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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 does the cervical loop consist of?
In the cap stage
A bilayer rim that consists only IEE and OEE
The enamel organ is compressed
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

2. What are the incremental lines for dentin?
Oral epithelium
Union of 2 adjacent tooth germs
Imbrication lines of von Ebner
Tooth germ

3. The oral epithelium is induced by the ectomesenchyme to produce what?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
During the cap stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The dental lamina

4. When does macro/microdontia occur?
Odontoblasts
Extra cusp due to effects on enamel organ
Proliferation - differentiation - morphogenesis
Bud stage

5. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
The cementum - PDL - and alveolar bone
Displacement of ameloblasts to root surface
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

6. What hard tissue is can not have tissue formation after eruption?
The outer cells of the dental papilla and the central cells of the dental papilla
Enamel
The basement membrane
Local or systemic or hereditary

7. What is the time span for initiation?
Local or systemic or hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
There is unequal growth in different parts of the tooth bud
6th to 7th weeks

8. What is the time span for the cap stage?
The enamel organ - dental papilla - dental sac
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
9th to 10th weeks
Initiation stage

9. What is tubercle?
Odontogenesis
4 types
Extra cusp due to effects on enamel organ
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

10. What are succedaneous teeth?
Osteoblasts
Hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tall columnar cells

11. What is the outer portion of the ectoderm in the initiation stage?
The stellate reticulum
Oral epithelium
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

12. What will the inner cells of the dental lamina differentiates into?
The permanent molars
Dental papilla
The primordium of the pulp
During the cap stage

13. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Hereditary

14. What are the etiological factors for micro/macrodontia?
Enamel pearl - enamel dysplasia - and concresence
Hereditary in localized form. endocrine dysfunction is complete
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 ectomesenchyme

15. What are the mature cells for alveolar bone?
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 tissues fully mineralize to their mature levels.
Osteocytes
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

16. What hard tissue is innervated by nerves?
Cementocytes
Dental papilla
Dentin and alveolar bone
8th week

17. What is microdontia?
Development of one or more extra teeth
Abnormally small teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

18. What is the structure responsible for root development?
Ameloblasts
Local or systemic or hereditary
The cervical loop
Faulty development of enamel from interference involving ameloblasts

19. What are the etiological factors of concrescence?
Differentiation - proliferation - morphogenesis
9th to 10th weeks
Into odontoblasts
Traumatic injury or crowding of teeth

20. Where is the dental papilla originally derived from?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The permanent molars
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme - which was influenced by the neural crest cells

21. What are the clinical ramifications of micro/macrodontia?
Maturation
There is unequal growth in different parts of the tooth bud
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Commonly involves permanent maxillary lateral incisor and 3rd molars

22. What are the formative cells for alveolar bone?
Osteoblasts
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 cervical loop
The outer cells of the dental papilla and the central cells of the dental papilla

23. What are the incremental lines for cementum and alveolar bone?
Enamel pearl - enamel dysplasia - and concresence
The enamel organ is compressed
Arrest and reversal lines
Dens in dente - gemination - tubercle - and fusion

24. What is concrescence?
Proliferation
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementocytes
Union of root structure of two or more teeth by cementum

25. What are the clinical ramifications?
Odontoblastic process
Common on permanent molars or cingulum of anterior teeth
Development of one or more extra teeth
There is unequal growth in different parts of the tooth bud

26. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The basement membrane
The basement membrane that seperates the enamel organ and dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla
Dens in dente - gemination - tubercle - and fusion

27. What is the main process involved in initiation?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Hereditary
Enamel organ
Induction

28. What happens during initiation?
Hereditary in localized form. endocrine dysfunction is complete
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 enamel organ - dental papilla - dental sac
Preameloblasts

29. 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
Dental follicle
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Initiation stage

30. What are the clinical ramifications of concrescence?
Odontoblastic process
Common with permanent maxillary molars
Arrest and reversal lines
4 types

31. What are entrapped cementoblasts called?
Cementocytes
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Cementoblasts
In the cap stage

32. When does the process of root development take place?
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
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
Cuboidal cells

33. What are the cell layers found in the enamel organ in the bell stage?
As a result of the apposition of cementum over dentin
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoblasts

34. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
During the cap stage
Commonly involves permanent maxillary lateral incisor and 3rd molars
Epithelial rests of Malassez

35. What are the clinical ramifications of enamel dysplasia?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
There is unequal growth in different parts of the tooth bud
The stellate reticulum
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

36. What stage does anodontia occur?
Initiation stage
Odontoblastic process
May be confused as calculus deposit on root
The primordium of the pulp

37. What is fusion?
Cementoid
Outer
The stellate reticulum
Union of 2 adjacent tooth germs

38. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
Hereditary in localized form. endocrine dysfunction is complete
The enamel organ is compressed
Trauma - pressure or metabolic disease

39. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Cementoblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Odontoclasts
The dental sac

40. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel secreting cells (ameloblasts)
Hereditary

41. What happens during the cap stage?
Differentiation
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.
Future dentin and pulp tissue
Osteoblasts

42. What kind of cells occur in the inner enamel epithelium?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The tooth germ
During the cap stage
Tall columnar cells

43. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Differentiation
Connective
Lines of Retzuis
Preameloblasts

44. What are the incremental lines for enamel?
Ameloblasts
Lines of Retzuis
The ectomesenchyme
Dentin secreting cells (odontoblats)

45. What layer serves as protection for the enamel organ?
Induction
Enamel
The outer enamel epithelium
The enamel organ

46. What are the etiological factors for fusion?
Union of root structure of two or more teeth by cementum
The basement membrane that seperates the enamel organ and dental papilla
Pressure on the area
Morphogenesis

47. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Induction - proliferation
Odontoblastic process
Abnormally large teeth
The outer cells of the dental papilla and the central cells of the dental papilla

48. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Sphere of enamel on root
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

49. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Enamel organ invaginates into the dental papilla
Induction - proliferation
Cementoblasts

50. What happens during the apposition stage?
Maturation
Dental papilla
Dental tissues secreted as matrix in successive layers.
The outer enamel epithelium