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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 the main process involved in initiation?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Local or systemic or hereditary
Ameloblasts
Induction

2. What does the cervical loop consist of?
The apposition of the enamel matrix
A bilayer rim that consists only IEE and OEE
Osteocytes
Maturation

3. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
The dental sac
The dental lamina
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

4. What are the etiological factors of tubercle?
Initiation
Trauma - pressure or metabolic disease
Cementocytes
Dental tissues fully mineralize to their mature levels.

5. What is dens in dente?
The dental lamina
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Into odontoblasts
Enamel organ invaginates into the dental papilla

6. What else undergoes proliferation in the bud stage besides the dental lamina?
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 ectomesenchyme
4 types
Preameloblasts

7. What is the embryological background for dentin - cementum and alveolar bone?
Dental papilla
Morphogenesis
Trauma - pressure or metabolic disease
The basement membrane

8. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
Induction - proliferation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Alveolar bone
Odontoclasts

9. What happens during the bell stage?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Cementocytes
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Ameloblasts

10. What are the clinical ramifications of fusion?
Extra cusp due to effects on enamel organ
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
9th to 10th weeks
Differentiation

11. What is the process involved in the maturation stage?
The basement membrane
Maturation
Dentin secreting cells (odontoblats)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

12. What will the outer cells of the dental lamina differentiate into?
The bud stage
The actual vertical movement of the tooth
Dentin secreting cells (odontoblats)
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.

13. What type of tissue is dentin - cementum - and alveolar bone?
Connective
Proliferation - differentiation - morphogenesis
The bud stage
Maturation

14. What are the clinical ramifications of concrescence?
Union of 2 adjacent tooth germs
Common with permanent maxillary molars
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dental tissues secreted as matrix in successive layers.

15. The preameloblasts induce dental papilla cells to differentiate into what?
Dental tissues secreted as matrix in successive layers.
Into odontoblasts
Odontoblastic process
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

16. What will the dental papilla eventually form?
The outer cells of the dental papilla and the central cells of the dental papilla
Union of root structure of two or more teeth by cementum
Future dentin and pulp tissue
Osteoblasts

17. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Trauma - pressure or metabolic disease
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
When the gingiva recedes and no actual tooth movement takes place
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

18. What are the clinical ramifications of supernumerary teeth?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel organ
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
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

19. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental papilla
Osteocytes

20. What is macrodontia?
Abnormally large teeth
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
6th to 7th weeks

21. What will the inner cells of the dental lamina differentiates into?
Tooth germ tries to divide
9th to 10th weeks
The primordium of the pulp
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

22. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Tooth germ
The ectomesenchyme
It disintegrates as the developing oral mucosa comes to line the oral cavity

23. What are the formative cells for enamel?
Bud stage
Ameloblasts
8th week
Maturation

24. What happens when the reduced enamel epithelium is created?
As a result of the apposition of cementum over dentin
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
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
It disintegrates as the developing oral mucosa comes to line the oral cavity

25. What is the structure responsible for root development?
Faulty development of enamel from interference involving ameloblasts
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
The cervical loop
The primordium of the pulp

26. What is an enamel pearl?
Initiation stage
Dentin secreting cells (odontoblats)
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Sphere of enamel on root

27. What is the predominate process of the cap stage?
Morphogenesis
Absence of single or multiple teeth
Maturation
As a result of the apposition of cementum over dentin

28. What processes are involved with the apposition stage?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Trauma - pressure or metabolic disease
Induction - proliferation

29. What are the etiological factors for supernumerary teeth?
Tooth germ tries to divide
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

30. What happens during the cap stage?
Connective
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.
Common with permanent maxillary molars
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

31. Which teeth are nonsuccedaneous?
Inner
The permanent molars
Odontogenesis
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

32. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
Faulty development of enamel from interference involving ameloblasts
Proliferation - differentiation - morphogenesis
The outer cells of the dental papilla and the central cells of the dental papilla

33. What are the clinical ramifications of micro/macrodontia?
Traumatic injury or crowding of teeth
Commonly involves permanent maxillary lateral incisor and 3rd molars
The dental sac
Trauma - pressure or metabolic disease

34. What is the embryological background for enamel?
Enamel organ
Cementocytes
Dens in dente - gemination - tubercle - and fusion
Ameloblasts

35. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
The basement membrane
The ectomesenchyme - which was influenced by the neural crest cells
The primordium of the pulp

36. What kind of cells occur in the outer enamel epithelium in the bell stage?
Lines of Retzuis
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
The stellate reticulum
Cuboidal cells

37. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The dental sac
Union of 2 adjacent tooth germs
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
A bilayer rim that consists only IEE and OEE

38. What is the predominate process in the bell stage?
The apposition of the enamel matrix
Hereditary
Differentiation - proliferation - morphogenesis
Differentiation

39. What is the site for the future dentioenamel junction?
11th to 12th weeks
The basement membrane that seperates the enamel organ and dental papilla
Initiation
The basement membrane

40. What are the etiological factors for dens in dente and gemination?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Hereditary
In the cap stage
Enamel organ invaginates into the dental papilla

41. What are the clinical ramifications of gemination?

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42. What are the clinical ramifications of enamel dysplasia?
The tooth germ
Local or systemic or hereditary
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics

43. What layer serves as protection for the enamel organ?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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 outer enamel epithelium
Abnormally small teeth

44. The oral epithelium is induced by the ectomesenchyme to produce what?
The dental lamina
The apposition of the enamel matrix
The enamel organ
Initiation

45. What are the formative cells for alveolar bone?
Into odontoblasts
Osteoblasts
The ectomesenchyme - which was influenced by the neural crest cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

46. How is the reduced enamel epithelium created?
The tooth germ
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Cementocytes
The enamel organ is compressed

47. What hard tissue is can not have tissue formation after eruption?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
8th week
Enamel
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

48. What processes are involved in the bell stage?
Displacement of ameloblasts to root surface
Enamel organ invaginates into the dental papilla
Proliferation - differentiation - morphogenesis
Differentiation - proliferation - morphogenesis

49. What is gemination?
Tooth germ tries to divide
The apposition of the enamel matrix
Initiation
Cementoblasts

50. 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
Odontogenesis
Induction - proliferation
Enamel pearl - enamel dysplasia - and concresence