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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 processes are involved with the apposition stage?
Displacement of ameloblasts to root surface
Induction - proliferation
9th to 10th weeks
The ectoderm

2. What is the cap in the cap stage?
The bud stage
The enamel organ
Odontoblasts
Enamel

3. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
The outer enamel epithelium
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Hereditary in localized form. endocrine dysfunction is complete

4. What are the processes involved in the cap stage?
Enamel organ
Cementoid
Proliferation - differentiation - morphogenesis
Oral epithelium

5. What are the clinical ramifications of dens in dente?
8th week
Induction - proliferation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The basement membrane

6. What is the structure responsible for root development?
Traumatic injury or crowding of teeth
The bud stage
Dentin and alveolar bone
The cervical loop

7. What are the clinical ramifications of anodontia?
The cervical loop
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
During the cap stage
The enamel organ - dental papilla - dental sac

8. Active eruption
Differentiation
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane
The actual vertical movement of the tooth

9. What happens during the cap stage?
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.
Tooth germ
When the gingiva recedes and no actual tooth movement takes place
Pressure on the area

10. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Induction - proliferation
Only dentinal tubules with processes
Apposition of the cementum

11. When does the tooth bud become a tooth germ?
Into odontoblasts
Initiation stage
Proliferation
In the cap stage

12. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Future dentin and pulp tissue
Common with permanent maxillary molars
The outer cells of the dental papilla and the central cells of the dental papilla
Preameloblasts

13. What will the inner cells of the dental lamina differentiates into?
Dens in dente - gemination - tubercle - and fusion
Connective
Cementocytes
The primordium of the pulp

14. The preameloblasts induce dental papilla cells to differentiate into what?
The tooth germ
Into odontoblasts
Morphogenesis
The primordium of the pulp

15. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
A bilayer rim that consists only IEE and OEE
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Odontoclasts
Tall columnar cells

16. What is the main process involved in initiation?
Alveolar bone
Induction
During the cap stage
The permanent molars

17. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Enamel
Enamel organ invaginates into the dental papilla
The basement membrane
Outer

18. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ
Initiation stage
Dental papilla

19. What are the etiological factors of concrescence?
Initiation
Traumatic injury or crowding of teeth
The basement membrane that seperates the enamel organ and dental papilla
Pressure on the area

20. What are the incremental lines for dentin?
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
Imbrication lines of von Ebner
Common with permanent maxillary molars
Dental tissues fully mineralize to their mature levels.

21. How is the reduced enamel epithelium created?
Oral epithelium
Morphogenesis
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ is compressed

22. What is amelogenisis?
Epithelial rests of Malassez
Epithelial
4 types
The apposition of the enamel matrix

23. What are the clinical ramifications of enamel dysplasia?
Enamel organ
Imbrication lines of von Ebner
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementoid

24. Which teeth are nonsuccedaneous?
Maturation
Development of one or more extra teeth
Initiation stage
The permanent molars

25. What stage does the dental tissues subsequently fully mineralize
Dental tissues secreted as matrix in successive layers.
Only dentinal tubules with processes
Dens in dente - gemination - tubercle - and fusion
Maturation

26. What are the etiological factors of tubercle?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Trauma - pressure or metabolic disease
11th to 12th weeks
The outer cells of the dental papilla and the central cells of the dental papilla

27. Where does the primordium of the permanent dentition develop?
The ectomesenchyme
During the cap stage
Enamel secreting cells (ameloblasts)
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

28. What is anodontia?
Epithelial rests of Malassez
Osteoblasts
Common on permanent molars or cingulum of anterior teeth
Absence of single or multiple teeth

29. What are the etiological factors of enamel dysplasia?
Abnormally large teeth
Ameloblasts
Local or systemic or hereditary
Enamel organ invaginates into the dental papilla

30. What happens during initiation?
Cementoblasts
The enamel organ is compressed
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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

31. What hard tissue has vascularity?
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Alveolar bone

32. What stage does anodontia occur?
Dental papilla
Enamel pearl - enamel dysplasia - and concresence
Initiation stage
Enamel secreting cells (ameloblasts)

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

34. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Inner
Sphere of enamel on root
Hereditary

35. What do the odontoblasts do?
Differentiation - proliferation - morphogenesis
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
When the gingiva recedes and no actual tooth movement takes place

36. What is microdontia?
Outer
As a result of the apposition of cementum over dentin
Abnormally small teeth
May be confused as calculus deposit on root

37. The oral epithelium is induced by the ectomesenchyme to produce what?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental papilla
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The dental lamina

38. What are the formative cells for cementum?
Hereditary
The dental sac
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Cementoblasts

39. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Odontoblastic process
Outer
The cementum - PDL - and alveolar bone

40. What are the etiological factors for micro/macrodontia?
Dental follicle
Hereditary in localized form. endocrine dysfunction is complete
Inner
As a result of the apposition of cementum over dentin

41. What are the mature cells for alveolar bone?
Osteocytes
Osteoblasts
The enamel - dentin - and cementum are secreted in successive layers
Only dentinal tubules with processes

42. What is macrodontia?
Cementocytes
Enamel
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.
Abnormally large teeth

43. What is the process involved in the maturation stage?
11th to 12th weeks
Dental tissues fully mineralize to their mature levels.
Proliferation
Maturation

44. What are the etiological factors for anodontia?
The outer enamel epithelium
The enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementocytes

45. What happens during the maturation stage?
Enamel secreting cells (ameloblasts)
Trauma - pressure or metabolic disease
Common on permanent molars or cingulum of anterior teeth
Dental tissues fully mineralize to their mature levels.

46. Passive eruption
Commonly involves permanent maxillary lateral incisor and 3rd molars
Outer
When the gingiva recedes and no actual tooth movement takes place
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

47. What is concrescence?
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
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectoderm
Union of root structure of two or more teeth by cementum

48. What is the predominate process of the cap stage?
Hereditary in localized form. endocrine dysfunction is complete
The ectomesenchyme
Sphere of enamel on root
Morphogenesis

49. What layer serves as protection for the enamel organ?
Trauma - pressure or metabolic disease
The outer enamel epithelium
Hereditary
The primordium of the pulp

50. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
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
Cementoid
Future dentin and pulp tissue