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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 are the etiological factors of enamel dysplasia?
The ectoderm
The ectomesenchyme - which was influenced by the neural crest cells
Local or systemic or hereditary
As a result of the apposition of cementum over dentin

2. What is tubercle?
Extra cusp due to effects on enamel organ
The permanent molars
Common with permanent maxillary molars
Cementoblasts

3. What is the predominate process of the cap stage?
Future dentin and pulp tissue
Cementocytes
Proliferation
Morphogenesis

4. What is the predominate process in the bell stage?
Union of root structure of two or more teeth by cementum
Differentiation
Hereditary in localized form. endocrine dysfunction is complete
Cementocytes

5. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Maturation
There are none - they are lost with eruption

6. What are the clinical ramifications of concrescence?
The enamel organ is compressed
Common with permanent maxillary molars
The enamel organ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

7. What is macrodontia?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Abnormally large teeth
Osteocytes
9th to 10th weeks

8. What are the incremental lines for cementum and alveolar bone?
The enamel - dentin - and cementum are secreted in successive layers
Arrest and reversal lines
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
Odontoclasts

9. The preameloblasts induce dental papilla cells to differentiate into what?
During the cap stage
Into odontoblasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

10. What processes are involved with the apposition stage?
Enamel secreting cells (ameloblasts)
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.
Induction - proliferation
The enamel organ - dental papilla - dental sac

11. What happens during the appositional stage?
Maturation
Oral epithelium
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 enamel - dentin - and cementum are secreted in successive layers

12. What hard tissue has vascularity?
Hereditary
Alveolar bone
Odontoclasts
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

13. What are the etiological factors for dens in dente and gemination?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Oral epithelium
Hereditary

14. Where is the dental papilla originally derived from?
Epithelial rests of Malassez
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Apposition of the cementum

15. When does macro/microdontia occur?
The cementum - PDL - and alveolar bone
The dental lamina
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Bud stage

16. Where does the primordium of the permanent dentition develop?
Dental papilla
Pressure on the area
8th week
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

17. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
The enamel - dentin - and cementum are secreted in successive layers
Dental papilla
Hereditary

18. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Displacement of ameloblasts to root surface
Local or systemic or hereditary
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

19. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Epithelial rests of Malassez
The basement membrane that seperates the enamel organ and dental papilla
Lines of Retzuis
Faulty development of enamel from interference involving ameloblasts

20. What are the clinical ramifications of supernumerary teeth?
The bud stage
In the cap stage
The basement membrane
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

21. Which teeth are nonsuccedaneous?
The enamel organ is compressed
Oral epithelium
The permanent molars
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

22. What is the time span for the bell stage?
Dental tissues secreted as matrix in successive layers.
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
11th to 12th weeks
Dens in dente - gemination - tubercle - and fusion

23. What is cementogenisis?
Apposition of the cementum
The ectomesenchyme
Dental tissues fully mineralize to their mature levels.
Outer

24. In the cap stage the tooth bud does not grow - what happens?
Induction - proliferation
The basement membrane that seperates the enamel organ and dental papilla
The dental lamina
There is unequal growth in different parts of the tooth bud

25. What are the clinical ramifications?
Hereditary in localized form. endocrine dysfunction is complete
Common on permanent molars or cingulum of anterior teeth
The basement membrane that seperates the enamel organ and dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

26. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The bud stage
Odontogenesis
Cementocytes
The basement membrane

27. What are the incremental lines for enamel?
The basement membrane
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Initiation stage
Lines of Retzuis

28. What do the odontoblasts do?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The ectoderm
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dens in dente - gemination - tubercle - and fusion

29. What is the main process involved in initiation?
Induction
Dens in dente - gemination - tubercle - and fusion
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ameloblasts place an acellular dental cuticle on the new enamel surface

30. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
The ectomesenchyme - which was influenced by the neural crest cells
Abnormally large teeth
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.

31. Where is the dental sac originally derived from?
Dentin secreting cells (odontoblats)
The ectomesenchyme
Cuboidal cells
Dental follicle

32. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ameloblasts
Dentin and alveolar bone
The enamel organ
The stellate reticulum

33. What are the formative cells for cementum?
The cervical loop
Cuboidal cells
Cementoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

34. What is the structure responsible for root development?
The cervical loop
Induction
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Enamel organ invaginates into the dental papilla

35. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Common with permanent maxillary molars
Tooth germ tries to divide

36. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
6th to 7th weeks
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dens in dente - gemination - tubercle - and fusion

37. What happens during the bell stage?
The cementum - PDL - and alveolar bone
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

38. What are the etiological factors for anodontia?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Traumatic injury or crowding of teeth
In the cap stage

39. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The ectomesenchyme
Common on permanent molars or cingulum of anterior teeth
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Tooth germ

40. What are the clinical ramifications of dens in dente?
Imbrication lines of von Ebner
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ameloblasts place an acellular dental cuticle on the new enamel surface

41. What are the etiological factors of concrescence?
Initiation
Traumatic injury or crowding of teeth
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Displacement of ameloblasts to root surface

42. What are the clinical ramifications of anodontia?
Epithelial
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Common with permanent maxillary molars
The enamel organ - dental papilla - dental sac

43. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
11th to 12th weeks
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Maturation

44. What happens during initiation?
The apposition of the enamel matrix
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
Osteocytes
Development of one or more extra teeth

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

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46. Active eruption
Dentin secreting cells (odontoblats)
It disintegrates as the developing oral mucosa comes to line the oral cavity
The actual vertical movement of the tooth
Commonly involves permanent maxillary lateral incisor and 3rd molars

47. What is the process involved in the maturation stage?
Differentiation
The ectomesenchyme
Compressed layer of flat to cuboidal cells
Maturation

48. What is anodontia?
Absence of single or multiple teeth
Inner
The ameloblasts
Cementoblasts

49. What layer serves as protection for the enamel organ?
Absence of single or multiple teeth
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 outer enamel epithelium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

50. What hard tissue is innervated by nerves?
Displacement of ameloblasts to root surface
Dentin and alveolar bone
Ameloblasts
A mineralized cylinder - the dentinal tubule