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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 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
9th to 10th weeks
Pressure on the area
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

2. What is the time span for the bud stage?
4 types
Hereditary in localized form. endocrine dysfunction is complete
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
8th week

3. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The basement membrane
Odontoblastic process
Compressed layer of flat to cuboidal cells

4. What are the formative cells for alveolar bone?
Extra cusp due to effects on enamel organ
Dental tissues secreted as matrix in successive layers.
Osteoblasts
Induction

5. What type of tissue is dentin - cementum - and alveolar bone?
Imbrication lines of von Ebner
Connective
It disintegrates as the developing oral mucosa comes to line the oral cavity
Into odontoblasts

6. What is fusion?
Union of 2 adjacent tooth germs
Dentin and alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The dental lamina

7. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Union of 2 adjacent tooth germs
Displacement of ameloblasts to root surface
Dental follicle

8. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
Union of root structure of two or more teeth by cementum
Epithelial rests of Malassez
Faulty development of enamel from interference involving ameloblasts

9. Passive eruption
When the gingiva recedes and no actual tooth movement takes place
Hereditary in localized form. endocrine dysfunction is complete
Outer
Traumatic injury or crowding of teeth

10. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Trauma - pressure or metabolic disease
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Epithelial rests of Malassez
The basement membrane

11. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Lines of Retzuis
Dental papilla
Tooth germ tries to divide
6th to 7th weeks

12. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
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
Cementoblasts
Osteoblasts

13. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Hereditary
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The cervical loop

14. How many types of cells are found in the enamel organ in the bell stage?
Extra cusp due to effects on enamel organ
There is unequal growth in different parts of the tooth bud
4 types
Apposition of the cementum

15. What do the odontoblasts do?
When the gingiva recedes and no actual tooth movement takes place
The ectomesenchyme
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The permanent molars

16. What is the predominate process in the bell stage?
As a result of the apposition of cementum over dentin
Differentiation
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.

17. What is the time span for the cap stage?
Dental papilla
Osteocytes
Bud stage
9th to 10th weeks

18. What are the cell layers found in the enamel organ in the bell stage?
Imbrication lines of von Ebner
Tooth germ tries to divide
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The stellate reticulum

19. What are the clinical ramifications of fusion?
The dental sac
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Tooth germ tries to divide

20. Which teeth are nonsuccedaneous?
Bud stage
There is unequal growth in different parts of the tooth bud
Dens in dente - gemination - tubercle - and fusion
The permanent molars

21. When does the tooth bud become a tooth germ?
Only dentinal tubules with processes
Hereditary
In the cap stage
Odontoclasts

22. What processes are involved in the bell stage?
Ameloblasts
Differentiation - proliferation - morphogenesis
Epithelial rests of Malassez
Tooth germ

23. What layer serves as protection for the enamel organ?
The outer enamel epithelium
Cementoblasts
Hereditary
Lines of Retzuis

24. What is the predominate process of the cap stage?
The outer enamel epithelium
Morphogenesis
Faulty development of enamel from interference involving ameloblasts
Hereditary in localized form. endocrine dysfunction is complete

25. What will the inner cells of the dental lamina differentiates into?
11th to 12th weeks
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.
Proliferation - differentiation - morphogenesis
The primordium of the pulp

26. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Oral epithelium
Common on permanent molars or cingulum of anterior teeth
Odontoclasts
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

27. When does macro/microdontia occur?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Osteocytes
Bud stage
Only dentinal tubules with processes

28. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
The ameloblasts
Proliferation
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

29. What happens when the reduced enamel epithelium is created?
The enamel organ is compressed
Dentin secreting cells (odontoblats)
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
Future dentin and pulp tissue

30. What are succedaneous teeth?
When the gingiva recedes and no actual tooth movement takes place
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
11th to 12th weeks
Trauma - pressure or metabolic disease

31. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
8th week
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place
The basement membrane

32. What are the etiological factors for anodontia?
Traumatic injury or crowding of teeth
Dental tissues secreted as matrix in successive layers.
The basement membrane that seperates the enamel organ and dental papilla
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

33. What hard tissue has vascularity?
Cementoblasts
Displacement of ameloblasts to root surface
Alveolar bone
Oral epithelium

34. What is the primordium of the tooth?
Lines of Retzuis
Hereditary
The ameloblasts
The tooth germ

35. Tooth development
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The enamel organ is compressed
Odontogenesis
Induction

36. What are the major components of the tooth germ?
The enamel organ - dental papilla - dental sac
Future dentin and pulp tissue
Dental follicle
A mineralized cylinder - the dentinal tubule

37. What wll the inner enamel epithelium differentiate into?
Odontogenesis
Enamel secreting cells (ameloblasts)
Odontoblastic process
Cementocytes

38. What happens during the maturation stage?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental tissues fully mineralize to their mature levels.
The ameloblasts
Enamel organ

39. Active eruption
Enamel pearl - enamel dysplasia - and concresence
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The actual vertical movement of the tooth
It disintegrates as the developing oral mucosa comes to line the oral cavity

40. What kind of cells occur in the outer enamel epithelium in the bell stage?
The cementum - PDL - and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
Common with permanent maxillary molars
Cuboidal cells

41. Where is the enamal organ originally derived from?
Union of root structure of two or more teeth by cementum
The ectoderm
Sphere of enamel on root
The outer enamel epithelium

42. What are the incremental lines for cementum and alveolar bone?
Enamel
Apposition of the cementum
Arrest and reversal lines
Enamel pearl - enamel dysplasia - and concresence

43. What are the formative cells for enamel?
The bud stage
Ameloblasts
Enamel
Common with permanent maxillary molars

44. When does dens in dente occur?
During the cap stage
Initiation
Only dentinal tubules with processes
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

45. What hard tissue is innervated by nerves?
Union of 2 adjacent tooth germs
Dentin and alveolar bone
A mineralized cylinder - the dentinal tubule
Dental tissues secreted as matrix in successive layers.

46. What are the mature cells for alveolar bone?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Osteocytes
Inner

47. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Cementoblasts
Development of one or more extra teeth
Dental papilla

48. What is microdontia?
Induction
Abnormally small teeth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

49. Where is the enamel matrix secreted from by the ameloblasts?

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50. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The cervical loop
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Sphere of enamel on root
Preameloblasts