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Dentistry Tooth Development And Eruption

Subjects : health-sciences, dentistry

Instructions:

Answer 50 questions in 15 minutes. 2 minutes extra for reading the instructions.
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Match each statement with the correct term.
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1. What are the clinical ramifications of enamel pearl?
Hereditary in localized form. endocrine dysfunction is complete
May be confused as calculus deposit on root
Odontoblastic process
Extra cusp due to effects on enamel organ

2. What are the major components of the tooth germ?
6th to 7th weeks
The outer enamel epithelium
The enamel organ - dental papilla - dental sac
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

3. What is macrodontia?
Abnormally large teeth
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Enamel organ
The ectoderm

4. What are the formative cells for enamel?
The enamel organ
Ameloblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dental papilla

5. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Proliferation - differentiation - morphogenesis
Compressed layer of flat to cuboidal cells
The basement membrane
Development of one or more extra teeth

6. What are the etiological factors for anodontia?
Pressure on the area
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary in localized form. endocrine dysfunction is complete
Arrest and reversal lines

7. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Proliferation - differentiation - morphogenesis
Dentin and alveolar bone
Into odontoblasts

8. What are the clinical ramifications of dens in dente?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The ectomesenchyme
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The stellate reticulum

9. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Tall columnar cells
6th to 7th weeks
Enamel organ

10. What is concrescence?
Union of root structure of two or more teeth by cementum
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

11. What are the cell layers found in the enamel organ in the bell stage?
Extra cusp due to effects on enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The cervical loop
The outer enamel epithelium

12. What happens during the apposition stage?
The outer enamel epithelium
Ameloblasts
Dental tissues secreted as matrix in successive layers.
Cementocytes

13. What are succedaneous teeth?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane
Compressed layer of flat to cuboidal cells

14. What hard tissue is can not have tissue formation after eruption?
Enamel
Dental follicle
Osteoblasts
8th week

15. What are the mature cells for enamel?
Alveolar bone
There are none - they are lost with eruption
In the cap stage
6th to 7th weeks

16. What kind of cells occur in the inner enamel epithelium?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Local or systemic or hereditary
Into odontoblasts
Tall columnar cells

17. When the inner epithelial epithelium columnar cells elongate and repolarize they differentiate into what?
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Preameloblasts
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The actual vertical movement of the tooth

18. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Dentin secreting cells (odontoblats)
The outer enamel epithelium
It disintegrates as the developing oral mucosa comes to line the oral cavity

19. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The outer enamel epithelium
Odontoblastic process
Common on permanent molars or cingulum of anterior teeth
Future dentin and pulp tissue

20. The stratum intermediate is located inner or outer?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Inner
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Faulty development of enamel from interference involving ameloblasts

21. What are supernumerary teeth?
Oral epithelium
There are none - they are lost with eruption
Osteocytes
Development of one or more extra teeth

22. What happens during the bell stage?
Maturation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The dental sac
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

23. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Cementoblasts
Apposition of the cementum
Morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

24. What are the clinical ramifications?
Common on permanent molars or cingulum of anterior teeth
4 types
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The dental lamina

25. Where does the primordium of the permanent dentition develop?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The outer cells of the dental papilla and the central cells of the dental papilla
The basement membrane that seperates the enamel organ and dental papilla
Absence of single or multiple teeth

26. What is the structure responsible for root development?
The cervical loop
Preameloblasts
Cementoblasts
The basement membrane

27. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Lines of Retzuis
The bud stage
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

28. What is the predominate process in the bell stage?
Into odontoblasts
Differentiation
The basement membrane
Dental papilla

29. What is the cap in the cap stage?
The basement membrane
Dentin secreting cells (odontoblats)
4 types
The enamel organ

30. What processes are involved in the bell stage?
Dental papilla
During the cap stage
The ectomesenchyme
Differentiation - proliferation - morphogenesis

31. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The cementum - PDL - and alveolar bone
The outer cells of the dental papilla and the central cells of the dental papilla
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Tooth germ tries to divide

32. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Dens in dente - gemination - tubercle - and fusion
The ameloblasts
The apposition of the enamel matrix
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

33. What are the clinical ramifications of gemination?

34. What is the time span for initiation?
6th to 7th weeks
Pressure on the area
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
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

35. What are the etiological factors for fusion?
Differentiation - proliferation - morphogenesis
Pressure on the area
The dental lamina
Dental tissues fully mineralize to their mature levels.

36. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Differentiation
Hereditary
The outer cells of the dental papilla and the central cells of the dental papilla
Development of one or more extra teeth

37. What happens during the bud stage?
Union of root structure of two or more teeth by cementum
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Arrest and reversal lines

38. Tooth development
Inner
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Odontogenesis
Preameloblasts

39. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Dental papilla
The dental sac
The tooth germ
Pressure on the area

40. What are the formative cells for alveolar bone?
Trauma - pressure or metabolic disease
Proliferation
Outer
Osteoblasts

41. How is the dentinocemental junction formed?
Tall columnar cells
Pressure on the area
As a result of the apposition of cementum over dentin
The enamel organ - dental papilla - dental sac

42. What kind of cells occur in the outer enamel epithelium in the bell stage?
Odontogenesis
Oral epithelium
Common with permanent maxillary molars
Cuboidal cells

43. What type of tissue is enamel?
Odontogenesis
8th week
Epithelial
Apposition of the cementum

44. What is the time span for the bud stage?
Common with permanent maxillary molars
8th week
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Pressure on the area

45. What processes are involved with the apposition stage?
In the cap stage
A bilayer rim that consists only IEE and OEE
Induction - proliferation
The outer cells of the dental papilla and the central cells of the dental papilla

46. How many types of cells are found in the enamel organ in the bell stage?
The cementum - PDL - and alveolar bone
Cuboidal cells
Induction - proliferation
4 types

47. What is another name for the dental sac?
The ectoderm
Initiation
Odontoblastic process
Dental follicle

48. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
There is unequal growth in different parts of the tooth bud
Enamel organ invaginates into the dental papilla
Odontoclasts
Morphogenesis

49. What is the outer portion of the ectoderm in the initiation stage?
Enamel secreting cells (ameloblasts)
It disintegrates as the developing oral mucosa comes to line the oral cavity
Oral epithelium
The enamel organ

50. What are the etiological factors for micro/macrodontia?
When the gingiva recedes and no actual tooth movement takes place
Hereditary in localized form. endocrine dysfunction is complete
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
Dental papilla

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Dentistry Tooth Development And Eruption

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