiation - proliferation - morphogenesis
Extra cusp due to effects on enamel organ

25. What stage does the dental tissues subsequently fully mineralize
Future dentin and pulp tissue
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Maturation
Odontogenesis

26. Where is the dental sac originally derived from?
Ameloblasts
Into odontoblasts
The ectomesenchyme
Trauma - pressure or metabolic disease

27. How is the reduced enamel epithelium created?
The enamel organ is compressed
The cementum - PDL - and alveolar bone
Pressure on the area
Arrest and reversal lines

28. What are the formative cells for dentin?
It disintegrates as the developing oral mucosa comes to line the oral cavity
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoblasts
Differentiation

29. What is the embryological background for dentin - cementum and alveolar bone?
The cervical loop
Preameloblasts
Dental papilla
Tooth germ

30. What kind of cells occur in the inner enamel 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
Tall columnar cells
The enamel organ - dental papilla - dental sac
Pressure on the area

31. What are the mature cells for enamel?
There are none - they are lost with eruption
The bud stage
Into odontoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

32. What are the clinical ramifications of gemination?

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33. What are the clinical ramifications of enamel dysplasia?
Hereditary
Bud stage
Hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

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

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35. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ameloblasts
Development of one or more extra teeth
Enamel organ invaginates into the dental papilla

36. In the cap stage the tooth bud does not grow - what happens?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
There is unequal growth in different parts of the tooth bud
The outer enamel epithelium
The basement membrane

37. What are the clinical ramifications of dens in dente?
Dental follicle
Inner
Dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

38. How is the dentinocemental junction formed?
Only dentinal tubules with processes
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
There is unequal growth in different parts of the tooth bud

39. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ectoderm
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
The basement membrane
Pressure on the area

40. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementocytes
Cementoblasts
Odontoclasts
9th to 10th weeks

41. What are the etiological factors for enamel pearl?
Future dentin and pulp tissue
The outer cells of the dental papilla and the central cells of the dental papilla
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface

42. What is the site for the future dentioenamel junction?
Dental tissues secreted as matrix in successive layers.
The basement membrane that seperates the enamel organ and dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoblasts

43. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Hereditary
Tooth germ tries to divide
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

44. What stage does supernumerary teeth occur?
Initiation
Future dentin and pulp tissue
The basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

45. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
The enamel organ
Differentiation - proliferation - morphogenesis
Cementocytes

46. 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
Oral epithelium
Enamel pearl - enamel dysplasia - and concresence
The basement membrane

47. What are the development disturbances of the apposition and maturation stages?
Union of root structure of two or more teeth by cementum
The basement membrane
Differentiation - proliferation - morphogenesis
Enamel pearl - enamel dysplasia - and concresence

48. What is the time span for the bud stage?
8th week
Enamel pearl - enamel dysplasia - and concresence
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction

49. What is dens in dente?
Tooth germ tries to divide
The outer cells of the dental papilla and the central cells of the dental papilla
The cervical loop
Enamel organ invaginates into the dental papilla

50. What is gemination?
Apposition of the cementum
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Tooth germ tries to divide