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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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1. What are supernumerary teeth?
Development of one or more extra teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla
The cervical loop

2. What happens during the bell stage?
The dental lamina
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Dental tissues secreted as matrix in successive layers.

3. What hard tissue is can not have tissue formation after eruption?
4 types
Only dentinal tubules with processes
Enamel
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. What are the formative cells for cementum?
Proliferation - differentiation - morphogenesis
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
Tooth germ tries to divide
Cementoblasts

5. What happens when the reduced enamel epithelium is created?
Proliferation - differentiation - morphogenesis
Tall columnar 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
Odontoblastic process

6. Where is the enamal organ originally derived from?
The ectoderm
Future dentin and pulp tissue
Dental papilla
Local or systemic or hereditary

7. Where is the dental papilla originally derived from?
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Connective
The ectomesenchyme - which was influenced by the neural crest cells

8. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Abnormally small teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation

9. What are the mature cells for enamel?
The bud stage
There are none - they are lost with eruption
Lines of Retzuis
The enamel organ

10. What happens during the bud stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Only dentinal tubules with processes
Preameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

11. What is the outer portion of the ectoderm in the initiation stage?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Oral epithelium
The enamel organ
Enamel organ

12. How is the reduced enamel epithelium created?
The cervical loop
The ectomesenchyme
The enamel organ is compressed
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

13. Where does the primordium of the permanent dentition develop?
The ectoderm
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
Dental papilla
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

14. Active eruption
Development of one or more extra teeth
The actual vertical movement of the tooth
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The tooth germ

15. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The stellate reticulum
Enamel organ
The basement membrane that seperates the enamel organ and dental papilla

16. What are the clinical ramifications?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Union of 2 adjacent tooth germs
Common on permanent molars or cingulum of anterior teeth
The ameloblasts place an acellular dental cuticle on the new enamel surface

17. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The ameloblasts
Dental tissues fully mineralize to their mature levels.
Imbrication lines of von Ebner

18. What are the developmental disturbances of the cap stage?
Maturation
The stellate reticulum
Future dentin and pulp tissue
Dens in dente - gemination - tubercle - and fusion

19. In the cap stage the tooth bud does not grow - what happens?
Faulty development of enamel from interference involving ameloblasts
Preameloblasts
The basement membrane that seperates the enamel organ and dental papilla
There is unequal growth in different parts of the tooth bud

20. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
When the gingiva recedes and no actual tooth movement takes place
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.
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

21. When does macro/microdontia occur?
Bud stage
Cementoblasts
Absence of single or multiple teeth
Cuboidal cells

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

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23. What is the cap in the cap stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Morphogenesis
Dental papilla
The enamel organ

24. What are the clinical ramifications of enamel pearl?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
May be confused as calculus deposit on root
Cementocytes
Ameloblasts

25. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Maturation
The basement membrane
Hereditary

26. What is fusion?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
The enamel organ - dental papilla - dental sac
The primordium of the pulp
Union of 2 adjacent tooth germs

27. Which teeth are nonsuccedaneous?
The permanent molars
The cervical loop
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

28. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ is compressed
Into odontoblasts
The ectomesenchyme
Odontoblastic process

29. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
May be confused as calculus deposit on root
The apposition of the enamel matrix
The ameloblasts
The dental lamina

30. What is the site for the future dentioenamel junction?
The cementum - PDL - and alveolar bone
Arrest and reversal lines
The basement membrane that seperates the enamel organ and dental papilla
The apposition of the enamel matrix

31. What happens during the apposition stage?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Abnormally large teeth
Dental tissues secreted as matrix in successive layers.
Proliferation

32. What are the incremental lines for enamel?
Lines of Retzuis
The dental lamina
Trauma - pressure or metabolic disease
Odontoclasts

33. What are the incremental lines for cementum and alveolar bone?
Enamel secreting cells (ameloblasts)
Development of one or more extra teeth
Absence of single or multiple teeth
Arrest and reversal lines

34. What will the dental sac give rise to?
May be confused as calculus deposit on root
The cementum - PDL - and alveolar bone
Tooth germ tries to divide
Apposition of the cementum

35. What processes are involved with the apposition stage?
Trauma - pressure or metabolic disease
Induction - proliferation
A bilayer rim that consists only IEE and OEE
The ectomesenchyme

36. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
Preameloblasts
Cuboidal 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
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

37. What are the etiological factors for fusion?
The cementum - PDL - and alveolar bone
Pressure on the area
The enamel organ
A mineralized cylinder - the dentinal tubule

38. What are the formative cells for alveolar bone?
Osteoblasts
Union of root structure of two or more teeth by cementum
The outer enamel epithelium
Dental tissues fully mineralize to their mature levels.

39. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Hereditary
Abnormally large teeth
Preameloblasts

40. What is the embryological background for enamel?
Local or systemic or hereditary
There are none - they are lost with eruption
Enamel organ
Extra cusp due to effects on enamel organ

41. What else undergoes proliferation in the bud stage besides the dental lamina?
Tooth germ tries to divide
The primordium of the pulp
Only dentinal tubules with processes
The ectomesenchyme

42. What are the processes involved in the cap stage?
Ameloblasts
Proliferation - differentiation - morphogenesis
The basement membrane that seperates the enamel organ and dental papilla
Morphogenesis

43. What happens during the maturation stage?
Dental tissues fully mineralize to their mature levels.
The dental sac
Outer
Dentin secreting cells (odontoblats)

44. What is the time span for the cap stage?
Ameloblasts
9th to 10th weeks
The ectomesenchyme
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

45. What are the mature cells for alveolar bone?
Hereditary
Osteocytes
Into odontoblasts
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

46. What are the etiological factors for anodontia?
The apposition of the enamel matrix
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
The stellate reticulum
Dental papilla

47. When does the process of root development take place?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
The enamel organ is compressed

48. What kind of cells reside in the stratum intermediate?
The dental sac
Compressed layer of flat to cuboidal cells
Dental follicle
The enamel organ

49. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
During the cap stage
Dens in dente - gemination - tubercle - and fusion
Initiation

50. What happens during initiation?
It disintegrates as the developing oral mucosa comes to line the oral cavity
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
The ectoderm
There is unequal growth in different parts of the tooth bud