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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 clinical ramifications?
Pressure on the area
Common on permanent molars or cingulum of anterior teeth
The cervical loop
Dental tissues fully mineralize to their mature levels.

2. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Pressure on the area
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The cervical loop

3. When does the tooth bud become a tooth germ?
Absence of single or multiple teeth
Cementoblasts
In the cap stage
Dental papilla

4. What stage does anodontia occur?
Cementoid
Initiation stage
Ameloblasts
Abnormally large teeth

5. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Local or systemic or hereditary
Faulty development of enamel from interference involving ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Odontogenesis

6. What are the formative cells for enamel?
Tooth germ tries to divide
Trauma - pressure or metabolic disease
Ameloblasts
Compressed layer of flat to cuboidal cells

7. Tooth development
11th to 12th weeks
Differentiation - proliferation - morphogenesis
Odontogenesis
The ameloblasts place an acellular dental cuticle on the new enamel surface

8. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The ectoderm
Outer

9. What is the main process involved in the bud stage?
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.
Union of 2 adjacent tooth germs
Proliferation
Enamel organ invaginates into the dental papilla

10. What are the etiological factors for dens in dente and gemination?
The ectomesenchyme
Inner
Odontoblasts
Hereditary

11. What is the main process involved in initiation?
Union of root structure of two or more teeth by cementum
Proliferation
Induction
Only dentinal tubules with processes

12. What is the site for the future dentioenamel junction?
The permanent molars
The basement membrane that seperates the enamel organ and dental papilla
Local or systemic or hereditary
The stellate reticulum

13. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Alveolar bone
The enamel organ
May be confused as calculus deposit on root
Odontoclasts

14. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Odontoblastic process
Cementoblasts
The bud stage

15. What is the process involved in the maturation stage?
Maturation
Preameloblasts
Odontoclasts
Dental papilla

16. What type of tissue is enamel?
The basement membrane
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Into odontoblasts
Epithelial

17. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Union of 2 adjacent tooth germs
Cementoid
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

18. What happens during the bud stage?
The ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Abnormally large teeth

19. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Outer
A bilayer rim that consists only IEE and OEE
Connective
The basement membrane

20. What are the formative cells for cementum?
Epithelial
As a result of the apposition of cementum over dentin
Cementoblasts
Faulty development of enamel from interference involving ameloblasts

21. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Cementoblasts
The enamel organ is compressed
Odontoblastic process
The apposition of the enamel matrix

22. What are the formative cells for alveolar bone?
Osteoblasts
Dental tissues secreted as matrix in successive layers.
Dentin and alveolar bone
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

23. What are the etiological factors of concrescence?
Epithelial rests of Malassez
4 types
Traumatic injury or crowding of teeth
Hereditary

24. What are the mature cells for alveolar bone?
May be confused as calculus deposit on root
Maturation
Union of 2 adjacent tooth germs
Osteocytes

25. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Local or systemic or hereditary

26. What are the clinical ramifications of concrescence?
The ameloblasts
Common with permanent maxillary molars
Absence of single or multiple teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

27. What happens when the reduced enamel epithelium is created?
The outer cells of the dental papilla and the central cells of the dental papilla
Epithelial rests of Malassez
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
The actual vertical movement of the tooth

28. What stage does the dental tissues subsequently fully mineralize
Inner
Common on permanent molars or cingulum of anterior teeth
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
Maturation

29. The preameloblasts induce dental papilla cells to differentiate into what?
Epithelial
Alveolar bone
Enamel organ invaginates into the dental papilla
Into odontoblasts

30. What are the clinical ramifications of enamel dysplasia?
The outer enamel epithelium
Dentin and alveolar bone
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Oral epithelium

31. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Enamel organ invaginates into the dental papilla
Enamel organ
There is unequal growth in different parts of the tooth bud

32. What hard tissue has vascularity?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Alveolar bone
Epithelial
Dentin secreting cells (odontoblats)

33. What happens during the bell stage?
Compressed layer of flat to cuboidal cells
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Apposition of the cementum
Dental papilla

34. What is microdontia?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Abnormally small teeth
The basement membrane
4 types

35. What are the clinical ramifications of enamel pearl?
Tooth germ tries to divide
Osteocytes
Connective
May be confused as calculus deposit on root

36. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The ectomesenchyme - which was influenced by the neural crest cells
The cementum - PDL - and alveolar bone
Odontoblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

37. What does the cervical loop consist of?
Local or systemic or hereditary
As a result of the apposition of cementum over dentin
A bilayer rim that consists only IEE and OEE
Oral epithelium

38. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
The outer cells of the dental papilla and the central cells of the dental papilla
Trauma - pressure or metabolic disease
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

39. Do odontoblasts start their secretion of matrix before the ameloblasts?
Proliferation - differentiation - morphogenesis
It disintegrates as the developing oral mucosa comes to line the oral cavity
11th to 12th weeks
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

40. When does the process of root development take place?
The actual vertical movement of the tooth
The tooth germ
The stellate reticulum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

41. What is macrodontia?
Abnormally large teeth
Cementocytes
Maturation
Hereditary

42. What will the dental sac give rise to?
The ectoderm
Oral epithelium
The cementum - PDL - and alveolar bone
Dental tissues secreted as matrix in successive layers.

43. What will the inner cells of the dental lamina differentiates into?
Traumatic injury or crowding of teeth
Dentin and alveolar bone
Epithelial rests of Malassez
The primordium of the pulp

44. What are entrapped cementoblasts called?
Faulty development of enamel from interference involving ameloblasts
Cementocytes
Dental papilla
The ectomesenchyme

45. What is the embryological background for dentin - cementum and alveolar bone?
Arrest and reversal lines
Dental papilla
Enamel organ
As a result of the apposition of cementum over dentin

46. What are the major components of the tooth germ?
The basement membrane that seperates the enamel organ and dental papilla
The enamel organ - dental papilla - dental sac
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

47. What kind of cells reside in the stratum intermediate?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Commonly involves permanent maxillary lateral incisor and 3rd molars
Compressed layer of flat to cuboidal cells
Dental follicle

48. The stellate reticulum is located inner or outer?
Outer
Ameloblasts
8th week
Induction

49. What kind of cells occur in the outer enamel epithelium in the bell stage?
Inner
Cuboidal cells
As a result of the apposition of cementum over dentin
Osteoblasts

50. What are the etiological factors for micro/macrodontia?
The ameloblasts
Hereditary in localized form. endocrine dysfunction is complete
Dentin secreting cells (odontoblats)
Dentin and alveolar bone