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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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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is enamel dysplasia?
Hereditary
Faulty development of enamel from interference involving ameloblasts
Ameloblasts
Tooth germ

2. What is the primordium of the tooth?
The stellate reticulum
Hereditary
Imbrication lines of von Ebner
The tooth germ

3. What is an enamel pearl?
There are none - they are lost with eruption
Sphere of enamel on root
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Dens in dente - gemination - tubercle - and fusion

4. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Local or systemic or hereditary
Cementoblasts
The enamel organ - dental papilla - dental sac
Cementocytes

5. What are the etiological factors for supernumerary teeth?
Dental follicle
Hereditary
Cementoblasts
4 types

6. What kind of cells occur in the outer enamel epithelium in the bell stage?
In the cap stage
Odontoblastic process
Cementoid
Cuboidal cells

7. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental follicle
Absence of single or multiple teeth

8. What are the etiological factors for anodontia?
Pressure on the area
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Union of 2 adjacent tooth germs
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. The preameloblasts induce dental papilla cells to differentiate into what?
The ectomesenchyme - which was influenced by the neural crest cells
Cementoblasts
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Into odontoblasts

10. What are the etiological factors of tubercle?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Abnormally large teeth
Trauma - pressure or metabolic disease
Dens in dente - gemination - tubercle - and fusion

11. What will the outer cells of the dental lamina differentiate into?
Apposition of the cementum
Hereditary in localized form. endocrine dysfunction is complete
Dentin secreting cells (odontoblats)
Induction - proliferation

12. What is the process involved in the maturation stage?
Initiation stage
Enamel secreting cells (ameloblasts)
Odontoblasts
Maturation

13. What does the cervical loop consist of?
Pressure on the area
Cementoid
A bilayer rim that consists only IEE and OEE
Dental tissues secreted as matrix in successive layers.

14. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
During the cap stage
The outer enamel epithelium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

15. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Compressed layer of flat to cuboidal cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
There is unequal growth in different parts of the tooth bud

16. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Local or systemic or hereditary

17. What are the mature cells for 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
Dentin and alveolar bone
Cementocytes
Tooth germ tries to divide

18. What are the formative cells for cementum?
Dentin and alveolar bone
Maturation
Proliferation - differentiation - morphogenesis
Cementoblasts

19. What are the etiological factors for enamel pearl?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Into odontoblasts
The ectomesenchyme
Displacement of ameloblasts to root surface

20. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
In the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

21. What happens during the bell stage?
The permanent molars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The dental lamina
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

22. 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
Union of root structure of two or more teeth by cementum
Apposition of the cementum
Cementoblasts

23. What hard tissue is innervated by nerves?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dentin and alveolar bone
Only dentinal tubules with processes
Epithelial rests of Malassez

24. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
Bud stage
Odontoblastic process
Maturation

25. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Epithelial
The basement membrane that seperates the enamel organ and dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity

26. What is the predominate process of the cap stage?
Cuboidal cells
Morphogenesis
Into odontoblasts
As a result of the apposition of cementum over dentin

27. What happens during the bud stage?
The basement membrane that seperates the enamel organ and dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Abnormally small teeth
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

28. What stage does the dental tissues subsequently fully mineralize
Osteocytes
The dental lamina
Hereditary in localized form. endocrine dysfunction is complete
Maturation

29. What are the clinical ramifications of micro/macrodontia?
Differentiation
Commonly involves permanent maxillary lateral incisor and 3rd molars
Bud stage
Oral epithelium

30. The stratum intermediate is located inner or outer?
Common on permanent molars or cingulum of anterior teeth
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Inner
The enamel organ

31. What stage does supernumerary teeth occur?
There are none - they are lost with eruption
Initiation
Tooth germ tries to divide
The outer cells of the dental papilla and the central cells of the dental papilla

32. What is the time span for the bell stage?
11th to 12th weeks
Commonly involves permanent maxillary lateral incisor and 3rd molars
The primordium of the pulp
Differentiation

33. What kind of cells occur in the inner enamel epithelium?
Tall columnar cells
Traumatic injury or crowding of teeth
The outer cells of the dental papilla and the central cells of the dental papilla
Cementoid

34. Active eruption
Cuboidal cells
Union of root structure of two or more teeth by cementum
The actual vertical movement of the tooth
Apposition of the cementum

35. What is gemination?
Faulty development of enamel from interference involving ameloblasts
Epithelial
Sphere of enamel on root
Tooth germ tries to divide

36. What are the clinical ramifications of anodontia?
Enamel pearl - enamel dysplasia - and concresence
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Hereditary

37. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
4 types
Into odontoblasts

38. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Abnormally large teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Future dentin and pulp tissue

39. Which teeth are nonsuccedaneous?
Imbrication lines of von Ebner
Odontoblastic process
A mineralized cylinder - the dentinal tubule
The permanent molars

40. What is the main process involved in initiation?
Induction
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
A mineralized cylinder - the dentinal tubule
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

41. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Hereditary in localized form. endocrine dysfunction is complete
Tooth germ
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

42. What kind of cells reside in the stratum intermediate?
Common on permanent molars or cingulum of anterior teeth
Displacement of ameloblasts to root surface
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Compressed layer of flat to cuboidal cells

43. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Enamel
The basement membrane
A mineralized cylinder - the dentinal tubule
Development of one or more extra teeth

44. What are supernumerary teeth?
Development of one or more extra teeth
The enamel organ is compressed
Arrest and reversal lines
8th week

45. What is anodontia?
Ameloblasts
The actual vertical movement of the tooth
Absence of single or multiple teeth
Differentiation - proliferation - morphogenesis

46. What is dens in dente?
Compressed layer of flat to cuboidal cells
Enamel organ invaginates into the dental papilla
9th to 10th weeks
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

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

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48. What else undergoes proliferation in the bud stage besides the dental lamina?
Faulty development of enamel from interference involving ameloblasts
Odontoblastic process
The ectomesenchyme
Development of one or more extra teeth

49. What type of tissue is enamel?
The dental sac
Epithelial
Into odontoblasts
The stellate reticulum

50. What is the cap in the cap stage?
The outer enamel epithelium
Future dentin and pulp tissue
The enamel organ
Cementoblasts