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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 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Dental tissues fully mineralize to their mature levels.
The bud stage
Dental papilla

2. What are the formative cells for enamel?
Common on permanent molars or cingulum of anterior teeth
Ameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The enamel - dentin - and cementum are secreted in successive layers

3. What stage does the dental tissues subsequently fully mineralize
Epithelial rests of Malassez
Preameloblasts
The enamel organ
Maturation

4. What is the time span for the cap stage?
9th to 10th weeks
Differentiation
Dental follicle
Dental tissues fully mineralize to their mature levels.

5. What are the etiological factors for supernumerary teeth?
The ectomesenchyme
Hereditary
Into odontoblasts
May be confused as calculus deposit on root

6. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The cementum - PDL - and alveolar bone
The ameloblasts
Cuboidal cells

7. The stellate reticulum is located inner or outer?
As a result of the apposition of cementum over dentin
Outer
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Abnormally large teeth

8. What is dens in dente?
Dental papilla
Bud stage
The dental lamina
Enamel organ invaginates into the dental papilla

9. What is fusion?
Dental tissues secreted as matrix in successive layers.
Absence of single or multiple teeth
Hereditary in localized form. endocrine dysfunction is complete
Union of 2 adjacent tooth germs

10. What is the outer portion of the ectoderm in the initiation stage?
The outer enamel epithelium
Oral epithelium
Odontoblastic process
The ectomesenchyme

11. How is the reduced enamel epithelium created?
Traumatic injury or crowding of teeth
Lines of Retzuis
Dental follicle
The enamel organ is compressed

12. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Initiation stage
The outer enamel epithelium
Imbrication lines of von Ebner

13. What are the development disturbances of the apposition and maturation stages?
The ectomesenchyme - which was influenced by the neural crest cells
Enamel pearl - enamel dysplasia - and concresence
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
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

14. What is macrodontia?
The dental lamina
Cementoblasts
Abnormally large teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

15. Passive eruption
The cervical loop
Bud stage
During the cap stage
When the gingiva recedes and no actual tooth movement takes place

16. Where does the primordium of the permanent dentition develop?
Bud stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental tissues fully mineralize to their mature levels.
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

17. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Faulty development of enamel from interference involving ameloblasts
The basement membrane
Odontogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface

18. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Apposition of the cementum
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Tooth germ

19. How many types of cells are found in the enamel organ in the bell stage?
Lines of Retzuis
The dental sac
4 types
A mineralized cylinder - the dentinal tubule

20. What are the mature cells for cementum?
Cementocytes
Traumatic injury or crowding of teeth
The enamel organ - dental papilla - dental sac
Enamel

21. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Connective
Cementoid
Maturation

22. What stage does supernumerary teeth occur?
The permanent molars
Initiation
Apposition of the cementum
There are none - they are lost with eruption

23. Which teeth are nonsuccedaneous?
As a result of the apposition of cementum over dentin
Abnormally small teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The permanent molars

24. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The permanent molars
Enamel
Absence of single or multiple teeth

25. What kind of cells occur in the outer enamel epithelium in the bell stage?
The permanent molars
Outer
Cuboidal cells
Proliferation - differentiation - morphogenesis

26. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Oral epithelium
The dental lamina
Tooth germ
The ectoderm

27. What is gemination?
Enamel secreting cells (ameloblasts)
Tooth germ tries to divide
9th to 10th weeks
Epithelial

28. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Outer
Proliferation - differentiation - morphogenesis
Proliferation

29. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
Cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
The enamel - dentin - and cementum are secreted in successive layers

30. What are the incremental lines for enamel?
Connective
When the gingiva recedes and no actual tooth movement takes place
Lines of Retzuis
11th to 12th weeks

31. What wll the inner enamel epithelium differentiate into?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
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
Enamel secreting cells (ameloblasts)

32. Do odontoblasts start their secretion of matrix before the ameloblasts?
The bud stage
Induction - proliferation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
It disintegrates as the developing oral mucosa comes to line the oral cavity

33. What stage does anodontia occur?
Enamel pearl - enamel dysplasia - and concresence
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Initiation stage
Lines of Retzuis

34. What is the predominate process of the cap stage?
Morphogenesis
Osteoblasts
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells

35. What are entrapped cementoblasts called?
4 types
Cementocytes
Dental papilla
Initiation stage

36. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Cementocytes
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontogenesis

37. What are the mature cells for alveolar bone?
Tall columnar cells
Cementocytes
The cementum - PDL - and alveolar bone
Osteocytes

38. What is the process involved in the maturation stage?
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
During the cap stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

39. What kind of cells occur in the inner enamel epithelium?
Common on permanent molars or cingulum of anterior teeth
Trauma - pressure or metabolic disease
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Tall columnar cells

40. What is another name for the dental sac?
Proliferation
Dental follicle
Morphogenesis
Enamel

41. What are the clinical ramifications of enamel dysplasia?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
There are none - they are lost with eruption
The ectoderm
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

42. What do the odontoblasts do?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The cervical loop
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The enamel organ - dental papilla - dental sac

43. What are the etiological factors of enamel dysplasia?
Tooth germ tries to divide
The stellate reticulum
It disintegrates as the developing oral mucosa comes to line the oral cavity
Local or systemic or hereditary

44. What are the developmental disturbances of the cap stage?
Displacement of ameloblasts to root surface
Imbrication lines of von Ebner
A mineralized cylinder - the dentinal tubule
Dens in dente - gemination - tubercle - and fusion

45. What is the primordium of the tooth?
The enamel organ
Proliferation - differentiation - morphogenesis
The tooth germ
Traumatic injury or crowding of teeth

46. 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
The tooth germ
Cementocytes
Displacement of ameloblasts to root surface

47. What happens during the cap stage?
Common with permanent maxillary molars
The basement membrane
Epithelial rests of Malassez
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.

48. What does the cervical loop consist of?
The basement membrane
A bilayer rim that consists only IEE and OEE
Maturation
The bud stage

49. What are the etiological factors of tubercle?
Future dentin and pulp tissue
Trauma - pressure or metabolic disease
Odontoclasts
8th week

50. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
4 types
Dental tissues fully mineralize to their mature levels.
11th to 12th weeks