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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 inner mass in the cap stage that forms a concavity of the enamel organ?
Arrest and reversal lines
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
The basement membrane that seperates the enamel organ and dental papilla

2. The stratum intermediate is located inner or outer?
Inner
The outer enamel epithelium
Odontoblasts
Enamel organ invaginates into the dental papilla

3. What is the time span for the bell stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Initiation
11th to 12th weeks
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.

4. What will the dental papilla eventually form?
Future dentin and pulp tissue
4 types
The basement membrane
Trauma - pressure or metabolic disease

5. What are the clinical ramifications?
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth
9th to 10th weeks
Hereditary

6. What happens during the bud stage?
Dental follicle
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

7. The stellate reticulum is located inner or outer?
Outer
As a result of the apposition of cementum over dentin
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
Absence of single or multiple teeth

8. What type of tissue is dentin - cementum - and alveolar bone?
Tall columnar cells
Connective
Inner
The dental sac

9. What is the main process involved in initiation?
Sphere of enamel on root
Common with permanent maxillary molars
Proliferation - differentiation - morphogenesis
Induction

10. What stage does supernumerary teeth occur?
Initiation
Traumatic injury or crowding of teeth
Dentin secreting cells (odontoblats)
Displacement of ameloblasts to root surface

11. What processes are involved in the bell stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Osteocytes
Differentiation - proliferation - morphogenesis
Apposition of the cementum

12. What is anodontia?
Sphere of enamel on root
Absence of single or multiple teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
A mineralized cylinder - the dentinal tubule

13. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Abnormally large teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
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.

14. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Apposition of the cementum
Tooth germ tries to divide
Enamel organ invaginates into the dental papilla

15. What is the primordium of the tooth?
Odontoblasts
Odontoclasts
The tooth germ
Faulty development of enamel from interference involving ameloblasts

16. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
There is unequal growth in different parts of the tooth bud
The apposition of the enamel matrix
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

17. How is the dentinocemental junction formed?
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
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
As a result of the apposition of cementum over dentin
Pressure on the area

18. When does macro/microdontia occur?
Bud stage
Future dentin and pulp tissue
Abnormally small teeth
4 types

19. When does the process of root development take place?
Faulty development of enamel from interference involving ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Connective

20. What are the etiological factors for fusion?
Enamel organ invaginates into the dental papilla
Cementocytes
Pressure on the area
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

21. What are the mature cells for dentin?
Only dentinal tubules with processes
The actual vertical movement of the tooth
Faulty development of enamel from interference involving ameloblasts
Dental papilla

22. What is matrix?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Only dentinal tubules with processes
Cementoblasts
Dental tissues secreted as matrix in successive layers.

23. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ is compressed
Odontoclasts
Enamel pearl - enamel dysplasia - and concresence

24. What is the predominate process in the bell stage?
4 types
There are none - they are lost with eruption
Differentiation
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

25. What is the function of the Hertwig's epithelial root sheath?
The apposition of the enamel matrix
Hereditary
The primordium of the pulp
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

26. Where is the dental sac originally derived from?
The ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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

27. What do the odontoblasts do?
The enamel organ - dental papilla - dental sac
Cementoblasts
Arrest and reversal lines
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

28. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Dental tissues secreted as matrix in successive layers.
The outer cells of the dental papilla and the central cells of the dental papilla
Future dentin and pulp tissue
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

29. What stage does anodontia occur?
Dentin and alveolar bone
Apposition of the cementum
Common with permanent maxillary molars
Initiation stage

30. What is the structure responsible for root development?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Induction
A bilayer rim that consists only IEE and OEE
The cervical loop

31. What are the processes involved in the cap stage?
Connective
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Dental follicle
Proliferation - differentiation - morphogenesis

32. What processes are involved with the apposition stage?
Extra cusp due to effects on enamel organ
Hereditary
Induction - proliferation
Union of 2 adjacent tooth germs

33. The oral epithelium is induced by the ectomesenchyme to produce what?
Pressure on the area
When the gingiva recedes and no actual tooth movement takes place
The dental lamina
Epithelial

34. What else undergoes proliferation in the bud stage besides the dental lamina?
Maturation
The ectomesenchyme
Initiation stage
The actual vertical movement of the tooth

35. What is the predominate process of the cap stage?
Morphogenesis
Epithelial rests of Malassez
Tooth germ tries to divide
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

36. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Alveolar bone
Tooth germ tries to divide
Inner

37. What are the formative cells for alveolar bone?
Pressure on the area
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel organ
Osteoblasts

38. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
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 ectomesenchyme - which was influenced by the neural crest cells
Cementoblasts

39. What is the time span for the cap stage?
9th to 10th weeks
The outer cells of the dental papilla and the central cells of the dental papilla
The dental sac
6th to 7th weeks

40. What is another name for the dental sac?
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
Dental follicle
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

41. In the cap stage the tooth bud does not grow - what happens?
Future dentin and pulp tissue
Union of 2 adjacent tooth germs
There is unequal growth in different parts of the tooth bud
Maturation

42. What happens during the bell stage?
Bud stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Development of one or more extra teeth

43. What happens during the apposition stage?
The primordium of the pulp
Cementoblasts
Dental tissues secreted as matrix in successive layers.
Outer

44. What is cementogenisis?
Outer
Apposition of the cementum
Initiation
Tall columnar cells

45. What are the formative cells for enamel?
Ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ is compressed
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

46. What is gemination?
Sphere of enamel on root
Faulty development of enamel from interference involving ameloblasts
Enamel organ invaginates into the dental papilla
Tooth germ tries to divide

47. How many types of cells are found in the enamel organ in the bell stage?
Dens in dente - gemination - tubercle - and fusion
4 types
A bilayer rim that consists only IEE and OEE
The enamel organ is compressed

48. What are the formative cells for dentin?
Initiation
Future dentin and pulp tissue
The basement membrane
Odontoblasts

49. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
The basement membrane
Odontoblastic process
Preameloblasts

50. What are the incremental lines for dentin?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
A bilayer rim that consists only IEE and OEE
Imbrication lines of von Ebner
Alveolar bone