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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 are the etiological factors of concrescence?
Development of one or more extra teeth
Preameloblasts
Cuboidal cells
Traumatic injury or crowding of teeth

2. What is the structure responsible for root development?
The cervical loop
Abnormally large teeth
The enamel organ - dental papilla - dental sac
Bud stage

3. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
The enamel organ
The ameloblasts place an acellular dental cuticle on the new enamel surface
Enamel pearl - enamel dysplasia - and concresence
Tall columnar cells

4. What is matrix?
May be confused as calculus deposit on root
Epithelial rests of Malassez
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The bud stage

5. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Absence of single or multiple teeth
Proliferation

6. What is the predominate process of the cap stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Hereditary
Morphogenesis
Enamel organ invaginates into the dental papilla

7. What are the etiological factors of enamel dysplasia?
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Faulty development of enamel from interference involving ameloblasts
Local or systemic or hereditary

8. What is gemination?
Tooth germ tries to divide
Cementocytes
Union of root structure of two or more teeth by cementum
The primordium of the pulp

9. What are the etiological factors for enamel pearl?
Displacement of ameloblasts to root surface
When the gingiva recedes and no actual tooth movement takes place
Differentiation - proliferation - morphogenesis
Cementocytes

10. What is the site for the future dentioenamel junction?
Displacement of ameloblasts to root surface
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The basement membrane that seperates the enamel organ and dental papilla
Local or systemic or hereditary

11. Tooth development
Dens in dente - gemination - tubercle - and fusion
Enamel
Odontogenesis
Maturation

12. What happens during initiation?
Only dentinal tubules with processes
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
Commonly involves permanent maxillary lateral incisor and 3rd molars
Initiation

13. What are the clinical ramifications of supernumerary teeth?
Pressure on the area
The apposition of the enamel matrix
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Odontogenesis

14. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Dentin secreting cells (odontoblats)
Hereditary
Tall columnar cells

15. What stage does anodontia occur?
A mineralized cylinder - the dentinal tubule
Initiation stage
Ameloblasts
Odontoblastic process

16. What happens when the reduced enamel epithelium is created?
Cementocytes
During the cap stage
Odontoblastic process
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

17. 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 tooth germ
6th to 7th weeks
Inner

18. What are the formative cells for cementum?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Traumatic injury or crowding of teeth
Bud stage
Cementoblasts

19. What happens during the cap stage?
Common on permanent molars or cingulum of anterior teeth
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.
The tooth germ
The basement membrane that seperates the enamel organ and dental papilla

20. What are the etiological factors for micro/macrodontia?
Hereditary in localized form. endocrine dysfunction is complete
The basement membrane
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Arrest and reversal lines

21. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
The outer cells of the dental papilla and the central cells of the dental papilla
Proliferation
There is unequal growth in different parts of the tooth bud
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

22. What is dens in dente?
Epithelial rests of Malassez
The enamel organ is compressed
Common on permanent molars or cingulum of anterior teeth
Enamel organ invaginates into the dental papilla

23. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
The ectomesenchyme
Odontoblasts
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.

24. What kind of cells occur in the inner enamel epithelium?
4 types
Tall columnar cells
Faulty development of enamel from interference involving ameloblasts
Union of root structure of two or more teeth by cementum

25. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Maturation
In the cap stage
Cementoid

26. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
As a result of the apposition of cementum over dentin
Differentiation - proliferation - morphogenesis
Osteoblasts

27. What is fusion?
8th week
11th to 12th weeks
Union of 2 adjacent tooth germs
The dental lamina

28. What type of tissue is enamel?
Epithelial
Inner
When the gingiva recedes and no actual tooth movement takes place
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs

29. What is the embryological background for dentin - cementum and alveolar bone?
The stellate reticulum
4 types
Proliferation
Dental papilla

30. How many types of cells are found in the enamel organ in the bell stage?
Proliferation - differentiation - morphogenesis
Induction - proliferation
Induction
4 types

31. What are the clinical ramifications of gemination?

32. Which teeth are nonsuccedaneous?
Dentin secreting cells (odontoblats)
The basement membrane
Arrest and reversal lines
The permanent molars

33. In the cap stage the tooth bud does not grow - what happens?
Tall columnar cells
A bilayer rim that consists only IEE and OEE
There is unequal growth in different parts of the tooth bud
Hereditary

34. What processes are involved with the apposition stage?
Apposition of the cementum
It disintegrates as the developing oral mucosa comes to line the oral cavity
The enamel - dentin - and cementum are secreted in successive layers
Induction - proliferation

35. What is amelogenisis?
The ectomesenchyme
Morphogenesis
Future dentin and pulp tissue
The apposition of the enamel matrix

36. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ is compressed
Odontoblastic process
Differentiation - proliferation - morphogenesis
Proliferation

37. What is the embryological background for enamel?
The ameloblasts
Outer
Enamel organ
Abnormally large teeth

38. What is the time span for initiation?
6th to 7th weeks
The tooth germ
Odontoblasts
Cementoid

39. What are the etiological factors for supernumerary teeth?
Imbrication lines of von Ebner
The basement membrane
Hereditary
The ectomesenchyme

40. What happens during the apposition stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental tissues secreted as matrix in successive layers.
Inner
The dental sac

41. What are the mature cells for alveolar bone?
Proliferation - differentiation - morphogenesis
Osteocytes
Inner
Cementocytes

42. What are the cell layers found in the enamel organ in the bell stage?
Hereditary
The ectoderm
Lines of Retzuis
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

43. What are the etiological factors of tubercle?
Development of one or more extra teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Tooth germ
Trauma - pressure or metabolic disease

44. What else undergoes proliferation in the bud stage besides the dental lamina?
Hereditary
Dental follicle
The ectomesenchyme
The dental sac

45. What do the odontoblasts do?
Osteocytes
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
The enamel organ
The ectomesenchyme - which was influenced by the neural crest cells

46. What are the formative cells for enamel?
Epithelial rests of Malassez
Ameloblasts
Tooth germ tries to divide
Differentiation

47. What are the mature cells for enamel?
Traumatic injury or crowding of teeth
There are none - they are lost with eruption
Initiation
8th week

48. What is the time span for the bell stage?
Sphere of enamel on root
Hereditary
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
11th to 12th weeks

49. When does the process of root development take place?
Union of root structure of two or more teeth by cementum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Union of 2 adjacent tooth germs
Future dentin and pulp tissue

50. What is tubercle?
11th to 12th weeks
Tall columnar cells
Extra cusp due to effects on enamel organ
The bud stage