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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. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

2. What is the time span for initiation?
Enamel organ invaginates into the dental papilla
The enamel organ is compressed
The ectomesenchyme
6th to 7th weeks

3. When does the tooth bud become a tooth germ?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Proliferation - differentiation - morphogenesis
In the cap stage
Faulty development of enamel from interference involving ameloblasts

4. What is the predominate process in the bell stage?
Differentiation
The basement membrane
Cementoid
Dental papilla

5. What are the clinical ramifications of enamel dysplasia?
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 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 that seperates the enamel organ and dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

6. What is gemination?
Tooth germ tries to divide
9th to 10th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Common on permanent molars or cingulum of anterior teeth

7. What is the main process involved in initiation?
Lines of Retzuis
Induction
Enamel
Connective

8. What are the etiological factors for supernumerary teeth?
Differentiation
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
Development of one or more extra teeth
Hereditary

9. What happens during initiation?
As a result of the apposition of cementum over dentin
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 permanent molars
Dentin and alveolar bone

10. What are the clinical ramifications of gemination?

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11. Where is the dental sac originally derived from?
The ectomesenchyme
May be confused as calculus deposit on root
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

12. What processes are involved in the bell stage?
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Differentiation - proliferation - morphogenesis
Enamel

13. What are the mature cells for dentin?
Only dentinal tubules with processes
Local or systemic or hereditary
The ectomesenchyme
Cuboidal cells

14. What happens during the bell stage?
Odontoclasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Sphere of enamel on root

15. The stratum intermediate is located inner or outer?
Tall columnar cells
The ectomesenchyme
Maturation
Inner

16. What kind of cells reside in the stratum intermediate?
Traumatic injury or crowding of teeth
Compressed layer of flat to cuboidal cells
Hereditary
The dental lamina

17. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Maturation
The outer cells of the dental papilla and the central cells of the dental papilla
The dental sac
There are none - they are lost with eruption

18. What are the incremental lines for enamel?
Dental papilla
Epithelial
Enamel organ
Lines of Retzuis

19. When does macro/microdontia occur?
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Bud stage
Enamel organ invaginates into the dental papilla

20. What are the processes involved in the cap stage?
Odontogenesis
During the cap stage
Proliferation - differentiation - morphogenesis
There is unequal growth in different parts of the tooth bud

21. What are the major components of the tooth germ?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
During the cap stage
Apposition of the cementum
The enamel organ - dental papilla - dental sac

22. What is the function of the Hertwig's epithelial root sheath?
Abnormally large teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Common on permanent molars or cingulum of anterior teeth
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

23. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
11th to 12th weeks
In the cap stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

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

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25. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Cementoid
Osteoblasts
Cementocytes

26. What processes are involved with the apposition stage?
The enamel organ - dental papilla - dental sac
Induction - proliferation
Cementocytes
The permanent molars

27. What hard tissue is can not have tissue formation after eruption?
Enamel
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentin secreting cells (odontoblats)
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

28. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
A bilayer rim that consists only IEE and OEE
Cementoblasts
Epithelial rests of Malassez
Odontogenesis

29. What does the cervical loop consist of?
Odontoblastic process
A bilayer rim that consists only IEE and OEE
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Future dentin and pulp tissue

30. What is the time span for the bud stage?
The basement membrane that seperates the enamel organ and dental papilla
8th week
In the cap stage
Sphere of enamel on root

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Local or systemic or hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Union of 2 adjacent tooth germs
Dental papilla

32. What are the etiological factors for anodontia?
Abnormally small teeth
Osteoblasts
Dental tissues secreted as matrix in successive layers.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

33. What are the mature cells for alveolar bone?
Osteocytes
Local or systemic or hereditary
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.
4 types

34. What are the formative cells for enamel?
The dental sac
Displacement of ameloblasts to root surface
Ameloblasts
There is unequal growth in different parts of the tooth bud

35. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation - proliferation - morphogenesis
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

36. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentin and alveolar bone
The ectomesenchyme

37. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
May be confused as calculus deposit on root
Dentin secreting cells (odontoblats)
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

38. What are the clinical ramifications of fusion?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Morphogenesis
The cervical loop
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

39. What hard tissue has vascularity?
Dentin secreting cells (odontoblats)
Alveolar bone
Displacement of ameloblasts to root surface
Hereditary

40. What is the primordium of the tooth?
Faulty development of enamel from interference involving ameloblasts
The apposition of the enamel matrix
The tooth germ
Induction

41. What are the clinical ramifications?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tall columnar cells
Commonly involves permanent maxillary lateral incisor and 3rd molars
Common on permanent molars or cingulum of anterior teeth

42. Tooth development
Cementoid
Odontogenesis
During the cap stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

43. What is the structure responsible for root development?
Imbrication lines of von Ebner
The cervical loop
Dentin and alveolar bone
Local or systemic or hereditary

44. What stage does the dental tissues subsequently fully mineralize
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblasts
Maturation
Lines of Retzuis

45. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Preameloblasts
The ameloblasts
The actual vertical movement of the tooth
The cementum - PDL - and alveolar bone

46. What are the etiological factors for fusion?
Hereditary in localized form. endocrine dysfunction is complete
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.
4 types
Pressure on the area

47. The oral epithelium is induced by the ectomesenchyme to produce what?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer cells of the dental papilla and the central cells of the dental papilla
The dental lamina
Proliferation

48. What is the site for the future dentioenamel junction?
The ectoderm
The basement membrane that seperates the enamel organ and dental papilla
Cuboidal cells
Odontoblasts

49. What will the outer cells of the dental lamina differentiate into?
Differentiation
Initiation
Dentin secreting cells (odontoblats)
The ameloblasts place an acellular dental cuticle on the new enamel surface

50. What will the dental sac give rise to?
Cementoblasts
There is unequal growth in different parts of the tooth bud
The outer enamel epithelium
The cementum - PDL - and alveolar bone