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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 is microdontia?
May be confused as calculus deposit on root
The basement membrane
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Abnormally small teeth

2. What are the development disturbances of the apposition and maturation stages?
Sphere of enamel on root
The dental lamina
Enamel pearl - enamel dysplasia - and concresence
The ectoderm

3. What is tubercle?
The ectoderm
May be confused as calculus deposit on root
The ectomesenchyme
Extra cusp due to effects on enamel organ

4. What do the odontoblasts do?
The permanent molars
Induction - proliferation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

5. What stage does anodontia occur?
Odontoblasts
Initiation stage
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
Extra cusp due to effects on enamel organ

6. What is anodontia?
Odontoblasts
Hereditary
Dens in dente - gemination - tubercle - and fusion
Absence of single or multiple teeth

7. What are the etiological factors for fusion?
Abnormally large teeth
Epithelial rests of Malassez
Epithelial
Pressure on the area

8. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Tooth germ
Into odontoblasts
Ameloblasts

9. What are supernumerary teeth?
Common with permanent maxillary molars
The actual vertical movement of the tooth
Development of one or more extra teeth
Compressed layer of flat to cuboidal cells

10. How many types of cells are found in the enamel organ in the bell stage?
The ameloblasts
Faulty development of enamel from interference involving ameloblasts
Union of 2 adjacent tooth germs
4 types

11. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Odontoclasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Preameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

12. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
A mineralized cylinder - the dentinal tubule
Extra cusp due to effects on enamel organ
Epithelial rests of Malassez
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

13. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Imbrication lines of von Ebner
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Induction
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

14. What happens during the appositional stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The enamel - dentin - and cementum are secreted in successive layers
The stellate reticulum

15. What is amelogenisis?
The apposition of the enamel matrix
Commonly involves permanent maxillary lateral incisor and 3rd molars
Abnormally large teeth
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

16. What are the clinical ramifications?
Compressed layer of flat to cuboidal cells
Cementocytes
Common with permanent maxillary molars
Common on permanent molars or cingulum of anterior teeth

17. What are the etiological factors for anodontia?
9th to 10th weeks
Dentin secreting cells (odontoblats)
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dental follicle

18. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Odontoclasts
Future dentin and pulp tissue

19. What are the incremental lines for enamel?
Oral epithelium
Development of one or more extra teeth
Lines of Retzuis
Ameloblasts

20. The stellate reticulum is located inner or outer?
Outer
Differentiation
Hereditary
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

21. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Compressed layer of flat to cuboidal cells
The dental sac
Hereditary
Odontoclasts

22. What are the clinical ramifications of micro/macrodontia?
Maturation
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.
The enamel organ - dental papilla - dental sac
Commonly involves permanent maxillary lateral incisor and 3rd molars

23. Tooth development
8th week
Into odontoblasts
The enamel organ
Odontogenesis

24. What are the incremental lines for cementum and alveolar bone?
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane
Arrest and reversal lines
8th week

25. What are the cell layers found in the enamel organ in the bell stage?
The dental lamina
Lines of Retzuis
The cementum - PDL - and alveolar bone
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

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

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27. What are the mature cells for alveolar bone?
Future dentin and pulp tissue
The basement membrane that seperates the enamel organ and dental papilla
Osteocytes
Hereditary in localized form. endocrine dysfunction is complete

28. What kind of cells occur in the inner enamel epithelium?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Tall columnar cells
The cervical loop
Trauma - pressure or metabolic disease

29. What happens during the bud stage?
Compressed layer of flat to cuboidal cells
Abnormally small teeth
Dental papilla
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

30. What is concrescence?
Union of root structure of two or more teeth by cementum
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
Cementoblasts

31. What is the time span for the cap stage?
9th to 10th weeks
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cementoblasts

32. Where does the primordium of the permanent dentition develop?
There are none - they are lost with eruption
As a result of the apposition of cementum over dentin
Union of 2 adjacent tooth germs
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

33. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
11th to 12th weeks
The basement membrane
The stellate reticulum
Common on permanent molars or cingulum of anterior teeth

34. What wll the inner enamel epithelium differentiate into?
The stellate reticulum
Enamel secreting cells (ameloblasts)
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoblasts

35. What is the function of the Hertwig's epithelial root sheath?
The enamel organ
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Alveolar bone

36. The preameloblasts induce dental papilla cells to differentiate into what?
The basement membrane
Dental follicle
11th to 12th weeks
Into odontoblasts

37. How is the dentinocemental junction formed?
Cementoid
As a result of the apposition of cementum over dentin
A bilayer rim that consists only IEE and OEE
The actual vertical movement of the tooth

38. What is another name for the dental sac?
Dental tissues secreted as matrix in successive layers.
Dental follicle
The enamel organ is compressed
The cervical loop

39. What are succedaneous teeth?
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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The outer enamel epithelium
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

40. What are the mature cells for cementum?
The cementum - PDL - and alveolar bone
Trauma - pressure or metabolic disease
Cementocytes
When the gingiva recedes and no actual tooth movement takes place

41. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The apposition of the enamel matrix
The permanent molars
Odontoblasts
The bud stage

42. The stratum intermediate is located inner or outer?
Future dentin and pulp tissue
Arrest and reversal lines
Inner
A bilayer rim that consists only IEE and OEE

43. What are the incremental lines for dentin?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Union of root structure of two or more teeth by cementum
11th to 12th weeks
Imbrication lines of von Ebner

44. What happens during initiation?
The enamel organ - dental papilla - dental sac
Enamel organ invaginates into the dental papilla
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
Dental papilla

45. What are the formative cells for enamel?
During the cap stage
The outer enamel epithelium
Ameloblasts
Enamel secreting cells (ameloblasts)

46. What is the time span for initiation?
Traumatic injury or crowding of teeth
Induction
6th to 7th weeks
Lines of Retzuis

47. What are the formative cells for cementum?
Cuboidal cells
Cementoblasts
Cementoid
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

48. What is the process involved in the maturation stage?
Oral epithelium
The actual vertical movement of the tooth
Maturation
Cementoblasts

49. What type of tissue is dentin - cementum - and alveolar bone?
Connective
In the cap stage
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
Common on permanent molars or cingulum of anterior teeth

50. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
11th to 12th weeks
Hereditary
May be confused as calculus deposit on root
The basement membrane