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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. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
Union of 2 adjacent tooth germs
Induction - proliferation
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

2. How many types of cells are found in the enamel organ in the bell stage?
4 types
Union of 2 adjacent tooth germs
Cementoblasts
Traumatic injury or crowding of teeth

3. What happens during the cap stage?
The ectomesenchyme - which was influenced by the neural crest cells
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
Proliferation - differentiation - morphogenesis

4. What are the clinical ramifications?
Induction - proliferation
Odontogenesis
Sphere of enamel on root
Common on permanent molars or cingulum of anterior teeth

5. What is microdontia?
Odontogenesis
The outer enamel epithelium
Abnormally small teeth
Inner

6. Passive eruption
The enamel - dentin - and cementum are secreted in successive layers
11th to 12th weeks
Induction - proliferation
When the gingiva recedes and no actual tooth movement takes place

7. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
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
Absence of single or multiple teeth
11th to 12th weeks
Cementoblasts

8. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
The ectomesenchyme
Odontoblasts
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.

9. What are the etiological factors for fusion?
Pressure on the area
The basement membrane
The stellate reticulum
Cementocytes

10. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
As a result of the apposition of cementum over dentin
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

11. What is cementogenisis?
Abnormally small teeth
Apposition of the cementum
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 tooth germ

12. What are supernumerary teeth?
Displacement of ameloblasts to root surface
Cementocytes
Development of one or more extra teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

13. When does the process of root development take place?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Enamel organ
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dental papilla

14. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Dental tissues fully mineralize to their mature levels.
Imbrication lines of von Ebner
Odontoclasts
Connective

15. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Dental papilla
Epithelial rests of Malassez
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
Dentin and alveolar bone

16. What are the clinical ramifications of gemination?

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17. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
The enamel organ
May be confused as calculus deposit on root
The ectomesenchyme - which was influenced by the neural crest cells

18. What is the predominate process in the bell stage?
Tooth germ tries to divide
Bud stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation

19. What is the function of the Hertwig's epithelial root sheath?
Only dentinal tubules with processes
The ectomesenchyme - which was influenced by the neural crest cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

20. Active eruption
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The permanent molars
The actual vertical movement of the tooth
Local or systemic or hereditary

21. What is the time span for the cap stage?
Differentiation
Enamel pearl - enamel dysplasia - and concresence
The actual vertical movement of the tooth
9th to 10th weeks

22. Which teeth are nonsuccedaneous?
Abnormally small teeth
Induction - proliferation
Sphere of enamel on root
The permanent molars

23. What hard tissue is can not have tissue formation after eruption?
Enamel
Enamel organ invaginates into the dental papilla
The tooth germ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

24. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Bud stage
The cervical loop
During the cap stage

25. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
When the gingiva recedes and no actual tooth movement takes place
9th to 10th weeks
8th week

26. What are the formative cells for dentin?
The tooth germ
The ectoderm
Traumatic injury or crowding of teeth
Odontoblasts

27. What happens during the bud stage?
Abnormally large teeth
Dentin and alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
As a result of the apposition of cementum over dentin

28. What are succedaneous teeth?
Pressure on the area
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Epithelial rests of Malassez
It disintegrates as the developing oral mucosa comes to line the oral cavity

29. What are the etiological factors for anodontia?
Inner
In the cap stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
9th to 10th weeks

30. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Epithelial rests of Malassez
Common with permanent maxillary molars
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

31. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Tall columnar cells
The bud stage
Induction - proliferation
Enamel organ invaginates into the dental papilla

32. The preameloblasts induce dental papilla cells to differentiate into what?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The enamel - dentin - and cementum are secreted in successive layers
Into odontoblasts
Dental papilla

33. What are the odontoblastic processes is contained in what?
Faulty development of enamel from interference involving ameloblasts
A mineralized cylinder - the dentinal tubule
9th to 10th weeks
Abnormally small teeth

34. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
The cervical loop
11th to 12th weeks
The primordium of the pulp

35. Where is the dental sac originally derived from?
Cuboidal cells
Absence of single or multiple teeth
Traumatic injury or crowding of teeth
The ectomesenchyme

36. Tooth development
The enamel organ is compressed
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontogenesis

37. What are the etiological factors of tubercle?
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
Enamel organ
Trauma - pressure or metabolic disease

38. What kind of cells occur in the outer enamel epithelium in the bell stage?
Apposition of the cementum
Cuboidal cells
Morphogenesis
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

39. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
When the gingiva recedes and no actual tooth movement takes place
The enamel organ - dental papilla - dental sac
Union of 2 adjacent tooth germs

40. What processes are involved in the bell stage?
A bilayer rim that consists only IEE and OEE
Differentiation - proliferation - morphogenesis
Cementocytes
Pressure on the area

41. What is dens in dente?
8th week
Enamel organ invaginates into the dental papilla
Tall columnar cells
The permanent molars

42. What are the etiological factors for dens in dente and gemination?
The tooth germ
Hereditary
The ectomesenchyme
Proliferation

43. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
It disintegrates as the developing oral mucosa comes to line the oral cavity
Into odontoblasts
Induction - proliferation

44. What stage does the dental tissues subsequently fully mineralize
When the gingiva recedes and no actual tooth movement takes place
Maturation
4 types
The ectomesenchyme

45. What is an enamel pearl?
Sphere of enamel on root
Enamel pearl - enamel dysplasia - and concresence
The dental sac
Lines of Retzuis

46. What are the clinical ramifications of enamel pearl?
Tooth germ
There is unequal growth in different parts of the tooth bud
Tooth germ tries to divide
May be confused as calculus deposit on root

47. When does macro/microdontia occur?
Future dentin and pulp tissue
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Bud stage
Differentiation - proliferation - morphogenesis

48. What will the inner cells of the dental lamina differentiates into?
Dental follicle
The ectomesenchyme - which was influenced by the neural crest cells
Enamel organ
The primordium of the pulp

49. What are the etiological factors of concrescence?
The outer cells of the dental papilla and the central cells of the dental papilla
The actual vertical movement of the tooth
The ectomesenchyme - which was influenced by the neural crest cells
Traumatic injury or crowding of teeth

50. What are the incremental lines for dentin?
Preameloblasts
The outer enamel epithelium
Maturation
Imbrication lines of von Ebner