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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 gemination?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ tries to divide
The ameloblasts
6th to 7th weeks

2. What is the main process involved in initiation?
Compressed layer of flat to cuboidal cells
Induction
The ectomesenchyme
Initiation

3. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementoid
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
There are none - they are lost with eruption

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

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5. Which teeth are nonsuccedaneous?
The enamel - dentin - and cementum are secreted in successive layers
The permanent molars
Dental tissues fully mineralize to their mature levels.
Faulty development of enamel from interference involving ameloblasts

6. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Osteocytes
Future dentin and pulp tissue
The basement membrane

7. What are the development disturbances of the apposition and maturation stages?
As a result of the apposition of cementum over dentin
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation - proliferation - morphogenesis
Enamel pearl - enamel dysplasia - and concresence

8. What are supernumerary teeth?
Hereditary in localized form. endocrine dysfunction is complete
Dental tissues fully mineralize to their mature levels.
Development of one or more extra teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity

9. When does macro/microdontia occur?
Trauma - pressure or metabolic disease
Bud stage
Dentin and alveolar bone
9th to 10th weeks

10. What are the processes involved in the cap stage?
Abnormally small teeth
When the gingiva recedes and no actual tooth movement takes place
6th to 7th weeks
Proliferation - differentiation - morphogenesis

11. How is the reduced enamel epithelium created?
The enamel organ is compressed
Enamel secreting cells (ameloblasts)
The basement membrane
Preameloblasts

12. What kind of cells occur in the inner enamel epithelium?
6th to 7th weeks
Tall columnar cells
There are none - they are lost with eruption
Cementoblasts

13. What kind of cells reside in the stratum intermediate?
During the cap stage
Compressed layer of flat to cuboidal cells
The ectomesenchyme - which was influenced by the neural crest cells
Absence of single or multiple teeth

14. What type of tissue is dentin - cementum - and alveolar bone?
8th week
Differentiation
Connective
Epithelial rests of Malassez

15. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Enamel organ
Compressed layer of flat to cuboidal cells
Epithelial

16. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Enamel organ invaginates into the dental papilla
Dental papilla
The dental sac
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

17. What type of tissue is enamel?
The apposition of the enamel matrix
Epithelial
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.
Osteoblasts

18. What is macrodontia?
Odontoblastic process
Cementoblasts
Abnormally large teeth
The enamel organ - dental papilla - dental sac

19. What is the structure responsible for root development?
Odontoblastic process
The cervical loop
Dental papilla
Morphogenesis

20. Active eruption
The actual vertical movement of the tooth
A bilayer rim that consists only IEE and OEE
The outer enamel epithelium
In the cap stage

21. What is the predominate process in the bell stage?
Differentiation
Initiation
Extra cusp due to effects on enamel organ
Maturation

22. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Only dentinal tubules with processes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

23. What happens during the bud stage?
Sphere of enamel on root
Commonly involves permanent maxillary lateral incisor and 3rd molars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity

24. What is the function of the Hertwig's epithelial root sheath?
The enamel - dentin - and cementum are secreted in successive layers
Osteocytes
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
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.

25. What is dens in dente?
Enamel organ invaginates into the dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Differentiation - proliferation - morphogenesis

26. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Bud stage
The basement membrane
Enamel secreting cells (ameloblasts)
Faulty development of enamel from interference involving ameloblasts

27. What are the formative cells for enamel?
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
Ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
6th to 7th weeks

28. What are the etiological factors for enamel pearl?
There are none - they are lost with eruption
Displacement of ameloblasts to root surface
Sphere of enamel on root
Initiation

29. What happens during the maturation stage?
The basement membrane
Dental tissues fully mineralize to their mature levels.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

30. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
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
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 papilla
Enamel secreting cells (ameloblasts)

31. What is enamel dysplasia?
Odontoblasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Displacement of ameloblasts to root surface
Faulty development of enamel from interference involving ameloblasts

32. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Dentin secreting cells (odontoblats)
Extra cusp due to effects on enamel organ
It disintegrates as the developing oral mucosa comes to line the oral cavity

33. 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
11th to 12th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Cuboidal cells

34. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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
Preameloblasts
Cementocytes

35. Which layer in the bell stage has star shaped cells?
Lines of Retzuis
The stellate reticulum
When the gingiva recedes and no actual tooth movement takes place
Morphogenesis

36. 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 bud stage
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

37. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The cervical loop
The ameloblasts
Abnormally small teeth
Cementoblasts

38. What wll the inner enamel epithelium differentiate into?
Odontoblasts
Enamel secreting cells (ameloblasts)
Lines of Retzuis
The permanent molars

39. When does dens in dente occur?
A bilayer rim that consists only IEE and OEE
Tooth germ
The bud stage
During the cap stage

40. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Abnormally small teeth
The permanent molars
It disintegrates as the developing oral mucosa comes to line the oral cavity
Epithelial rests of Malassez

41. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts
Cementocytes
Enamel secreting cells (ameloblasts)

42. What are the etiological factors for supernumerary teeth?
Alveolar bone
Hereditary
The enamel organ is compressed
Maturation

43. What are the incremental lines for dentin?
The enamel organ
Imbrication lines of von Ebner
Apposition of the cementum
Hereditary

44. Tooth development
Outer
Odontogenesis
The dental sac
Common on permanent molars or cingulum of anterior teeth

45. What stage does supernumerary teeth occur?
Trauma - pressure or metabolic disease
The cervical loop
The basement membrane that seperates the enamel organ and dental papilla
Initiation

46. What are the clinical ramifications of gemination?

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47. What are the developmental disturbances of the cap stage?
There are none - they are lost with eruption
Dens in dente - gemination - tubercle - and fusion
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
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

48. How is the dentinocemental junction formed?
Common on permanent molars or cingulum of anterior teeth
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
6th to 7th weeks
As a result of the apposition of cementum over dentin

49. What processes are involved with the apposition stage?
Cementocytes
The enamel organ
Induction - proliferation
Outer

50. The stellate reticulum is located inner or outer?
Outer
When the gingiva recedes and no actual tooth movement takes place
Dentin and alveolar bone
Epithelial rests of Malassez