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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 type of tissue is dentin - cementum - and alveolar bone?
Preameloblasts
The outer enamel epithelium
The cementum - PDL - and alveolar bone
Connective

2. What are the formative cells for cementum?
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.
Cementoblasts
Maturation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

3. What stage does anodontia occur?
Cuboidal cells
Initiation stage
Epithelial
In the cap stage

4. When does dens in dente occur?
During the cap stage
Epithelial rests of Malassez
Dental follicle
The outer enamel epithelium

5. What is the embryological background for enamel?
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Dental follicle

6. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
The cervical loop
Cementoblasts
Maturation
Union of 2 adjacent tooth germs

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

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8. What are the clinical ramifications of dens in dente?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Enamel
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
In the cap stage

9. What are the etiological factors of enamel dysplasia?
Differentiation - proliferation - morphogenesis
Local or systemic or hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
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.

10. What is the cap in the cap stage?
9th to 10th weeks
Dental papilla
The enamel organ
The bud stage

11. How many types of cells are found in the enamel organ in the bell stage?
8th week
Local or systemic or hereditary
The ectoderm
4 types

12. What hard tissue is can not have tissue formation after eruption?
Dentin secreting cells (odontoblats)
Odontogenesis
Osteoblasts
Enamel

13. The preameloblasts induce dental papilla cells to differentiate into what?
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
Cementocytes
Into odontoblasts
May be confused as calculus deposit on root

14. What are the clinical ramifications of micro/macrodontia?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Epithelial rests of Malassez
Local or systemic or hereditary
Commonly involves permanent maxillary lateral incisor and 3rd molars

15. What is the time span for the bell stage?
Abnormally small teeth
The cervical loop
11th to 12th weeks
Enamel

16. What is the predominate process of the cap stage?
The basement membrane
Union of 2 adjacent tooth germs
A mineralized cylinder - the dentinal tubule
Morphogenesis

17. What is anodontia?
Absence of single or multiple teeth
Extra cusp due to effects on enamel organ
There is unequal growth in different parts of the tooth bud
Hereditary

18. Where is the enamal organ originally derived from?
The ectoderm
The cementum - PDL - and alveolar bone
The outer enamel epithelium
The enamel organ is compressed

19. What are the incremental lines for dentin?
Enamel
Cuboidal cells
The stellate reticulum
Imbrication lines of von Ebner

20. Where is the dental sac originally derived from?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Connective
The ectomesenchyme

21. What are the mature cells for enamel?
The apposition of the enamel matrix
Displacement of ameloblasts to root surface
Local or systemic or hereditary
There are none - they are lost with eruption

22. Which layer in the bell stage has star shaped cells?
Union of 2 adjacent tooth germs
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The enamel - dentin - and cementum are secreted in successive layers
The stellate reticulum

23. How is the reduced enamel epithelium created?
Hereditary
Dental follicle
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
The enamel organ is compressed

24. What processes are involved with the apposition stage?
Trauma - pressure or metabolic disease
Commonly involves permanent maxillary lateral incisor and 3rd molars
Preameloblasts
Induction - proliferation

25. When does the process of root development take place?
Union of 2 adjacent tooth germs
Apposition of the cementum
The cementum - PDL - and alveolar bone
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

26. What will the outer cells of the dental lamina differentiate into?
Dentin secreting cells (odontoblats)
Enamel
Tooth germ
Dental follicle

27. What are the developmental disturbances of the cap stage?
Dens in dente - gemination - tubercle - and fusion
Displacement of ameloblasts to root surface
The apposition of the enamel matrix
Hereditary in localized form. endocrine dysfunction is complete

28. When does the tooth bud become a tooth germ?
Faulty development of enamel from interference involving ameloblasts
In the cap stage
Connective
There is unequal growth in different parts of the tooth bud

29. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The permanent molars
May be confused as calculus deposit on root
The enamel organ
Odontoclasts

30. How is the dentinocemental junction formed?
As a result of the apposition of cementum over dentin
Development of one or more extra teeth
Tooth germ
When the gingiva recedes and no actual tooth movement takes place

31. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The basement membrane
The ectomesenchyme
Preameloblasts
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

32. What are the clinical ramifications of supernumerary teeth?
8th week
The enamel - dentin - and cementum are secreted in successive layers
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Trauma - pressure or metabolic disease

33. What are the mature cells for cementum?
Proliferation
During the cap stage
Pressure on the area
Cementocytes

34. What will the dental papilla eventually form?
Absence of single or multiple teeth
Dental tissues fully mineralize to their mature levels.
Future dentin and pulp tissue
Dens in dente - gemination - tubercle - and fusion

35. What are supernumerary teeth?
Hereditary in localized form. endocrine dysfunction is complete
Enamel organ
The enamel organ
Development of one or more extra teeth

36. What happens during initiation?
During the cap stage
9th to 10th weeks
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
Lines of Retzuis

37. What happens when the reduced enamel epithelium is created?
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
Proliferation
The ectomesenchyme
Morphogenesis

38. What happens during the appositional stage?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the 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
The enamel - dentin - and cementum are secreted in successive layers
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

39. What is the structure responsible for root development?
Enamel secreting cells (ameloblasts)
The ectomesenchyme
Cementoid
The cervical loop

40. Where is the dental papilla originally derived from?
The ectomesenchyme - which was influenced by the neural crest cells
The tooth germ
Morphogenesis
Union of 2 adjacent tooth germs

41. Do odontoblasts start their secretion of matrix before the ameloblasts?
Dentin and alveolar bone
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Epithelial
Morphogenesis

42. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dentin and alveolar bone
Into odontoblasts
Odontoblastic process
Union of 2 adjacent tooth germs

43. What is microdontia?
Only dentinal tubules with processes
Absence of single or multiple teeth
There is unequal growth in different parts of the tooth bud
Abnormally small teeth

44. What is matrix?
Lines of Retzuis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Inner
There are none - they are lost with eruption

45. What are the incremental lines for cementum and alveolar bone?
Preameloblasts
Arrest and reversal lines
The ameloblasts place an acellular dental cuticle on the new enamel surface
Faulty development of enamel from interference involving ameloblasts

46. What are the clinical ramifications of fusion?
The enamel organ - dental papilla - dental sac
The basement membrane
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
There is unequal growth in different parts of the tooth bud

47. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The bud stage
Traumatic injury or crowding of teeth
Imbrication lines of von Ebner

48. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The enamel organ
Dental papilla
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The bud stage

49. What happens during the maturation stage?
The primordium of the pulp
Faulty development of enamel from interference involving ameloblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Dental tissues fully mineralize to their mature levels.

50. What is concrescence?
The basement membrane
When the gingiva recedes and no actual tooth movement takes place
Union of root structure of two or more teeth by cementum
Only dentinal tubules with processes