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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 kind of cells reside in the stratum intermediate?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Compressed layer of flat to cuboidal cells
The ectomesenchyme
9th to 10th weeks

2. What is the time span for initiation?
The cervical loop
Dental papilla
6th to 7th weeks
The apposition of the enamel matrix

3. What is the process involved in the maturation stage?
Cuboidal cells
Maturation
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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

4. What happens during the cap stage?
Dens in dente - gemination - tubercle - and fusion
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.
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
4 types

5. The oral epithelium is induced by the ectomesenchyme to produce what?
The enamel organ - dental papilla - dental sac
Inner
Local or systemic or hereditary
The dental lamina

6. What are the etiological factors of enamel dysplasia?
The dental sac
The basement membrane
Oral epithelium
Local or systemic or hereditary

7. What is cementogenisis?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The stellate reticulum
Apposition of the cementum
Odontoblasts

8. What are supernumerary teeth?
Development of one or more extra teeth
Tooth germ
Morphogenesis
Union of 2 adjacent tooth germs

9. What are the clinical ramifications of enamel dysplasia?
Enamel organ
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Traumatic injury or crowding of teeth
There are none - they are lost with eruption

10. What is the predominate process in the bell stage?
The basement membrane that seperates the enamel organ and dental papilla
Imbrication lines of von Ebner
Osteocytes
Differentiation

11. What is the time span for the bell stage?
11th to 12th weeks
Abnormally small teeth
4 types
The dental lamina

12. How is the dentinocemental junction formed?
Enamel
As a result of the apposition of cementum over dentin
Hereditary in localized form. endocrine dysfunction is complete
Cementocytes

13. Where is the enamal organ originally derived from?
The ectoderm
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.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Outer

14. What is the structure responsible for root development?
The cervical loop
Dental tissues secreted as matrix in successive layers.
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone

15. What type of tissue is dentin - cementum - and alveolar bone?
The ameloblasts
Pressure on the area
Connective
The apposition of the enamel matrix

16. 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
The dental sac
Common on permanent molars or cingulum of anterior teeth
Cementoblasts

17. What stage does anodontia occur?
Initiation stage
The outer enamel epithelium
Cementoid
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

18. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Cementocytes
Tall columnar cells
11th to 12th weeks
The bud stage

19. Which teeth are nonsuccedaneous?
Cementoblasts
Sphere of enamel on root
Hereditary
The permanent molars

20. What is the main process involved in the bud stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cementocytes
Proliferation
Into odontoblasts

21. What is concrescence?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Union of root structure of two or more teeth by cementum
Abnormally small teeth
Abnormally large teeth

22. What kind of cells occur in the inner enamel epithelium?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Enamel organ
Maturation
Tall columnar cells

23. What are the clinical ramifications of 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
The basement membrane that seperates the enamel organ and dental papilla
Dental tissues fully mineralize to their mature levels.
May be confused as calculus deposit on root

24. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Osteoblasts
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Hereditary

25. What are the clinical ramifications of micro/macrodontia?
During the cap stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Cementocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars

26. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The basement membrane
The ameloblasts place an acellular dental cuticle on the new enamel surface
Cementoid
Bud stage

27. What are the odontoblastic processes is contained in what?
Tooth germ
In the cap stage
Cementoblasts
A mineralized cylinder - the dentinal tubule

28. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
The stellate reticulum
Maturation
Cementocytes

29. What are entrapped cementoblasts called?
Osteocytes
The bud stage
Faulty development of enamel from interference involving ameloblasts
Cementocytes

30. What are the formative cells for enamel?
Into odontoblasts
The primordium of the pulp
Ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells

31. What is fusion?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Local or systemic or hereditary
Union of 2 adjacent tooth germs
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

32. What are the etiological factors for supernumerary teeth?
When the gingiva recedes and no actual tooth movement takes place
Oral epithelium
Hereditary
Compressed layer of flat to cuboidal cells

33. What hard tissue has vascularity?
The outer cells of the dental papilla and the central cells of the dental papilla
Alveolar bone
Connective
The enamel organ

34. When does the tooth bud become a tooth germ?
Abnormally small teeth
Into odontoblasts
In the cap stage
Enamel

35. What happens during the appositional stage?
The enamel - dentin - and cementum are secreted in successive layers
Sphere of enamel on root
Alveolar bone
Only dentinal tubules with processes

36. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The cementum - PDL - and alveolar bone
Oral epithelium
Apposition of the cementum
Tooth germ

37. What is another name for the dental sac?
The cementum - PDL - and alveolar bone
Dental follicle
Union of 2 adjacent tooth germs
Dens in dente - gemination - tubercle - and fusion

38. What is the time span for the cap stage?
The outer cells of the dental papilla and the central cells of the dental papilla
9th to 10th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dens in dente - gemination - tubercle - and fusion

39. What is the time span for 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.
Ameloblasts
8th week
Enamel

40. What does the cervical loop consist of?
The basement membrane
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
A bilayer rim that consists only IEE and OEE

41. When does dens in dente occur?
Cementoid
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The ectomesenchyme
During the cap stage

42. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Connective
Epithelial rests of Malassez
8th week

43. Where is the dental sac originally derived from?
The ectomesenchyme
A mineralized cylinder - the dentinal tubule
Enamel organ invaginates into the dental papilla
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

44. What are the development disturbances of the apposition and maturation stages?
The basement membrane
Enamel pearl - enamel dysplasia - and concresence
Enamel secreting cells (ameloblasts)
Outer

45. What wll the inner enamel epithelium differentiate into?
The ectomesenchyme - which was influenced by the neural crest cells
Local or systemic or hereditary
The actual vertical movement of the tooth
Enamel secreting cells (ameloblasts)

46. What will the dental papilla eventually form?
Union of 2 adjacent tooth germs
Pressure on the area
Future dentin and pulp tissue
Initiation

47. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
The dental lamina
Union of 2 adjacent tooth germs
Bud stage

48. What happens during the bell stage?
Enamel organ invaginates into the dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

49. What processes are involved in the bell stage?
Dental papilla
Differentiation - proliferation - morphogenesis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dens in dente - gemination - tubercle - and fusion

50. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
Initiation stage
The apposition of the enamel matrix
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel