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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 formative cells for enamel?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Ameloblasts
Cementocytes
9th to 10th weeks

2. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Union of root structure of two or more teeth by cementum
Odontogenesis
Dentin secreting cells (odontoblats)

3. What are the formative cells for dentin?
Odontoblasts
Odontoclasts
Union of 2 adjacent tooth germs
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

4. What are the etiological factors of concrescence?
Dental papilla
Traumatic injury or crowding of teeth
Absence of single or multiple teeth
Enamel

5. What processes are involved in the bell stage?
The bud stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Differentiation - proliferation - morphogenesis
Abnormally large teeth

6. In the cap stage the tooth bud does not grow - what happens?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
There is unequal growth in different parts of the tooth bud
Only dentinal tubules with processes
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

7. What are the formative cells for cementum?
The cervical loop
Cementoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cementocytes

8. What are the etiological factors for fusion?
Pressure on the area
The ectomesenchyme - which was influenced by the neural crest cells
The enamel organ - dental papilla - dental sac
Displacement of ameloblasts to root surface

9. What are the etiological factors of tubercle?
The stellate reticulum
Trauma - pressure or metabolic disease
Cementocytes
Union of root structure of two or more teeth by cementum

10. 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
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
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
Differentiation

11. What is dens in dente?
Hereditary
As a result of the apposition of cementum over dentin
The basement membrane
Enamel organ invaginates into the dental papilla

12. What is microdontia?
The enamel organ
During the cap stage
Abnormally small teeth
Tall columnar cells

13. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Enamel organ invaginates into the dental papilla
Differentiation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

14. The stratum intermediate is located inner or outer?
Inner
Cementoblasts
The apposition of the enamel matrix
Dental follicle

15. What are the clinical ramifications of enamel pearl?
Union of root structure of two or more teeth by cementum
May be confused as calculus deposit on root
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The outer cells of the dental papilla and the central cells of the dental papilla

16. What is concrescence?
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum
Into odontoblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

17. What are the development disturbances of the apposition and maturation stages?
Enamel pearl - enamel dysplasia - and concresence
Commonly involves permanent maxillary lateral incisor and 3rd molars
Ameloblasts
8th week

18. What is the function of the Hertwig's epithelial root sheath?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Apposition of the cementum

19. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
8th week
Ameloblasts
Osteocytes

20. What are the mature cells for dentin?
Dentin secreting cells (odontoblats)
Induction - proliferation
Inner
Only dentinal tubules with processes

21. What are the major components of the tooth germ?
The tooth germ
Odontoblastic process
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ - dental papilla - dental sac

22. The stellate reticulum is located inner or outer?
Outer
Inner
Dentin and alveolar bone
Abnormally small teeth

23. What are the cell layers found in the enamel organ in the bell stage?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Absence of single or multiple teeth
Morphogenesis
The actual vertical movement of the tooth

24. What is an enamel pearl?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Sphere of enamel on root
Local or systemic or hereditary
Inner

25. What hard tissue is innervated by nerves?
The cementum - PDL - and alveolar bone
Abnormally small teeth
Dentin and alveolar bone
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

26. How is the reduced enamel epithelium created?
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 ameloblasts
The enamel organ is compressed
Outer

27. What is the time span for the bell stage?
Hereditary
Cementoblasts
The ameloblasts
11th to 12th weeks

28. What are the incremental lines for cementum and alveolar bone?
Odontoblastic process
It disintegrates as the developing oral mucosa comes to line the oral cavity
Arrest and reversal lines
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

29. Where is the dental papilla originally derived from?
Odontogenesis
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The enamel - dentin - and cementum are secreted in successive layers
The ectomesenchyme - which was influenced by the neural crest cells

30. What stage does anodontia occur?
Initiation stage
Dentin and alveolar bone
The basement membrane
May be confused as calculus deposit on root

31. How is the dentinocemental junction formed?
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
Trauma - pressure or metabolic disease
The ameloblasts

32. What are the formative cells for alveolar bone?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
There are none - they are lost with eruption
Osteoblasts
When the gingiva recedes and no actual tooth movement takes place

33. What type of tissue is enamel?
Extra cusp due to effects on enamel organ
Epithelial
Abnormally small teeth
Cementocytes

34. When does macro/microdontia occur?
Compressed layer of flat to cuboidal cells
Cementoid
Bud stage
The tooth germ

35. Where is the enamal organ originally derived from?
The ectoderm
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental follicle
The ameloblasts

36. Which layer in the bell stage has star shaped cells?
Tooth germ
The stellate reticulum
11th to 12th weeks
Dental papilla

37. What is the predominate process in the bell stage?
Differentiation
Enamel
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Union of 2 adjacent tooth germs

38. What are the etiological factors for supernumerary teeth?
Lines of Retzuis
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Hereditary
Odontoclasts

39. What happens during initiation?
Hereditary
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
Enamel organ
Arrest and reversal lines

40. What is the embryological background for dentin - cementum and alveolar bone?
There are none - they are lost with eruption
Odontoblastic process
Dental papilla
Cementocytes

41. What is the time span for the bud stage?
8th week
The outer cells of the dental papilla and the central cells of the dental papilla
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.
Connective

42. What is the outer portion of the ectoderm in the initiation stage?
Local or systemic or hereditary
The ectomesenchyme
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Oral epithelium

43. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
Alveolar bone
The enamel organ - dental papilla - dental sac
Maturation

44. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Traumatic injury or crowding of teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Dental tissues fully mineralize to their mature levels.

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

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46. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The ameloblasts place an acellular dental cuticle on the new enamel surface
Tooth germ

47. What is macrodontia?
Cementocytes
Development of one or more extra teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Abnormally large teeth

48. What are the clinical ramifications of micro/macrodontia?
Odontoclasts
Commonly involves permanent maxillary lateral incisor and 3rd molars
Initiation stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

49. What are the clinical ramifications of anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The ameloblasts place an acellular dental cuticle on the new enamel surface
Into odontoblasts

50. What kind of cells occur in the outer enamel epithelium in the bell stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Cuboidal cells
Maturation
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics