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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

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Answer 50 questions in 15 minutes.
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1. What are the development disturbances of the apposition and maturation stages?
May be confused as calculus deposit on root
Initiation
Enamel pearl - enamel dysplasia - and concresence
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

2. What is the outer portion of the ectoderm in the initiation stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoblasts
Only dentinal tubules with processes
Oral epithelium

3. What are the etiological factors of tubercle?
A mineralized cylinder - the dentinal tubule
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Trauma - pressure or metabolic disease
The ectomesenchyme

4. What is cementogenisis?
Apposition of the cementum
Enamel
The dental sac
Enamel secreting cells (ameloblasts)

5. What is the time span for the cap stage?
Osteoblasts
9th to 10th weeks
Maturation
The basement membrane

6. What are the incremental lines for cementum and alveolar bone?
Proliferation
The enamel organ - dental papilla - dental sac
Arrest and reversal lines
Future dentin and pulp tissue

7. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ameloblasts
The bud stage
Tall columnar cells

8. What are the mature cells for alveolar bone?
The ectomesenchyme
Osteocytes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cervical loop

9. Where is the dental papilla originally derived from?
Outer
Pressure on the area
Odontoclasts
The ectomesenchyme - which was influenced by the neural crest cells

10. What are the formative cells for cementum?
The bud stage
Cementoblasts
Arrest and reversal lines
8th week

11. What are the etiological factors for anodontia?
The outer enamel epithelium
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoblastic process
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

12. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Initiation stage
Cementocytes
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

13. What happens during the cap stage?
Abnormally large teeth
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.
Lines of Retzuis

14. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The stellate reticulum
The basement membrane
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
The ectoderm

15. What stage does the dental tissues subsequently fully mineralize
Tooth germ tries to divide
The permanent molars
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.
Maturation

16. What hard tissue is can not have tissue formation after eruption?
The apposition of the enamel matrix
Enamel
Hereditary
The cementum - PDL - and alveolar bone

17. What are supernumerary teeth?
Odontogenesis
Proliferation
Development of one or more extra teeth
Abnormally small teeth

18. What are the cell layers found in the enamel organ in the bell stage?
Epithelial rests of Malassez
Cementocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

19. What are the clinical ramifications of dens in dente?
The cervical loop
Proliferation - differentiation - morphogenesis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectoderm

20. What else undergoes proliferation in the bud stage besides the dental lamina?
Cementoblasts
In the cap stage
The ectomesenchyme
Abnormally large teeth

21. What happens when the reduced enamel epithelium is 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
Enamel pearl - enamel dysplasia - and concresence
Dental follicle
11th to 12th weeks

22. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
During the cap stage
It disintegrates as the developing oral mucosa comes to line the oral cavity
Commonly involves permanent maxillary lateral incisor and 3rd molars

23. How many types of cells are found in the enamel organ in the bell stage?
4 types
Pressure on the area
The enamel - dentin - and cementum are secreted in successive layers
Differentiation

24. What are the mature cells for cementum?
Cementocytes
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
The ameloblasts
The basement membrane

25. What happens during the maturation stage?
Oral epithelium
Alveolar bone
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental tissues fully mineralize to their mature levels.

26. What are the clinical ramifications of gemination?

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27. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ - dental papilla - dental sac
Induction
Odontoblastic process
Tooth germ

28. What happens during the apposition stage?
Dentin secreting cells (odontoblats)
Dental tissues secreted as matrix in successive layers.
Maturation
Enamel organ invaginates into the dental papilla

29. What are the mature cells for enamel?
The tooth germ
Union of root structure of two or more teeth by cementum
Cementoid
There are none - they are lost with eruption

30. What are the clinical ramifications?
Induction
Common with permanent maxillary molars
Common on permanent molars or cingulum of anterior teeth
Enamel

31. What are the developmental disturbances of the cap stage?
Dentin secreting cells (odontoblats)
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Outer
Dens in dente - gemination - tubercle - and fusion

32. What is dens in dente?
The cementum - PDL - and alveolar bone
Maturation
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Enamel organ invaginates into the dental papilla

33. What is the main process involved in the bud stage?
Cementocytes
The permanent molars
Dentin and alveolar bone
Proliferation

34. What is the cap in the cap stage?
The stellate reticulum
The enamel organ
Initiation
May be confused as calculus deposit on root

35. What will the dental sac give rise to?
The cementum - PDL - and alveolar bone
Oral epithelium
The ameloblasts place an acellular dental cuticle on the new enamel surface
Abnormally small teeth

36. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Proliferation
Abnormally large teeth
The dental sac
Cementoblasts

37. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Initiation
When the gingiva recedes and no actual tooth movement takes place
Lines of Retzuis

38. What is the process involved in the maturation stage?
Induction - proliferation
Odontoblasts
Maturation
The ectoderm

39. Where does the primordium of the permanent dentition develop?
Union of 2 adjacent tooth germs
The bud stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

40. What do the odontoblasts do?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Odontogenesis
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

41. What type of tissue is dentin - cementum - and alveolar bone?
Odontoclasts
Outer
Connective
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

42. What does the cervical loop consist of?
Induction
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
A bilayer rim that consists only IEE and OEE
Enamel pearl - enamel dysplasia - and concresence

43. What kind of cells occur in the inner enamel epithelium?
Morphogenesis
Tall columnar cells
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent molars

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

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45. What is the primordium of the tooth?
The ectomesenchyme
The tooth germ
6th to 7th weeks
Oral epithelium

46. How is the dentinocemental junction formed?
The ectomesenchyme
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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
As a result of the apposition of cementum over dentin

47. What stage does supernumerary teeth occur?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation
The cementum - PDL - and alveolar bone
Common with permanent maxillary molars

48. What are the formative cells for enamel?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Ameloblasts
Odontoclasts
Osteoblasts

49. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The primordium of the pulp
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dental tissues fully mineralize to their mature levels.

50. What are the clinical ramifications of micro/macrodontia?
11th to 12th weeks
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
6th to 7th weeks

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Dentistry Tooth Development And Eruption

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