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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. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The cementum - PDL - and alveolar bone
11th to 12th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

2. What happens during initiation?
The actual vertical movement of the tooth
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
Dental tissues secreted as matrix in successive layers.
Inner

3. What are the clinical ramifications of enamel dysplasia?
Absence of single or multiple teeth
Induction
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

4. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Hereditary
Enamel
Cementocytes

5. When does macro/microdontia occur?
Bud stage
Absence of single or multiple teeth
Preameloblasts
Tooth germ

6. What are the incremental lines for cementum and alveolar bone?
The apposition of the enamel matrix
Arrest and reversal lines
During the cap stage
Extra cusp due to effects on enamel organ

7. What stage does the dental tissues subsequently fully mineralize
Tooth germ tries to divide
Maturation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
There are none - they are lost with eruption

8. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The tooth germ

9. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
The outer cells of the dental papilla and the central cells of the dental papilla
Differentiation - proliferation - morphogenesis
Tooth germ

10. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The bud stage
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

11. What is cementogenisis?
The enamel organ is compressed
The basement membrane
Apposition of the cementum
Cementocytes

12. What are supernumerary teeth?
Outer
Common with permanent maxillary molars
Development of one or more extra teeth
During the cap stage

13. What is the embryological background for enamel?
The ectomesenchyme
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Imbrication lines of von Ebner
Enamel organ

14. The stratum intermediate is located inner or outer?
Cementocytes
Local or systemic or hereditary
Enamel organ
Inner

15. What is the predominate process in the bell stage?
Sphere of enamel on root
The enamel organ
Differentiation
6th to 7th weeks

16. What are the formative cells for dentin?
The ectoderm
The cervical loop
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoblasts

17. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Compressed layer of flat to cuboidal cells
Odontoblastic process
Arrest and reversal lines
Odontoblasts

18. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
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
Apposition of the cementum
Compressed layer of flat to cuboidal cells

19. What are the formative cells for enamel?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Ameloblasts
Compressed layer of flat to cuboidal cells
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

20. 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
Enamel
Tall columnar cells
Dens in dente - gemination - tubercle - and fusion

21. What are the mature cells for alveolar bone?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Common with permanent maxillary molars
Osteocytes
It disintegrates as the developing oral mucosa comes to line the oral cavity

22. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Cementoblasts
The ameloblasts
Abnormally small teeth
Odontogenesis

23. Passive eruption
Initiation
Tooth germ
Apposition of the cementum
When the gingiva recedes and no actual tooth movement takes place

24. What are the clinical ramifications of supernumerary teeth?
Dental tissues secreted as matrix in successive layers.
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
As a result of the apposition of cementum over dentin
Cementocytes

25. The stellate reticulum is located inner or outer?
Alveolar bone
Outer
Odontoclasts
Abnormally small teeth

26. How many types of cells are found in the enamel organ in the bell stage?
Dentin and alveolar bone
Common on permanent molars or cingulum of anterior teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
4 types

27. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The ameloblasts
Displacement of ameloblasts to root surface
Odontoclasts
Dentin and alveolar bone

28. Where is the enamal organ originally derived from?
The ectomesenchyme
The ectoderm
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

29. What hard tissue is innervated by nerves?
The primordium of the pulp
Dentin and alveolar bone
The enamel organ
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.

30. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Proliferation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoblastic process
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

31. What type of tissue is dentin - cementum - and alveolar bone?
Differentiation
The basement membrane
Connective
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

32. What is tubercle?
The basement membrane that seperates the enamel organ and dental papilla
Epithelial
The bud stage
Extra cusp due to effects on enamel organ

33. What will the dental sac give rise to?
The dental sac
Cementocytes
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

34. What are the formative cells for cementum?
The ectomesenchyme - which was influenced by the neural crest cells
When the gingiva recedes and no actual tooth movement takes place
Cementoblasts
A bilayer rim that consists only IEE and OEE

35. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Local or systemic or hereditary
Preameloblasts
Arrest and reversal lines
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

36. What are the clinical ramifications of anodontia?
Enamel
Dental follicle
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Odontogenesis

37. What happens when the reduced enamel epithelium is created?
Cementoblasts
Inner
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
A mineralized cylinder - the dentinal tubule

38. What is the main process involved in initiation?
There is unequal growth in different parts of the tooth bud
The enamel organ - dental papilla - dental sac
Induction
The ectoderm

39. 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
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The bud stage
Only dentinal tubules with processes

40. What happens during the appositional stage?
Preameloblasts
The enamel - dentin - and cementum are secreted in successive layers
Epithelial
Epithelial rests of Malassez

41. What is an enamel pearl?
Lines of Retzuis
Epithelial
Sphere of enamel on root
The basement membrane that seperates the enamel organ and dental papilla

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

43. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Maturation
Dental follicle
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

44. What is the process involved in the maturation stage?
Maturation
Enamel secreting cells (ameloblasts)
Enamel
8th week

45. What is the time span for the bud stage?
8th week
The cementum - PDL - and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

46. The oral epithelium is induced by the ectomesenchyme to produce what?
The outer cells of the dental papilla and the central cells of the dental papilla
The dental lamina
Dentin secreting cells (odontoblats)
As a result of the apposition of cementum over dentin

47. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Alveolar bone
Odontogenesis
Tooth germ tries to divide

48. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Tooth germ tries to divide
Initiation stage

49. What are the incremental lines for enamel?
Odontogenesis
Compressed layer of flat to cuboidal cells
Lines of Retzuis
May be confused as calculus deposit on root

50. What kind of cells reside in the stratum intermediate?
Proliferation
Osteocytes
Compressed layer of flat to cuboidal cells
An extracellular substance that is partially calcified - yet serves as a framework for later calcification