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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 fusion?
The stellate reticulum
Union of 2 adjacent tooth germs
Dental papilla
A mineralized cylinder - the dentinal tubule

2. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Induction
Common with permanent maxillary molars
Dentin secreting cells (odontoblats)

3. What are the resorptive cells for enamel - dentin - cementum and 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
The bud stage
Future dentin and pulp tissue
Odontoclasts

4. 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
Outer
Imbrication lines of von Ebner
Ameloblasts

5. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
There are none - they are lost with eruption
The permanent molars
The outer cells of the dental papilla and the central cells of the dental papilla
A bilayer rim that consists only IEE and OEE

6. What is the main process involved in initiation?
The basement membrane
Induction - proliferation
The dental lamina
Induction

7. What kind of cells reside in the stratum intermediate?
The ectoderm
Compressed layer of flat to cuboidal cells
Odontogenesis
Odontoblasts

8. What happens when the reduced enamel epithelium is created?
Oral epithelium
The ectomesenchyme - which was influenced by the neural crest cells
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
Hereditary in localized form. endocrine dysfunction is complete

9. What is the time span for the bud stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
8th week
Common with permanent maxillary molars
Cementoid

10. What is microdontia?
The dental sac
Abnormally small teeth
Epithelial rests of Malassez
9th to 10th weeks

11. What happens during initiation?
Sphere of enamel on root
The ectomesenchyme - which was influenced by the neural crest cells
Connective
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

12. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Cementocytes
Proliferation - differentiation - morphogenesis
Hereditary
The basement membrane

13. What is the structure responsible for root development?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Epithelial rests of Malassez
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.

14. What do the odontoblasts do?
Bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
9th to 10th weeks
Dentin secreting cells (odontoblats)

15. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Union of root structure of two or more teeth by cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Preameloblasts

16. What type of tissue is dentin - cementum - and alveolar bone?
The enamel organ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Connective
Dental papilla

17. What is the time span for initiation?
6th to 7th weeks
Tooth germ
The bud stage
Common on permanent molars or cingulum of anterior teeth

18. When does dens in dente occur?
During the cap stage
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Odontoblastic process
8th week

19. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Dental papilla
Differentiation
The basement membrane that seperates the enamel organ and dental papilla

20. What processes are involved in the bell stage?
The basement membrane
Differentiation - proliferation - morphogenesis
Osteocytes
Only dentinal tubules with processes

21. What layer serves as protection for the enamel organ?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The outer enamel epithelium
Compressed layer of flat to cuboidal cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

22. Tooth development
Odontogenesis
Union of root structure of two or more teeth by cementum
The outer enamel epithelium
Only dentinal tubules with processes

23. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
The permanent molars
Odontoblasts
Union of 2 adjacent tooth germs

24. What is the time span for the bell stage?
Maturation
11th to 12th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Maturation

25. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Abnormally small teeth
The ameloblasts
Union of root structure of two or more teeth by cementum
Sphere of enamel on root

26. What is gemination?
Preameloblasts
Tall columnar cells
Tooth germ tries to divide
Cementoblasts

27. What will the inner cells of the dental lamina differentiates into?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Development of one or more extra teeth
9th to 10th weeks
The primordium of the pulp

28. What happens during the bell stage?
Faulty development of enamel from interference involving ameloblasts
Lines of Retzuis
Dentin and alveolar bone
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

29. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
In the cap stage
Cementoblasts
The basement membrane

30. What stage does the dental tissues subsequently fully mineralize
Preameloblasts
Maturation
The enamel - dentin - and cementum are secreted in successive layers
Local or systemic or hereditary

31. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The dental lamina
A bilayer rim that consists only IEE and OEE

32. What is dens in dente?
Morphogenesis
The apposition of the enamel matrix
Enamel organ invaginates into the dental papilla
Cementoid

33. What wll the inner enamel epithelium differentiate into?
Ameloblasts
Enamel secreting cells (ameloblasts)
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.
It disintegrates as the developing oral mucosa comes to line the oral cavity

34. How many types of cells are found in the enamel organ in the bell stage?
The cementum - PDL - and alveolar bone
Apposition of the cementum
May be confused as calculus deposit on root
4 types

35. What stage does anodontia occur?
Abnormally small teeth
Initiation
The bud stage
Initiation stage

36. What are the clinical ramifications of fusion?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Odontoblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts place an acellular dental cuticle on the new enamel surface

37. Where is the dental papilla originally derived from?
Apposition of the cementum
In the cap stage
The ectomesenchyme
The ectomesenchyme - which was influenced by the neural crest cells

38. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The outer cells of the dental papilla and the central cells of the dental papilla
The permanent molars
Osteocytes

39. What are the cell layers found in the enamel organ in the bell stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Cementoblasts
Epithelial rests of Malassez
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

40. What is amelogenisis?
The enamel organ - dental papilla - dental sac
The cementum - PDL - and alveolar bone
The apposition of the enamel matrix
Odontoblastic process

41. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Cementoid
The basement membrane
Commonly involves permanent maxillary lateral incisor and 3rd molars
Absence of single or multiple teeth

42. What is the time span for the cap stage?
Dental follicle
Dentin secreting cells (odontoblats)
9th to 10th weeks
May be confused as calculus deposit on root

43. What are the clinical ramifications of anodontia?
Odontoblastic process
Proliferation - differentiation - morphogenesis
The enamel organ is compressed
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

44. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Hereditary
Tooth germ tries to divide
The dental sac
Morphogenesis

45. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The basement membrane
Alveolar bone
Ameloblasts
The bud stage

46. What type of tissue is enamel?
Differentiation - proliferation - morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

47. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Sphere of enamel on root
Tall columnar cells
Enamel

48. What are the formative cells for alveolar bone?
The stellate reticulum
The primordium of the pulp
Dental tissues fully mineralize to their mature levels.
Osteoblasts

49. Which layer in the bell stage has star shaped cells?
The dental sac
The stellate reticulum
Proliferation - differentiation - morphogenesis
Proliferation

50. What hard tissue has vascularity?
Faulty development of enamel from interference involving ameloblasts
Alveolar bone
The basement membrane
Epithelial rests of Malassez