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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 structure responsible for root development?
The cervical loop
Inner
Alveolar bone
4 types

2. What are the clinical ramifications of fusion?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Cuboidal cells
The bud stage
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

3. What are the etiological factors for supernumerary teeth?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Hereditary
Sphere of enamel on root
Hereditary in localized form. endocrine dysfunction is complete

4. What is the process involved in the maturation stage?
Proliferation
Pressure on the area
Maturation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

5. How is the reduced enamel epithelium created?
The ectoderm
Union of root structure of two or more teeth by cementum
The enamel organ is compressed
Future dentin and pulp tissue

6. The oral epithelium is induced by the ectomesenchyme to produce what?
Osteocytes
The dental lamina
The enamel - dentin - and cementum are secreted in successive layers
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

7. What is the predominate process of the cap stage?
The enamel organ is compressed
Morphogenesis
Pressure on the area
Odontoclasts

8. What is the embryological background for dentin - cementum and alveolar bone?
Alveolar bone
Displacement of ameloblasts to root surface
Dental papilla
Dental tissues secreted as matrix in successive layers.

9. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Arrest and reversal lines
The outer cells of the dental papilla and the central cells of the dental papilla
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

10. What is macrodontia?
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
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Abnormally large teeth
The primordium of the pulp

11. What happens during the bud stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The enamel organ is compressed
Dentin secreting cells (odontoblats)
Enamel pearl - enamel dysplasia - and concresence

12. What are the clinical ramifications of anodontia?
Differentiation
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Dental tissues secreted as matrix in successive layers.
Extra cusp due to effects on enamel organ

13. What is the embryological background for enamel?
Enamel organ
Induction - proliferation
Enamel organ invaginates into the dental papilla
Cementocytes

14. What is the cap in the cap stage?
The enamel organ
Initiation
Extra cusp due to effects on enamel organ
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

15. What are the developmental disturbances of the cap stage?
Odontoclasts
The permanent molars
Dens in dente - gemination - tubercle - and fusion
9th to 10th weeks

16. What happens during the maturation stage?
Hereditary in localized form. endocrine dysfunction is complete
There are none - they are lost with eruption
Tall columnar cells
Dental tissues fully mineralize to their mature levels.

17. What are the clinical ramifications of dens in dente?
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The stellate reticulum

18. What are the mature cells for dentin?
11th to 12th weeks
Only dentinal tubules with processes
The outer cells of the dental papilla and the central cells of the dental papilla
Union of 2 adjacent tooth germs

19. What happens during the cap stage?
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
Bud stage
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.
Trauma - pressure or metabolic disease

20. Tooth development
Odontogenesis
The permanent molars
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
9th to 10th weeks

21. Where is the enamal organ originally derived from?
Cementocytes
The actual vertical movement of the tooth
Connective
The ectoderm

22. What are the etiological factors for dens in dente and gemination?
Traumatic injury or crowding of teeth
6th to 7th weeks
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Hereditary

23. The stratum intermediate is located inner or outer?
Epithelial rests of Malassez
Dentin and alveolar bone
Apposition of the cementum
Inner

24. What are the mature cells for cementum?
The ectomesenchyme
As a result of the apposition of cementum over dentin
Faulty development of enamel from interference involving ameloblasts
Cementocytes

25. What are the mature cells for enamel?
There are none - they are lost with eruption
The dental sac
Tooth germ
Outer

26. What is the function of the Hertwig's epithelial root sheath?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Cuboidal cells
The basement membrane that seperates the enamel organ and dental papilla
Only dentinal tubules with processes

27. What happens during the apposition stage?
4 types
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.
Dental tissues secreted as matrix in successive layers.
Extra cusp due to effects on enamel organ

28. Active eruption
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Apposition of the cementum
The actual vertical movement of the tooth

29. What are the clinical ramifications of concrescence?
As a result of the apposition of cementum over dentin
The ameloblasts
Common with permanent maxillary molars
The dental lamina

30. What is gemination?
Tooth germ tries to divide
9th to 10th weeks
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Cementocytes

31. What does the cervical loop consist of?
The dental lamina
Odontoblastic process
A bilayer rim that consists only IEE and OEE
Alveolar bone

32. What are the incremental lines for dentin?
Imbrication lines of von Ebner
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
The basement membrane
Epithelial

33. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
Initiation stage
Dens in dente - gemination - tubercle - and fusion
Displacement of ameloblasts to root surface
Epithelial rests of Malassez

34. What are the clinical ramifications?
Abnormally large teeth
The tooth germ
Bud stage
Common on permanent molars or cingulum of anterior teeth

35. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
The ectoderm
The outer cells of the dental papilla and the central cells of the dental papilla
Tooth germ
Proliferation

36. How many types of cells are 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
Tooth germ tries to divide
Tooth germ
4 types

37. What is another name for the dental sac?
Cementocytes
Maturation
Abnormally large teeth
Dental follicle

38. What is the predominate process in the bell stage?
Union of 2 adjacent tooth germs
Tooth germ
The enamel organ is compressed
Differentiation

39. What are the formative cells for cementum?
The ameloblasts
Arrest and reversal lines
8th week
Cementoblasts

40. What processes are involved with the apposition stage?
Maturation
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal 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
Induction - proliferation

41. Where is the dental sac originally derived from?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Odontoclasts
During the cap stage
The ectomesenchyme

42. What are the etiological factors for fusion?
Morphogenesis
Common with permanent maxillary molars
The apposition of the enamel matrix
Pressure on the area

43. Where does the primordium of the permanent dentition develop?
Lines of Retzuis
Hereditary
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

44. What hard tissue has vascularity?
Connective
The enamel organ
Alveolar bone
Dental tissues fully mineralize to their mature levels.

45. What are the clinical ramifications of supernumerary teeth?
The ectomesenchyme
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
Absence of single or multiple teeth

46. What is the time span for the bud stage?
Enamel organ
Outer
Morphogenesis
8th week

47. What are the processes involved in the cap stage?
Proliferation
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Extra cusp due to effects on enamel organ
Proliferation - differentiation - morphogenesis

48. What is the time span for initiation?
Bud stage
6th to 7th weeks
Epithelial
Dental tissues secreted as matrix in successive layers.

49. Which teeth are nonsuccedaneous?
The cementum - PDL - and alveolar bone
The cervical loop
The permanent molars
Dens in dente - gemination - tubercle - and fusion

50. What is the main process involved in initiation?
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
Induction
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
The basement membrane