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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. How is the dentinocemental junction formed?
The cementum - PDL - and alveolar bone
As a result of the apposition of cementum over dentin
Odontoblasts
The cervical loop

2. When does the tooth bud become a tooth germ?
In the cap stage
Ameloblasts
The cementum - PDL - and alveolar bone
Abnormally large teeth

3. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
The ectomesenchyme
The ameloblasts
Maturation
Common with permanent maxillary molars

4. When does macro/microdontia occur?
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
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentin and alveolar bone
Bud stage

5. What is the time span for the bell stage?
Imbrication lines of von Ebner
11th to 12th weeks
Dental papilla
It disintegrates as the developing oral mucosa comes to line the oral cavity

6. What are the clinical ramifications of concrescence?
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
8th week
Common with permanent maxillary molars

7. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Ameloblasts
Odontoblasts
There are none - they are lost with eruption

8. What are the etiological factors of enamel dysplasia?
Local or systemic or hereditary
Bud stage
There is unequal growth in different parts of the tooth bud
Enamel pearl - enamel dysplasia - and concresence

9. What is the cap in the cap stage?
There is unequal growth in different parts of the tooth bud
Dental papilla
The enamel organ
Odontoclasts

10. 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
Sphere of enamel on root
Inner
Cementocytes

11. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Inner
Ameloblasts
In the cap stage
The basement membrane

12. What is the time span for the bud 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
Dental tissues fully mineralize to their mature levels.
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
8th week

13. What happens during the bud stage?
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
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

14. What is the time span for initiation?
The enamel organ
Epithelial rests of Malassez
6th to 7th weeks
Differentiation

15. What are the etiological factors for fusion?
Pressure on the area
The ectomesenchyme
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Extra cusp due to effects on enamel organ

16. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
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.
Apposition of the cementum
The outer cells of the dental papilla and the central cells of the dental papilla
Common on permanent molars or cingulum of anterior teeth

17. What is anodontia?
Enamel organ invaginates into the dental papilla
The ameloblasts
8th week
Absence of single or multiple teeth

18. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Initiation
The ameloblasts place an acellular dental cuticle on the new enamel surface
Dentin and alveolar bone
Future dentin and pulp tissue

19. What are supernumerary teeth?
11th to 12th weeks
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The outer enamel epithelium
Development of one or more extra teeth

20. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Dentin and alveolar bone
Epithelial rests of Malassez
Odontoclasts
A bilayer rim that consists only IEE and OEE

21. What stage does the dental tissues subsequently fully mineralize
Dental tissues secreted as matrix in successive layers.
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Union of root structure of two or more teeth by cementum
Maturation

22. What is the cementum matrix called?
The ectomesenchyme - which was influenced by the neural crest cells
Cementoid
Enamel organ invaginates into the dental papilla
Sphere of enamel on root

23. What are the etiological factors of tubercle?
Induction
Trauma - pressure or metabolic disease
The bud stage
The basement membrane

24. The stratum intermediate is located inner or outer?
The permanent molars
There is unequal growth in different parts of the tooth bud
Inner
Common on permanent molars or cingulum of anterior teeth

25. What happens during the apposition stage?
Dental tissues secreted as matrix in successive layers.
Bud stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
The permanent molars

26. Active eruption
Common on permanent molars or cingulum of anterior teeth
Pressure on the area
Union of root structure of two or more teeth by cementum
The actual vertical movement of the tooth

27. What are the mature cells for enamel?
May be confused as calculus deposit on root
Pressure on the area
Maturation
There are none - they are lost with eruption

28. What happens when the reduced enamel epithelium is created?
9th to 10th weeks
Dentin and alveolar bone
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
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

29. What is the primordium of the tooth?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The basement membrane that seperates the enamel organ and dental papilla
The tooth germ
Displacement of ameloblasts to root surface

30. What layer serves as protection for the enamel organ?
Maturation
Cementoblasts
The outer enamel epithelium
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

31. What hard tissue is innervated by nerves?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Ameloblasts
Dentin and alveolar bone
Enamel organ

32. What are the etiological factors for anodontia?
Union of 2 adjacent tooth germs
Ameloblasts
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

33. What are the etiological factors for enamel pearl?
Into odontoblasts
9th to 10th weeks
Displacement of ameloblasts to root surface
Union of root structure of two or more teeth by cementum

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

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35. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Enamel pearl - enamel dysplasia - and concresence
Dentin secreting cells (odontoblats)
Cementocytes
The dental sac

36. What are the clinical ramifications of micro/macrodontia?
Commonly involves permanent maxillary lateral incisor and 3rd molars
Dental papilla
Initiation stage
Hereditary in localized form. endocrine dysfunction is complete

37. What happens during initiation?
Hereditary
Odontoclasts
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 cementum - PDL - and alveolar bone

38. When does the process of root development take place?
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
The primordium of the pulp
Future dentin and pulp tissue

39. Where does the primordium of the permanent dentition develop?
Alveolar bone
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Abnormally large teeth
Dental papilla

40. What is the outer portion of the ectoderm in the initiation stage?
Epithelial rests of Malassez
Tooth germ
The cervical loop
Oral epithelium

41. How is the reduced enamel epithelium created?
Dental papilla
The ameloblasts
The stellate reticulum
The enamel organ is compressed

42. What stage does supernumerary teeth occur?
Initiation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The enamel organ is compressed
6th to 7th weeks

43. What are the processes involved in the cap stage?
A bilayer rim that consists only IEE and OEE
Proliferation - differentiation - morphogenesis
Preameloblasts
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

44. What is the structure responsible for root development?
The cervical loop
The ectoderm
Commonly involves permanent maxillary lateral incisor and 3rd molars
Enamel secreting cells (ameloblasts)

45. What are the incremental lines for cementum and alveolar bone?
Faulty development of enamel from interference involving ameloblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Odontoblastic process
Arrest and reversal lines

46. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Trauma - pressure or metabolic disease
The stellate reticulum
Tooth germ
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

47. What will the dental papilla eventually form?
Future dentin and pulp tissue
Hereditary
Osteocytes
A bilayer rim that consists only IEE and OEE

48. What are the clinical ramifications of dens in dente?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tall columnar cells
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

49. Tooth development
Imbrication lines of von Ebner
Odontogenesis
Abnormally large teeth
4 types

50. What are the clinical ramifications of enamel dysplasia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
As a result of the apposition of cementum over dentin
Sphere of enamel on root
During the cap stage