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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 predominate process of the cap stage?
Cementocytes
The apposition of the enamel matrix
Enamel
Morphogenesis

2. What is the predominate process in the bell stage?
Differentiation
The basement membrane
Osteocytes
Odontoblastic process

3. What kind of cells reside in the stratum intermediate?
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
Union of root structure of two or more teeth by cementum
Initiation
Compressed layer of flat to cuboidal cells

4. What are the clinical ramifications of supernumerary teeth?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Osteocytes
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 Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

5. What are the etiological factors of tubercle?
Enamel
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Trauma - pressure or metabolic disease
8th week

6. What processes are involved with the apposition stage?
Induction - proliferation
The outer enamel epithelium
Dental papilla
Apposition of the cementum

7. What kind of cells occur in the outer enamel epithelium in the bell stage?
Cuboidal cells
Common on permanent molars or cingulum of anterior teeth
There is unequal growth in different parts of the tooth bud
Arrest and reversal lines

8. What happens during initiation?
Proliferation
9th to 10th weeks
Growth of the dental lamina into bud that penetrates growing 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

9. Which teeth are nonsuccedaneous?
The bud stage
The ectomesenchyme - which was influenced by the neural crest cells
Development of one or more extra teeth
The permanent molars

10. What are the incremental lines for cementum and alveolar bone?
There is unequal growth in different parts of the tooth bud
Oral epithelium
The cementum - PDL - and alveolar bone
Arrest and reversal lines

11. What is concrescence?
Faulty development of enamel from interference involving ameloblasts
The actual vertical movement of the tooth
Union of root structure of two or more teeth by cementum
Outer

12. What happens during the bell stage?
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Faulty development of enamel from interference involving ameloblasts
The cementum - PDL - and alveolar bone

13. What are the cell layers found in the enamel organ in the bell stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Common with permanent maxillary molars
Dental papilla

14. What is the main process involved in the bud stage?
Proliferation
Enamel secreting cells (ameloblasts)
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The basement membrane that seperates the enamel organ and dental papilla

15. What are succedaneous teeth?
Tall columnar cells
Into odontoblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The outer cells of the dental papilla and the central cells of the dental papilla

16. What does the cervical loop consist of?
There are none - they are lost with eruption
Common on permanent molars or cingulum of anterior teeth
A bilayer rim that consists only IEE and OEE
Enamel

17. What happens during the maturation stage?
Future dentin and pulp tissue
Dental tissues fully mineralize to their mature levels.
Enamel organ
Local or systemic or hereditary

18. When does macro/microdontia occur?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Bud stage
6th to 7th weeks
A mineralized cylinder - the dentinal tubule

19. What are the mature cells for enamel?
Epithelial rests of Malassez
The enamel organ
There are none - they are lost with eruption
Inner

20. What wll the inner enamel epithelium differentiate into?
Union of root structure of two or more teeth by cementum
Enamel secreting cells (ameloblasts)
Extra cusp due to effects on enamel organ
Cementoblasts

21. What is the process involved in the maturation stage?
Cementocytes
Abnormally small teeth
Maturation
Oral epithelium

22. What are the etiological factors for dens in dente and gemination?
Hereditary
Proliferation
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
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.

23. What is matrix?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Maturation
6th to 7th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

24. What is another name for the dental sac?
Dental follicle
Cuboidal cells
Induction
The tooth germ

25. What stage does the dental tissues subsequently fully mineralize
Maturation
The dental lamina
9th to 10th weeks
8th week

26. How is the reduced enamel epithelium created?
The enamel organ is compressed
Enamel pearl - enamel dysplasia - and concresence
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
The ectomesenchyme - which was influenced by the neural crest cells

27. What are the major components of the tooth germ?
Maturation
The enamel organ - dental papilla - dental sac
Hereditary
Differentiation - proliferation - morphogenesis

28. What will the dental papilla eventually form?
Future dentin and pulp tissue
There is unequal growth in different parts of the tooth bud
Tooth germ
Extra cusp due to effects on enamel organ

29. What are the processes involved in the cap stage?
Proliferation - differentiation - morphogenesis
Induction
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Extra cusp due to effects on enamel organ

30. 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
Development of one or more extra teeth
Enamel organ invaginates into the dental papilla
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.

31. What happens during the appositional stage?
Extra cusp due to effects on enamel organ
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
Enamel
The enamel - dentin - and cementum are secreted in successive layers

32. What do the odontoblasts do?
Large tooth with two pulp cavities. one fewer tooth 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
Alveolar bone
Compressed layer of flat to cuboidal cells

33. What is amelogenisis?
The apposition of the enamel matrix
The bud stage
Tooth germ
The enamel organ

34. Where is the dental papilla originally derived from?
Epithelial
Hereditary
The ectomesenchyme - which was influenced by the neural crest cells
Preameloblasts

35. How is the dentinocemental junction formed?
Cementocytes
Commonly involves permanent maxillary lateral incisor and 3rd molars
As a result of the apposition of cementum over dentin
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

36. When does the process of root development take place?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The cervical loop
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

37. What are the development disturbances of the apposition and maturation stages?
Enamel organ invaginates into the dental papilla
Enamel pearl - enamel dysplasia - and concresence
A mineralized cylinder - the dentinal tubule
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion

38. What are the etiological factors for supernumerary teeth?
Ameloblasts
Inner
Hereditary
Abnormally small teeth

39. What are the clinical ramifications of enamel pearl?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
May be confused as calculus deposit on root
The basement membrane

40. What hard tissue is innervated by nerves?
Dentin 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
As a result of the apposition of cementum over dentin

41. Active eruption
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The cervical loop
Odontoblasts
The actual vertical movement of the tooth

42. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
11th to 12th weeks
Imbrication lines of von Ebner
The dental sac
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

43. What are the mature cells for alveolar bone?
Local or systemic or hereditary
Osteocytes
May be confused as calculus deposit on root
Initiation stage

44. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Outer
The ameloblasts place an acellular dental cuticle on the new enamel surface
Traumatic injury or crowding of teeth
Extra cusp due to effects on enamel organ

45. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ectomesenchyme
Development of one or more extra teeth
The ameloblasts
Into odontoblasts

46. What type of tissue is dentin - cementum - and alveolar bone?
The ectomesenchyme
Connective
Epithelial
Apposition of the cementum

47. What are the clinical ramifications of micro/macrodontia?
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Trauma - pressure or metabolic disease
Commonly involves permanent maxillary lateral incisor and 3rd molars
Preameloblasts

48. What are the clinical ramifications of dens in dente?
The ectomesenchyme
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Only dentinal tubules with processes
Epithelial rests of Malassez

49. The stellate reticulum is located inner or outer?
Outer
Hereditary
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The permanent molars

50. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Dental papilla
11th to 12th weeks
Odontoblastic process