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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 are the clinical ramifications of concrescence?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Common with permanent maxillary molars
Hereditary
Cementoid

2. What stage does anodontia occur?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Only dentinal tubules with processes
Initiation stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

3. What are the developmental disturbances of the cap stage?
Union of 2 adjacent tooth germs
Dens in dente - gemination - tubercle - and fusion
Abnormally large teeth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

4. What is the main process involved in the bud stage?
4 types
The permanent molars
Proliferation
Dental follicle

5. What happens during the bell stage?
The enamel - dentin - and cementum are secreted in successive layers
Ameloblasts
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The outer enamel epithelium

6. What is the embryological background for enamel?
Enamel organ
Trauma - pressure or metabolic disease
Maturation
Odontoblasts

7. What type of tissue is enamel?
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
Epithelial
Bud stage
Arrest and reversal lines

8. What are the incremental lines for cementum and alveolar bone?
Proliferation - differentiation - morphogenesis
Epithelial
Epithelial rests of Malassez
Arrest and reversal lines

9. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
The basement membrane
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
When the gingiva recedes and no actual tooth movement takes place

10. What will the outer cells of the dental lamina differentiate into?
The actual vertical movement of the tooth
Dentin secreting cells (odontoblats)
A bilayer rim that consists only IEE and OEE
Displacement of ameloblasts to root surface

11. What are the etiological factors for dens in dente and gemination?
Enamel organ invaginates into the dental papilla
Tooth germ tries to divide
Epithelial
Hereditary

12. What hard tissue is can not have tissue formation after eruption?
Odontoblastic process
Enamel
9th to 10th weeks
Cementoblasts

13. What is cementogenisis?
Outer
Apposition of the cementum
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
9th to 10th weeks

14. What are the formative cells for dentin?
The stellate reticulum
Odontoblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Cuboidal cells

15. What are the cell layers found in the enamel organ in the bell stage?
Trauma - pressure or metabolic disease
Initiation
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Into odontoblasts

16. What happens during initiation?
Dental tissues fully mineralize to their mature levels.
The ectomesenchyme
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
6th to 7th weeks

17. What are the clinical ramifications of anodontia?
Extra cusp due to effects on enamel organ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dentin secreting cells (odontoblats)

18. What is gemination?
The enamel organ - dental papilla - dental sac
Epithelial rests of Malassez
Cementoid
Tooth germ tries to divide

19. What processes are involved in the bell stage?
Common with permanent maxillary molars
Differentiation - proliferation - morphogenesis
Tall columnar cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

20. 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
There is unequal growth in different parts of the tooth bud
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Epithelial

21. What is the structure responsible for root development?
The cervical loop
Osteoblasts
The apposition of the enamel matrix
Hereditary

22. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Trauma - pressure or metabolic disease
Odontogenesis
The ameloblasts
Into odontoblasts

23. What layer serves as protection for the enamel organ?
Outer
Dental papilla
Tooth germ
The outer enamel epithelium

24. What are entrapped cementoblasts called?
Tall columnar cells
Osteocytes
Cementocytes
Enamel organ

25. What is amelogenisis?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The apposition of the enamel matrix
Odontoblasts

26. What is another name for the dental sac?
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
Dental follicle
Maturation
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

27. What is the time span for the bell stage?
Initiation
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
11th to 12th weeks
The bud stage

28. What are the clinical ramifications of fusion?
The outer cells of the dental papilla and the central cells of the dental papilla
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
In the cap stage

29. What is dens in dente?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Enamel organ invaginates into the dental papilla
Proliferation
Cementoblasts

30. Where is the dental sac originally derived from?
Displacement of ameloblasts to root surface
The primordium of the pulp
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ectomesenchyme

31. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Epithelial
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary in localized form. endocrine dysfunction is complete
The bud stage

32. What is concrescence?
Union of root structure of two or more teeth by cementum
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.
There is unequal growth in different parts of the tooth bud
The ectoderm

33. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Hereditary
Extra cusp due to effects on enamel organ
Odontoblastic process
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

34. When does the process of root development take place?
Sphere of enamel on root
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Enamel organ invaginates into the dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

35. What hard tissue has vascularity?
Alveolar bone
Displacement of ameloblasts to root surface
Future dentin and pulp tissue
Cementocytes

36. What is the process involved in the maturation stage?
The primordium of the pulp
Preameloblasts
Faulty development of enamel from interference involving ameloblasts
Maturation

37. What are the processes involved in the cap stage?
Hereditary
Trauma - pressure or metabolic disease
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Proliferation - differentiation - morphogenesis

38. What are the clinical ramifications of enamel pearl?
The cementum - PDL - and alveolar bone
Maturation
May be confused as calculus deposit on root
The enamel organ is compressed

39. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Imbrication lines of von Ebner
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
As a result of the apposition of cementum over dentin

40. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The enamel organ
Initiation
The ectomesenchyme
Odontoclasts

41. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The ameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementocytes

42. What is the time span for the cap stage?
9th to 10th weeks
Morphogenesis
Outer
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

43. What type of tissue is dentin - cementum - and alveolar bone?
Maturation
There are none - they are lost with eruption
The basement membrane
Connective

44. When does dens in dente occur?
During the cap stage
Absence of single or multiple teeth
There is unequal growth in different parts of the tooth bud
4 types

45. What wll the inner enamel epithelium differentiate into?
As a result of the apposition of cementum over dentin
Cuboidal cells
Enamel secreting cells (ameloblasts)
Enamel organ invaginates into the dental papilla

46. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
11th to 12th weeks
6th to 7th weeks
May be confused as calculus deposit on root

47. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Hereditary
Inner
The ectomesenchyme

48. What are the etiological factors for enamel pearl?
Cementoblasts
Displacement of ameloblasts to root surface
In the cap stage
Common on permanent molars or cingulum of anterior teeth

49. What hard tissue is innervated by nerves?
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.
Dentin and alveolar bone
Common on permanent molars or cingulum of anterior teeth
Proliferation

50. What are the mature cells for enamel?
Faulty development of enamel from interference involving ameloblasts
Arrest and reversal lines
Development of one or more extra teeth
There are none - they are lost with eruption