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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 happens during the apposition stage?
Future dentin and pulp tissue
May be confused as calculus deposit on root
Odontogenesis
Dental tissues secreted as matrix in successive layers.

2. What is dens in dente?
Common with permanent maxillary molars
Enamel organ invaginates into the dental papilla
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Absence of single or multiple teeth

3. What is enamel dysplasia?
Absence of single or multiple teeth
Faulty development of enamel from interference involving ameloblasts
The basement membrane that seperates the enamel organ and dental papilla
Tall columnar cells

4. What are the cell layers found in the enamel organ in the bell stage?
Oral epithelium
The tooth germ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
There is unequal growth in different parts of the tooth bud

5. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
9th to 10th weeks
The ameloblasts
Enamel

6. What are succedaneous teeth?
Cementoid
There is unequal growth in different parts of the tooth bud
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Enamel

7. What processes are involved with the apposition stage?
Arrest and reversal lines
Imbrication lines of von Ebner
Induction - proliferation
Ameloblasts

8. Passive eruption
Enamel
Dental tissues fully mineralize to their mature levels.
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum

9. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
Pressure on the area
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 apposition of the enamel matrix

10. When does macro/microdontia occur?
Local or systemic or hereditary
A bilayer rim that consists only IEE and OEE
Odontoblasts
Bud stage

11. What are the formative cells for dentin?
Odontoblasts
Dental follicle
Union of root structure of two or more teeth by cementum
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

12. What are the clinical ramifications of enamel pearl?
Abnormally large teeth
Only dentinal tubules with processes
4 types
May be confused as calculus deposit on root

13. What are the mature cells for alveolar bone?
The cementum - PDL - and alveolar bone
Abnormally large teeth
The enamel - dentin - and cementum are secreted in successive layers
Osteocytes

14. What is the time span for initiation?
The primordium of the pulp
The enamel organ is compressed
4 types
6th to 7th weeks

15. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Tooth germ
Preameloblasts
Pressure on the area

16. What are the etiological factors for supernumerary teeth?
Differentiation - proliferation - morphogenesis
Hereditary
The stellate reticulum
The tooth germ

17. What does the cervical loop consist of?
Sphere of enamel on root
Union of 2 adjacent tooth germs
A bilayer rim that consists only IEE and OEE
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

18. What are the etiological factors for enamel pearl?
The enamel - dentin - and cementum are secreted in successive layers
The cervical loop
Cementocytes
Displacement of ameloblasts to root surface

19. What are the etiological factors for dens in dente and gemination?
Dental papilla
Hereditary
Dental papilla
The outer enamel epithelium

20. What else undergoes proliferation in the bud stage besides the dental lamina?
Preameloblasts
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Future dentin and pulp tissue
The ectomesenchyme

21. What is concrescence?
Future dentin and pulp tissue
Union of root structure of two or more teeth by cementum
The enamel organ - dental papilla - dental sac
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

22. What is the cementum matrix called?
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
Cementoid
Odontoblasts
Hereditary

23. What will the dental papilla eventually form?
Initiation stage
Differentiation - proliferation - morphogenesis
The ameloblasts
Future dentin and pulp tissue

24. When does the process of root development take place?
The primordium of the pulp
The outer cells of the dental papilla and the central cells of the dental papilla
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The ectomesenchyme

25. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The enamel organ - dental papilla - dental sac
Cementocytes
Enamel
The outer cells of the dental papilla and the central cells of the dental papilla

26. What are the etiological factors for anodontia?
Proliferation - differentiation - morphogenesis
In the cap stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
During the cap stage

27. Active eruption
Cementoblasts
The cervical loop
The actual vertical movement of the tooth
Future dentin and pulp tissue

28. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
11th to 12th weeks
A bilayer rim that consists only IEE and OEE
Inner

29. What is anodontia?
Absence of single or multiple teeth
Pressure on the area
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Enamel

30. What happens during initiation?
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.
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 dental sac
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

31. What are the clinical ramifications of micro/macrodontia?
Dentin and alveolar bone
Hereditary
Commonly involves permanent maxillary lateral incisor and 3rd molars
As a result of the apposition of cementum over dentin

32. Where does the primordium of the permanent dentition develop?
Initiation stage
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
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Apposition of the cementum

33. What are entrapped cementoblasts called?
Development of one or more extra teeth
Oral epithelium
Cementocytes
Tall columnar cells

34. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Displacement of ameloblasts to root surface
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental papilla
Alveolar bone

35. What is the cap in the cap stage?
Sphere of enamel on root
The cervical loop
The enamel organ
The basement membrane

36. What is another name for the dental sac?
Maturation
Dental follicle
The bud stage
Common with permanent maxillary molars

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

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38. What are the incremental lines for cementum and alveolar bone?
Hereditary
Arrest and reversal lines
Enamel secreting cells (ameloblasts)
Odontoblasts

39. What happens when the reduced enamel epithelium is created?
Hereditary
Dental tissues secreted as matrix in successive layers.
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
Tooth germ

40. What stage does anodontia occur?
The ectomesenchyme
Common on permanent molars or cingulum of anterior teeth
Cementocytes
Initiation stage

41. What are the incremental lines for enamel?
Lines of Retzuis
Dentin secreting cells (odontoblats)
Odontoclasts
9th to 10th weeks

42. What are the clinical ramifications of anodontia?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Imbrication lines of von Ebner
9th to 10th weeks

43. What are the clinical ramifications of gemination?

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44. Which layer in the bell stage has star shaped cells?
Bud stage
The stellate reticulum
During the cap stage
The ectomesenchyme

45. What is the primordium of the tooth?
The tooth germ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Commonly involves permanent maxillary lateral incisor and 3rd molars
Proliferation

46. When does dens in dente occur?
Abnormally small teeth
During the cap stage
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
9th to 10th weeks

47. The stellate reticulum is located inner or outer?
Induction
Odontogenesis
Outer
The basement membrane that seperates the enamel organ and dental papilla

48. What hard tissue is innervated by nerves?
Epithelial
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
Dentin and alveolar bone
The primordium of the pulp

49. The oral epithelium is induced by the ectomesenchyme to produce what?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The bud stage
Extra cusp due to effects on enamel organ
The dental lamina

50. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Enamel
Tooth germ
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 cervical loop