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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 the structure responsible for root development?
Common on permanent molars or cingulum of anterior teeth
When the gingiva recedes and no actual tooth movement takes place
The cervical loop
6th to 7th weeks

2. Where is the dental papilla originally derived from?
Tall columnar cells
The ectomesenchyme - which was influenced by the neural crest cells
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane

3. The stratum intermediate is located inner or outer?
The ectoderm
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Inner
There are none - they are lost with eruption

4. Where is the enamal organ originally derived from?
Faulty development of enamel from interference involving ameloblasts
The ectoderm
4 types
The dental sac

5. What is the primordium of the tooth?
The tooth germ
Extra cusp due to effects on enamel organ
The ameloblasts
Tooth germ

6. Which teeth are nonsuccedaneous?
The enamel - dentin - and cementum are secreted in successive layers
8th week
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The permanent molars

7. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Induction - proliferation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
9th to 10th weeks

8. How is the dentinocemental junction formed?
Union of 2 adjacent tooth germs
As a result of the apposition of cementum over dentin
Proliferation
8th week

9. What are the incremental lines for cementum and alveolar bone?
Alveolar bone
The enamel organ is compressed
Arrest and reversal lines
The outer cells of the dental papilla and the central cells of the dental papilla

10. What are the etiological factors for enamel pearl?
When the gingiva recedes and no actual tooth movement takes place
Enamel organ invaginates into the dental papilla
Displacement of ameloblasts to root surface
It disintegrates as the developing oral mucosa comes to line the oral cavity

11. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
The outer cells of the dental papilla and the central cells of the dental papilla
Maturation
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

12. What is the main process involved in initiation?
A mineralized cylinder - the dentinal tubule
Induction
Sphere of enamel on root
Alveolar bone

13. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Tall columnar cells
The enamel - dentin - and cementum are secreted in successive layers
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

14. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dens in dente - gemination - tubercle - and fusion
The basement membrane
The outer cells of the dental papilla and the central cells of the dental papilla

15. What are the mature cells for enamel?
Common with permanent maxillary molars
The bud stage
Extra cusp due to effects on enamel organ
There are none - they are lost with eruption

16. What will the dental papilla eventually form?
Hereditary
Morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Future dentin and pulp tissue

17. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Commonly involves permanent maxillary lateral incisor and 3rd molars
The enamel - dentin - and cementum are secreted in successive layers
Union of 2 adjacent tooth germs

18. What are the odontoblastic processes is contained in what?
Differentiation
Odontoclasts
Compressed layer of flat to cuboidal cells
A mineralized cylinder - the dentinal tubule

19. What are succedaneous teeth?
The basement membrane
Abnormally small teeth
Extra cusp due to effects on enamel organ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

20. What are the etiological factors of concrescence?
Odontoclasts
Traumatic injury or crowding of teeth
Osteocytes
Outer

21. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Cuboidal cells
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementoblasts
Odontoblasts

22. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
8th week
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

23. What kind of cells occur in the outer enamel epithelium in the bell stage?
9th to 10th weeks
May be confused as calculus deposit on root
Traumatic injury or crowding of teeth
Cuboidal cells

24. What is the time span for the cap stage?
9th to 10th weeks
Connective
Morphogenesis
In the cap stage

25. What are the etiological factors for supernumerary teeth?
The bud stage
Hereditary
Lines of Retzuis
As a result of the apposition of cementum over dentin

26. What layer serves as protection for the enamel organ?
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
The stellate reticulum
Connective

27. How is the reduced enamel epithelium created?
The enamel - dentin - and cementum are secreted in successive layers
Dental follicle
The enamel organ is compressed
Local or systemic or hereditary

28. Do odontoblasts start their secretion of matrix before the ameloblasts?
Abnormally large teeth
Dental papilla
6th to 7th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

29. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
During the cap stage
The ectoderm
Initiation

30. What happens during the cap stage?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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.
Union of 2 adjacent tooth germs
Differentiation - proliferation - morphogenesis

31. What are the developmental disturbances of the cap stage?
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
Dens in dente - gemination - tubercle - and fusion
Dental papilla

32. What are supernumerary teeth?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Development of one or more extra teeth
Compressed layer of flat to cuboidal cells
Cementocytes

33. What are the clinical ramifications of dens in dente?
8th week
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The bud stage
Alveolar bone

34. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The basement membrane
Induction - proliferation
There are none - they are lost with eruption

35. What is dens in dente?
Maturation
Proliferation - differentiation - morphogenesis
Enamel organ invaginates into the dental papilla
Pressure on the area

36. Where does the primordium of the permanent dentition develop?
In the cap stage
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

37. What are the etiological factors for anodontia?
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
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
When the gingiva recedes and no actual tooth movement takes place

38. What are the etiological factors of tubercle?
Maturation
Enamel
The tooth germ
Trauma - pressure or metabolic disease

39. What are the major components of the tooth germ?
6th to 7th weeks
Enamel secreting cells (ameloblasts)
The enamel organ - dental papilla - dental sac
Cementocytes

40. What are the clinical ramifications of supernumerary teeth?
Tooth germ
Initiation stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

41. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Enamel secreting cells (ameloblasts)
Only dentinal tubules with processes
Epithelial rests of Malassez
Dental tissues fully mineralize to their mature levels.

42. What else undergoes proliferation in the bud stage besides the dental lamina?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Enamel pearl - enamel dysplasia - and concresence
In the cap stage
The ectomesenchyme

43. What processes are involved with the apposition stage?
The ectomesenchyme
Enamel organ
Development of one or more extra teeth
Induction - proliferation

44. What is microdontia?
Abnormally small teeth
Alveolar bone
Imbrication lines of von Ebner
The basement membrane

45. What are the formative cells for dentin?
Odontoblasts
Hereditary
Dentin and alveolar bone
In the cap stage

46. Tooth development
Faulty development of enamel from interference involving ameloblasts
Odontogenesis
9th to 10th weeks
Proliferation

47. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Cementoblasts
Into odontoblasts
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

48. What is the embryological background for dentin - cementum and alveolar bone?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Faulty development of enamel from interference involving ameloblasts
Dental papilla
The enamel - dentin - and cementum are secreted in successive layers

49. What stage does supernumerary teeth occur?
The cervical loop
Preameloblasts
Initiation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

50. What is the main process involved in the bud stage?
Dental tissues secreted as matrix in successive layers.
Odontoclasts
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
Proliferation