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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. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The basement membrane
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
Cementocytes
Cementoblasts

2. How is the dentinocemental junction formed?
Abnormally small teeth
The primordium of the pulp
As a result of the apposition of cementum over dentin
Compressed layer of flat to cuboidal cells

3. What happens during initiation?
Pressure on the area
The ameloblasts place an acellular dental cuticle on the new enamel surface
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
Development of one or more extra teeth

4. What is an enamel pearl?
Osteocytes
Lines of Retzuis
It disintegrates as the developing oral mucosa comes to line the oral cavity
Sphere of enamel on root

5. What is the function of the Hertwig's epithelial root sheath?
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
The basement membrane that seperates the enamel organ and dental papilla
Trauma - pressure or metabolic disease

6. What are the clinical ramifications of fusion?
Outer
Proliferation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

7. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Odontoclasts
Common with permanent maxillary molars
Initiation
Proliferation

8. What are the etiological factors for enamel pearl?
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
Cementoblasts
Proliferation - differentiation - morphogenesis
Displacement of ameloblasts to root surface

9. What stage does supernumerary teeth occur?
Odontoblasts
Dental tissues secreted as matrix in successive layers.
Initiation
Proliferation - differentiation - morphogenesis

10. Passive eruption
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Dental tissues secreted as matrix in successive layers.
Pressure on the area
When the gingiva recedes and no actual tooth movement takes place

11. What is another name for the dental sac?
Dental papilla
Dental follicle
Differentiation - proliferation - morphogenesis
4 types

12. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ameloblasts place an acellular dental cuticle on the new enamel surface
The primordium of the pulp

13. Active eruption
The cervical loop
Alveolar bone
The actual vertical movement of the tooth
Ameloblasts

14. Do odontoblasts start their secretion of matrix before the ameloblasts?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Differentiation
9th to 10th weeks

15. What happens during the maturation stage?
Epithelial rests of Malassez
Dental tissues fully mineralize to their mature levels.
Dentin secreting cells (odontoblats)
9th to 10th weeks

16. What happens during the apposition stage?
Enamel organ invaginates into the dental papilla
Dental tissues secreted as matrix in successive layers.
Lines of Retzuis
Differentiation - proliferation - morphogenesis

17. What kind of cells occur in the outer enamel epithelium in the bell stage?
The enamel organ is compressed
The tooth germ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cuboidal cells

18. Which layer in the bell stage has star shaped cells?
Dental tissues fully mineralize to their mature levels.
The stellate reticulum
Abnormally small teeth
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

19. What are the formative cells for dentin?
The ectoderm
The stellate reticulum
Odontoblasts
The actual vertical movement of the tooth

20. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Tooth germ
Future dentin and pulp tissue
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Trauma - pressure or metabolic disease

21. What processes are involved with the apposition stage?
Enamel pearl - enamel dysplasia - and concresence
Abnormally large teeth
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.
Induction - proliferation

22. What are the mature cells for enamel?
Epithelial
Initiation stage
There are none - they are lost with eruption
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

23. What is the time span for the cap stage?
Epithelial
The dental lamina
The basement membrane that seperates the enamel organ and dental papilla
9th to 10th weeks

24. What happens during the cap stage?
Local or systemic or hereditary
Dental papilla
The cervical loop
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. When does macro/microdontia occur?
Osteoblasts
The primary tooth can now erupt into the oral cavity - the REE fuses with the oral epithelium - then enzymes from the REE disintegrate the central portion of the epithelial tissue leaving an epithelial tunnel for the tooth to erupt
Bud stage
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

26. What will the dental sac give rise to?
Enamel organ invaginates into the dental papilla
Abnormally large teeth
Enamel pearl - enamel dysplasia - and concresence
The cementum - PDL - and alveolar bone

27. What is the process involved in the maturation stage?
Induction
Maturation
Dens in dente - gemination - tubercle - and fusion
Dentin and alveolar bone

28. What will the inner cells of the dental lamina differentiates into?
Inner
Initiation stage
The primordium of the pulp
Cuboidal cells

29. What else undergoes proliferation in the bud stage besides the dental lamina?
The ectomesenchyme
Maturation
Epithelial rests of Malassez
Abnormally large teeth

30. What is the predominate process of the cap stage?
Induction
Morphogenesis
Tooth germ
Into odontoblasts

31. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The enamel organ
8th week
It disintegrates as the developing oral mucosa comes to line the oral cavity

32. What is gemination?
Tooth germ tries to divide
The basement membrane
Lines of Retzuis
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

33. How is the reduced enamel epithelium created?
8th week
The enamel organ is compressed
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Morphogenesis

34. The stratum intermediate is located inner or outer?
Common on permanent molars or cingulum of anterior teeth
Epithelial rests of Malassez
Inner
Enamel organ

35. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
11th to 12th weeks
A bilayer rim that consists only IEE and OEE
The basement membrane

36. What are the incremental lines for enamel?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Hereditary
Ameloblasts
Lines of Retzuis

37. What is the main process involved in the bud stage?
Union of root structure of two or more teeth by cementum
Proliferation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
It disintegrates as the developing oral mucosa comes to line the oral cavity

38. What are the clinical ramifications of dens in dente?
Dental papilla
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Cementoblasts

39. What are supernumerary teeth?
The basement membrane
Dentin secreting cells (odontoblats)
Development of one or more extra teeth
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

40. What are the mature cells for cementum?
The permanent molars
Abnormally small teeth
In the cap stage
Cementocytes

41. What are the etiological factors of tubercle?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Proliferation
In the cap stage
Trauma - pressure or metabolic disease

42. Tooth development
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation - proliferation - morphogenesis
Odontogenesis
Cementoblasts

43. What is tubercle?
Differentiation - proliferation - morphogenesis
Cementoid
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
Extra cusp due to effects on enamel organ

44. When does the tooth bud become a tooth germ?
Initiation
In the cap stage
Dentin secreting cells (odontoblats)
11th to 12th weeks

45. What will the dental papilla eventually form?
6th to 7th weeks
Maturation
Future dentin and pulp tissue
Enamel organ

46. What do the odontoblasts do?
Cementocytes
Dental papilla
Bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

47. What is the embryological background for dentin - cementum and alveolar bone?
Proliferation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dentin secreting cells (odontoblats)
Dental papilla

48. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
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 bud stage
Oral epithelium
Dental papilla

49. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane
6th to 7th weeks
Maturation

50. What is the structure responsible for root development?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Union of 2 adjacent tooth germs
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The cervical loop