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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 odontoblastic processes is contained in what?
A mineralized cylinder - the dentinal tubule
11th to 12th weeks
Local or systemic or hereditary
In the cap stage

2. What are the mature cells for dentin?
A mineralized cylinder - the dentinal tubule
The cementum - PDL - and alveolar bone
Only dentinal tubules with processes
The ectomesenchyme

3. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Morphogenesis
Differentiation

4. What are the developmental disturbances of the cap stage?
Alveolar bone
Dens in dente - gemination - tubercle - and fusion
Cementoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

5. Where is the dental sac originally derived from?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
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
The ectomesenchyme

6. What is the embryological background for dentin - cementum and alveolar bone?
Union of root structure of two or more teeth by cementum
Dental papilla
6th to 7th weeks
The ameloblasts place an acellular dental cuticle on the new enamel surface

7. What are the incremental lines for enamel?
The ectomesenchyme
Lines of Retzuis
The enamel organ is compressed
Enamel organ

8. What is the primordium of the tooth?
Differentiation
The dental sac
Osteocytes
The tooth germ

9. What hard tissue is can not have tissue formation after eruption?
9th to 10th weeks
Abnormally large teeth
Enamel
Future dentin and pulp tissue

10. What are the etiological factors for enamel pearl?
Abnormally large teeth
The actual vertical movement of the tooth
The outer enamel epithelium
Displacement of ameloblasts to root surface

11. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
The enamel - dentin - and cementum are secreted in successive layers
Absence of single or multiple teeth
Cementoblasts

12. What are supernumerary teeth?
Odontoblasts
Cuboidal cells
The cervical loop
Development of one or more extra teeth

13. When does dens in dente occur?
During the cap stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Into odontoblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

14. What will the outer cells of the dental lamina differentiate into?
Future dentin and pulp tissue
Trauma - pressure or metabolic disease
The dental sac
Dentin secreting cells (odontoblats)

15. What is enamel dysplasia?
Trauma - pressure or metabolic disease
Faulty development of enamel from interference involving ameloblasts
The basement membrane
Dentin and alveolar bone

16. What are the processes involved in the cap stage?
Odontogenesis
Preameloblasts
Enamel
Proliferation - differentiation - morphogenesis

17. Where does the primordium of the permanent dentition develop?
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

18. How many types of cells are found in the enamel organ in the bell stage?
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 types
Common with permanent maxillary molars
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

19. What are the etiological factors for supernumerary teeth?
Osteoblasts
Union of root structure of two or more teeth by cementum
Hereditary
11th to 12th weeks

20. 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 ectomesenchyme
Local or systemic or hereditary
Enamel secreting cells (ameloblasts)

21. What are the formative cells for alveolar bone?
Faulty development of enamel from interference involving ameloblasts
Ameloblasts
Osteoblasts
Abnormally large teeth

22. What are the clinical ramifications of fusion?
9th to 10th weeks
Induction - proliferation
Tooth germ tries to divide
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

23. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Commonly involves permanent maxillary lateral incisor and 3rd molars
The enamel organ
The enamel organ is compressed

24. What is the predominate process of the cap stage?
Tall columnar cells
Morphogenesis
Apposition of the cementum
When the gingiva recedes and no actual tooth movement takes place

25. What is dens in dente?
Dens in dente - gemination - tubercle - and fusion
Enamel
Enamel organ invaginates into the dental papilla
Dental follicle

26. What is the time span for the bud stage?
Oral epithelium
Differentiation - proliferation - morphogenesis
8th week
Induction

27. The oral epithelium is induced by the ectomesenchyme to produce what?
Proliferation
The dental lamina
Tall columnar cells
The actual vertical movement of the tooth

28. When does the tooth bud become a tooth germ?
In the cap stage
Dental tissues fully mineralize to their mature levels.
Traumatic injury or crowding of teeth
Dental papilla

29. What are the clinical ramifications of concrescence?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Common with permanent maxillary molars
The dental lamina
Cuboidal cells

30. What is the outer portion of the ectoderm in the initiation stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The outer enamel epithelium
Hereditary
Oral epithelium

31. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel
Abnormally small teeth

32. What is the time span for the bell stage?
Hereditary
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
Connective

33. What processes are involved with the apposition stage?
Into odontoblasts
Induction - proliferation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The ameloblasts place an acellular dental cuticle on the new enamel surface

34. What is macrodontia?
Dental tissues secreted as matrix in successive layers.
Extra cusp due to effects on enamel organ
Future dentin and pulp tissue
Abnormally large teeth

35. What are the clinical ramifications of enamel pearl?
The dental sac
The enamel - dentin - and cementum are secreted in successive layers
Commonly involves permanent maxillary lateral incisor and 3rd molars
May be confused as calculus deposit on root

36. What happens during the bell stage?
6th to 7th weeks
Maturation
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

37. What happens during the apposition stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
A bilayer rim that consists only IEE and OEE
Dentin secreting cells (odontoblats)
Dental tissues secreted as matrix in successive layers.

38. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Imbrication lines of von Ebner
Pressure on the area
The cervical loop

39. When does the process of root development take place?
In the cap stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The bud stage
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

40. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Maturation
Dental papilla
Local or systemic or hereditary
Traumatic injury or crowding of teeth

41. What are the formative cells for enamel?
Ameloblasts
Enamel pearl - enamel dysplasia - and concresence
The actual vertical movement of the tooth
Development of one or more extra teeth

42. What stage does the dental tissues subsequently fully mineralize
Alveolar bone
Cementoblasts
Maturation
The cementum - PDL - and alveolar bone

43. What kind of cells reside in the stratum intermediate?
Hereditary
Commonly involves permanent maxillary lateral incisor and 3rd molars
The ameloblasts place an acellular dental cuticle on the new enamel surface
Compressed layer of flat to cuboidal cells

44. What is the structure responsible for root development?
Proliferation - differentiation - morphogenesis
May be confused as calculus deposit on root
The cervical loop
Imbrication lines of von Ebner

45. What is amelogenisis?
Enamel organ invaginates into the dental papilla
The apposition of the enamel matrix
Cuboidal cells
Proliferation

46. What are the etiological factors for micro/macrodontia?
11th to 12th weeks
Hereditary in localized form. endocrine dysfunction is complete
Apposition of the cementum
Tooth germ tries to divide

47. Do odontoblasts start their secretion of matrix before the ameloblasts?
Tooth germ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes

48. What kind of cells occur in the outer enamel epithelium in the bell stage?
Dental tissues fully mineralize to their mature levels.
Cuboidal cells
Enamel pearl - enamel dysplasia - and concresence
The tooth germ

49. Tooth development
Epithelial rests of Malassez
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontogenesis
11th to 12th weeks

50. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Hereditary
The outer enamel epithelium
Cementoblasts
Future dentin and pulp tissue