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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 happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
Union of 2 adjacent tooth germs
Osteoblasts
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

2. What is microdontia?
Osteocytes
Abnormally small teeth
Morphogenesis
Commonly involves permanent maxillary lateral incisor and 3rd molars

3. What is the time span for the bell stage?
Initiation stage
11th to 12th weeks
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 primordium of the pulp

4. In the cap stage the tooth bud does not grow - what happens?
Odontoclasts
Proliferation
There is unequal growth in different parts of the tooth bud
A bilayer rim that consists only IEE and OEE

5. When does the process of root development take place?
The primordium of the pulp
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Development of one or more extra teeth

6. What is gemination?
Extra cusp due to effects on enamel organ
Arrest and reversal lines
Tooth germ tries to divide
A mineralized cylinder - the dentinal tubule

7. What is the time span for initiation?
Outer
6th to 7th weeks
Ameloblasts
Dental papilla

8. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Faulty development of enamel from interference involving ameloblasts
The primordium of the pulp
Osteoblasts

9. What are the formative cells for enamel?
Ameloblasts
The ameloblasts
Alveolar bone
Initiation

10. What stage does supernumerary teeth occur?
Epithelial
Initiation
A bilayer rim that consists only IEE and OEE
Alveolar bone

11. When does macro/microdontia occur?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Bud stage
Initiation stage
Dentin and alveolar bone

12. How many types of cells are found in the enamel organ in the bell stage?
4 types
The ectoderm
Proliferation
The primordium of the pulp

13. What is tubercle?
4 types
Extra cusp due to effects on enamel organ
Proliferation
The actual vertical movement of the tooth

14. What are the clinical ramifications of dens in dente?
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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The primordium of the pulp

15. What stage does the dental tissues subsequently fully mineralize
Maturation
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
Alveolar bone
Dental papilla

16. Where is the dental sac originally derived from?
Odontoclasts
The ectomesenchyme
The actual vertical movement of the tooth
Extra cusp due to effects on enamel organ

17. What processes are involved in the bell stage?
Cementocytes
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation - proliferation - morphogenesis
The tooth germ

18. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ is compressed
Cementoid
Tooth germ tries to divide

19. What will the dental papilla eventually form?
Future dentin and pulp tissue
Dental tissues fully mineralize to their mature levels.
The cementum - PDL - and alveolar bone
Abnormally large teeth

20. What kind of cells reside in the stratum intermediate?
Hereditary
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Compressed layer of flat to cuboidal cells
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

21. What are the mature cells for dentin?
Imbrication lines of von Ebner
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
Only dentinal tubules with processes
Preameloblasts

22. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
It disintegrates as the developing oral mucosa comes to line the oral cavity
Odontoclasts

23. What type of tissue is enamel?
The permanent molars
Initiation stage
The ectomesenchyme - which was influenced by the neural crest cells
Epithelial

24. What is the predominate process of the cap stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Alveolar bone
Morphogenesis

25. What is the main process involved in initiation?
Inner
Odontoblastic process
Odontoblasts
Induction

26. What hard tissue is innervated by nerves?
Induction
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Common with permanent maxillary molars
Dentin and alveolar bone

27. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
9th to 10th weeks
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
Dentin secreting cells (odontoblats)

28. What is the main process involved in the bud stage?
Proliferation
Preameloblasts
4 types
Odontoblasts

29. What are the clinical ramifications of supernumerary teeth?
The ectomesenchyme
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
In the cap stage
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

30. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Osteoblasts
Morphogenesis
Initiation stage

31. When does dens in dente occur?
The apposition of the enamel matrix
During the cap stage
Epithelial rests of Malassez
9th to 10th weeks

32. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts
Local or systemic or hereditary
Preameloblasts

33. The preameloblasts induce dental papilla cells to differentiate into what?
The basement membrane
Enamel secreting cells (ameloblasts)
11th to 12th weeks
Into odontoblasts

34. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Initiation stage
6th to 7th weeks
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Odontoblastic process

35. What are the developmental disturbances of the cap stage?
Odontoblastic process
Initiation stage
Preameloblasts
Dens in dente - gemination - tubercle - and fusion

36. What are the incremental lines for cementum and alveolar bone?
Sphere of enamel on root
The enamel organ - dental papilla - dental sac
The enamel organ is compressed
Arrest and reversal lines

37. What will the inner cells of the dental lamina differentiates into?
Outer
Tall columnar cells
The primordium of the pulp
Enamel pearl - enamel dysplasia - and concresence

38. What will the outer cells of the dental lamina differentiate into?
Enamel secreting cells (ameloblasts)
Dentin secreting cells (odontoblats)
Dental tissues secreted as matrix in successive layers.
The permanent molars

39. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The ectomesenchyme
Compressed layer of flat to cuboidal cells
Cementoblasts
The primordium of the pulp

40. What are the etiological factors for anodontia?
Dens in dente - gemination - tubercle - and fusion
Dentin and alveolar bone
Hereditary in localized form. endocrine dysfunction is complete
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

41. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Dental papilla
The basement membrane
Connective
Local or systemic or hereditary

42. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Inner
It disintegrates as the developing oral mucosa comes to line the oral cavity
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ameloblasts place an acellular dental cuticle on the new enamel surface

43. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
The ectoderm
Ameloblasts
Epithelial rests of Malassez

44. What type of tissue is dentin - cementum - and alveolar bone?
Morphogenesis
Connective
Dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

45. What is the primordium of the tooth?
The outer enamel epithelium
The tooth germ
Dentin and alveolar bone
Dentin secreting cells (odontoblats)

46. What are the formative cells for dentin?
Odontoblasts
Hereditary
The cervical loop
During the cap stage

47. What is an enamel pearl?
Imbrication lines of von Ebner
Sphere of enamel on root
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental tissues fully mineralize to their mature levels.

48. What happens during the cap stage?
Union of 2 adjacent tooth germs
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
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.
Extra cusp due to effects on enamel organ

49. What are the etiological factors for supernumerary teeth?
The dental lamina
Hereditary
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
Compressed layer of flat to cuboidal cells

50. 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
Into odontoblasts
Cementocytes
The enamel organ