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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. Where does the primordium of the permanent dentition develop?
Tooth germ
It disintegrates as the developing oral mucosa comes to line the oral cavity
May be confused as calculus deposit on root
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

2. What is concrescence?
Union of root structure of two or more teeth by cementum
6th to 7th weeks
Inner
The ectomesenchyme

3. What stage does supernumerary teeth occur?
Initiation
The outer cells of the dental papilla and the central cells of the dental papilla
Dental follicle
Epithelial

4. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The ameloblasts place an acellular dental cuticle on the new enamel surface
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Enamel

5. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Maturation
The enamel - dentin - and cementum are secreted in successive layers
Preameloblasts
Oral epithelium

6. Do odontoblasts start their secretion of matrix before the ameloblasts?
Dental papilla
Dental follicle
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Abnormally large teeth

7. What is the function of the Hertwig's epithelial root sheath?
Initiation
Common with permanent maxillary molars
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes

8. What will the dental papilla eventually form?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Future dentin and pulp tissue

9. When does the tooth bud become a tooth germ?
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
Imbrication lines of von Ebner
The dental sac
In the cap stage

10. Which teeth are nonsuccedaneous?
Imbrication lines of von Ebner
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Inner
The permanent molars

11. What is dens in dente?
Enamel organ invaginates into the dental papilla
The dental lamina
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
Osteocytes

12. What kind of cells occur in the inner enamel epithelium?
Future dentin and pulp tissue
The basement membrane
Differentiation - proliferation - morphogenesis
Tall columnar cells

13. What is matrix?
The basement membrane
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues fully mineralize to their mature levels.

14. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Cementoblasts
Dental tissues fully mineralize to their mature levels.
Dentin secreting cells (odontoblats)

15. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Lines of Retzuis
May be confused as calculus deposit on root
Cementoblasts
There are none - they are lost with eruption

16. What are the formative cells for cementum?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cementoblasts
Hereditary
The primordium of the pulp

17. What stage does anodontia occur?
Dental follicle
Initiation stage
Bud stage
Hereditary in localized form. endocrine dysfunction is complete

18. What is gemination?
Tooth germ tries to divide
The enamel organ is compressed
Lines of Retzuis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

19. What are the formative cells for enamel?
During the cap stage
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Ameloblasts
Only dentinal tubules with processes

20. What are the mature cells for cementum?
Dental papilla
Cementocytes
Alveolar bone
6th to 7th weeks

21. What is enamel dysplasia?
Osteoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal 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
Faulty development of enamel from interference involving ameloblasts

22. What is macrodontia?
In the cap stage
The ectomesenchyme
Traumatic injury or crowding of teeth
Abnormally large teeth

23. What are the clinical ramifications of anodontia?
Enamel secreting cells (ameloblasts)
Epithelial rests of Malassez
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Proliferation

24. What is the structure responsible for root development?
Union of root structure of two or more teeth by cementum
The cervical loop
Connective
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

25. When does the process of root development take place?
In the cap stage
The ectomesenchyme
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dens in dente - gemination - tubercle - and fusion

26. What are the cell layers found in the enamel organ in the bell stage?
The tooth germ
Enamel pearl - enamel dysplasia - and concresence
Ameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

27. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Dental papilla
Connective
Differentiation - proliferation - morphogenesis

28. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Epithelial
Enamel secreting cells (ameloblasts)
The ectomesenchyme

29. What are the mature cells for alveolar bone?
Osteocytes
Induction
Tall columnar cells
Only dentinal tubules with processes

30. What is an enamel pearl?
Sphere of enamel on root
Morphogenesis
Cementoid
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

31. What are the odontoblastic processes is contained in what?
Enamel
A mineralized cylinder - the dentinal tubule
Morphogenesis
Odontogenesis

32. What happens during the bud stage?
A mineralized cylinder - the dentinal tubule
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.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

33. What are the clinical ramifications of gemination?

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34. Active eruption
The dental sac
Local or systemic or hereditary
The basement membrane
The actual vertical movement of the tooth

35. What processes are involved with the apposition stage?
9th to 10th weeks
Preameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Induction - proliferation

36. The preameloblasts induce dental papilla cells to differentiate into what?
The ectomesenchyme
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane that seperates the enamel organ and dental papilla
Into odontoblasts

37. What is the cap in the cap stage?
Ameloblasts
The enamel organ
Initiation stage
Dentin secreting cells (odontoblats)

38. When does dens in dente occur?
Cementoblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
During the cap stage
Epithelial rests of Malassez

39. What are the clinical ramifications of enamel pearl?
There is unequal growth in different parts of the tooth bud
The ectoderm
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
May be confused as calculus deposit on root

40. What are the etiological factors of concrescence?
Oral epithelium
Traumatic injury or crowding of teeth
Enamel secreting cells (ameloblasts)
Only dentinal tubules with processes

41. What are the major components of the tooth germ?
Union of root structure of two or more teeth by cementum
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ - dental papilla - dental sac
The stellate reticulum

42. What are the formative cells for dentin?
Dens in dente - gemination - tubercle - and fusion
Odontoblastic process
Local or systemic or hereditary
Odontoblasts

43. What does the cervical loop consist of?
Extra cusp due to effects on enamel organ
A bilayer rim that consists only IEE and OEE
The permanent molars
Apposition of the cementum

44. What is the process involved in the maturation stage?
Dental follicle
Maturation
The enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface

45. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Only dentinal tubules with processes
The apposition of the enamel matrix
Enamel
The basement membrane

46. What hard tissue is innervated by nerves?
Development of one or more extra teeth
Extra cusp due to effects on enamel organ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dentin and alveolar bone

47. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
The dental lamina
Absence of single or multiple teeth
The actual vertical movement of the tooth

48. How many types of cells are found in the enamel organ in the bell stage?
Traumatic injury or crowding of teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
4 types
Ameloblasts

49. What are the incremental lines for dentin?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Maturation
Imbrication lines of von Ebner
Tall columnar cells

50. Where is the dental sac originally derived from?
The ectomesenchyme
Odontoblastic process
6th to 7th weeks
Enamel organ