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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the predominate process of the cap stage?
Lines of Retzuis
Morphogenesis
May be confused as calculus deposit on root
Arrest and reversal lines

2. What are the formative cells for alveolar bone?
Osteoblasts
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoid
Common with permanent maxillary molars

3. What are the processes involved in the cap stage?
Maturation
Proliferation - differentiation - morphogenesis
Osteoblasts
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

4. What are the clinical ramifications of enamel pearl?
8th week
May be confused as calculus deposit on root
Initiation stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

5. What happens during initiation?
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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Sphere of enamel on root
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

6. What type of tissue is enamel?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Common with permanent maxillary molars
Development of one or more extra teeth
Epithelial

7. What is the cap in the cap stage?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

8. How is the reduced enamel epithelium created?
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
Absence of single or multiple teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ is compressed

9. What do the odontoblasts do?
Cementoid
The cementum - PDL - and alveolar bone
Hereditary in localized form. endocrine dysfunction is complete
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

10. What are entrapped cementoblasts called?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Cementocytes
Maturation
The outer cells of the dental papilla and the central cells of the dental papilla

11. What are the clinical ramifications of micro/macrodontia?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Commonly involves permanent maxillary lateral incisor and 3rd molars
Tooth germ tries to divide
6th to 7th weeks

12. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Induction - proliferation
Dental tissues secreted as matrix in successive layers.
There is unequal growth in different parts of the tooth bud
The basement membrane

13. What are the mature cells for alveolar bone?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Osteocytes
Induction
Development of one or more extra teeth

14. What are the mature cells for dentin?
Differentiation
In the cap stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Only dentinal tubules with processes

15. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Ameloblasts
The ectomesenchyme
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

16. Active eruption
The actual vertical movement of the tooth
Dens in dente - gemination - tubercle - and fusion
Dentin secreting cells (odontoblats)
Traumatic injury or crowding of teeth

17. When does macro/microdontia occur?
Dens in dente - gemination - tubercle - and fusion
Bud stage
Cementocytes
Arrest and reversal lines

18. What is the main process involved in initiation?
Induction
Initiation stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Morphogenesis

19. Tooth development
A bilayer rim that consists only IEE and OEE
Displacement of ameloblasts to root surface
Cementocytes
Odontogenesis

20. What happens during the bell stage?
The ectomesenchyme - which was influenced by the neural crest cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Union of root structure of two or more teeth by cementum

21. What is another name for the dental sac?
Absence of single or multiple teeth
Bud stage
Compressed layer of flat to cuboidal cells
Dental follicle

22. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ectomesenchyme
Dentin and alveolar bone
The enamel organ is compressed

23. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Arrest and reversal lines
Morphogenesis
There is unequal growth in different parts of the tooth bud

24. What stage does the dental tissues subsequently fully mineralize
The cervical loop
Absence of single or multiple teeth
Maturation
Proliferation

25. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Abnormally large teeth
Only dentinal tubules with processes

26. Where is the dental sac originally derived from?
Induction
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ectomesenchyme
Oral epithelium

27. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The actual vertical movement of the tooth
The apposition of the enamel matrix
Osteocytes

28. What are the incremental lines for cementum and alveolar bone?
Outer
Cuboidal cells
Odontoblastic process
Arrest and reversal lines

29. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
In the cap stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The bud stage
Differentiation - proliferation - morphogenesis

30. What are the incremental lines for enamel?
The enamel organ is compressed
Dental papilla
There are none - they are lost with eruption
Lines of Retzuis

31. What stage does anodontia occur?
Lines of Retzuis
The cementum - PDL - and alveolar bone
Initiation stage
The cervical loop

32. What are the clinical ramifications of concrescence?
Cementocytes
Initiation stage
Common with permanent maxillary molars
During the cap stage

33. What is concrescence?
Cementocytes
Compressed layer of flat to cuboidal cells
Union of root structure of two or more teeth by cementum
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

34. Where does the primordium of the permanent dentition develop?
Common with permanent maxillary molars
Odontogenesis
The cementum - PDL - and alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

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

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36. What is enamel dysplasia?
The apposition of the enamel matrix
Faulty development of enamel from interference involving ameloblasts
Osteoblasts
Enamel organ invaginates into the dental papilla

37. What is the site for the future dentioenamel junction?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The basement membrane that seperates the enamel organ and dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Outer

38. What are the etiological factors for fusion?
There are none - they are lost with eruption
Enamel pearl - enamel dysplasia - and concresence
Pressure on the area
Morphogenesis

39. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Dentin and alveolar bone
Tooth germ
Hereditary
Pressure on the area

40. What are the etiological factors for micro/macrodontia?
Differentiation - proliferation - morphogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface
Hereditary in localized form. endocrine dysfunction is complete
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

41. What are the etiological factors for supernumerary teeth?
Displacement of ameloblasts to root surface
Enamel pearl - enamel dysplasia - and concresence
Hereditary
Common with permanent maxillary molars

42. What are the clinical ramifications of enamel dysplasia?
Outer
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
4 types
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

43. What are the etiological factors of tubercle?
Common on permanent molars or cingulum of anterior teeth
Union of root structure of two or more teeth by cementum
The bud stage
Trauma - pressure or metabolic disease

44. What will the dental sac give rise to?
Bud stage
The cementum - PDL - and alveolar bone
Abnormally small teeth
Traumatic injury or crowding of teeth

45. The stellate reticulum is located inner or outer?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Outer
Alveolar bone
Bud stage

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
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The basement membrane
Proliferation - differentiation - morphogenesis

47. 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
Development of one or more extra teeth
Odontoblasts
When the gingiva recedes and no actual tooth movement takes place

48. What is macrodontia?
The enamel organ - dental papilla - dental sac
Alveolar bone
Odontoblastic process
Abnormally large teeth

49. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The actual vertical movement of the tooth
Dental papilla
Faulty development of enamel from interference involving ameloblasts

50. What are the clinical ramifications of gemination?

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