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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. The stratum intermediate is located inner or outer?
Inner
Odontoblasts
Cementoblasts
When the gingiva recedes and no actual tooth movement takes place

2. What wll the inner enamel epithelium differentiate into?
Enamel secreting cells (ameloblasts)
Preameloblasts
There are none - they are lost with eruption
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

3. What is the site for the future dentioenamel junction?
There are none - they are lost with eruption
The basement membrane that seperates the enamel organ and dental papilla
Future dentin and pulp tissue
Common with permanent maxillary molars

4. What are the formative cells for dentin?
Odontoblasts
Enamel secreting cells (ameloblasts)
Enamel
Cementocytes

5. What is the embryological background for enamel?
Local or systemic or hereditary
Enamel organ
Abnormally small teeth
The bud stage

6. What type of tissue is dentin - cementum - and alveolar bone?
In the cap stage
9th to 10th weeks
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.
Connective

7. Where is the dental sac originally derived from?
Lines of Retzuis
The ectomesenchyme
Dental tissues secreted as matrix in successive layers.
Dental papilla

8. What are the formative cells for alveolar bone?
Osteoblasts
Faulty development of enamel from interference involving ameloblasts
Common with permanent maxillary molars
The enamel organ is compressed

9. The stellate reticulum is located inner or outer?
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
Outer
There is unequal growth in different parts of the tooth bud
Preameloblasts

10. What will the dental papilla eventually form?
The ameloblasts place an acellular dental cuticle on the new enamel surface
The basement membrane
Future dentin and pulp tissue
Ameloblasts

11. What are the mature cells for dentin?
Dens in dente - gemination - tubercle - and fusion
Only dentinal tubules with processes
Development of one or more extra teeth
The ectomesenchyme

12. What are the odontoblastic processes is contained in what?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Arrest and reversal lines
Extra cusp due to effects on enamel organ
A mineralized cylinder - the dentinal tubule

13. What is anodontia?
Faulty development of enamel from interference involving ameloblasts
Absence of single or multiple teeth
4 types
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

14. What else undergoes proliferation in the bud stage besides the dental lamina?
Common on permanent molars or cingulum of anterior teeth
The basement membrane
The ectomesenchyme
Cementoid

15. Where is the enamal organ originally derived from?
4 types
The ectoderm
Ameloblasts
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

16. What is cementogenisis?
Odontogenesis
Apposition of the cementum
Dentin secreting cells (odontoblats)
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

17. Tooth development
Odontogenesis
Differentiation
Preameloblasts
The basement membrane

18. What cell bodies are involved in the eruption and mineralization process but will be lost after eruption?
Initiation
Union of root structure of two or more teeth by cementum
The ameloblasts
The actual vertical movement of the tooth

19. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Absence of single or multiple teeth
The basement membrane
Epithelial rests of Malassez
Union of root structure of two or more teeth by cementum

20. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The basement membrane
Absence of single or multiple teeth
The ectomesenchyme
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

21. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
The permanent molars
The dental sac
Induction - proliferation
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

22. What are the developmental disturbances of the cap stage?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
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
Imbrication lines of von Ebner
Dens in dente - gemination - tubercle - and fusion

23. What hard tissue is can not have tissue formation after eruption?
Dentin secreting cells (odontoblats)
Odontoblasts
A bilayer rim that consists only IEE and OEE
Enamel

24. What are supernumerary teeth?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Development of one or more extra teeth
Sphere of enamel on root

25. What are the incremental lines for cementum and alveolar bone?
Arrest and reversal lines
The cervical loop
Tall columnar cells
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

26. What are the etiological factors for micro/macrodontia?
Future dentin and pulp tissue
The basement membrane that seperates the enamel organ and dental papilla
May be confused as calculus deposit on root
Hereditary in localized form. endocrine dysfunction is complete

27. When does macro/microdontia occur?
Bud stage
The basement membrane
Dental tissues secreted as matrix 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

28. What are entrapped cementoblasts called?
Dental follicle
Cementocytes
The permanent molars
Enamel

29. What processes are involved in the bell stage?
Differentiation - proliferation - morphogenesis
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
4 types
It disintegrates as the developing oral mucosa comes to line the oral cavity

30. What stage does anodontia occur?
Initiation stage
The ectomesenchyme
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Absence of single or multiple teeth

31. What will the dental sac give rise to?
The enamel - dentin - and cementum are secreted in successive layers
Cementocytes
The cementum - PDL - and alveolar bone
Maturation

32. What happens during the bud stage?
The dental sac
Hereditary
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

33. What happens during the apposition stage?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Dental tissues secreted as matrix in successive layers.
Enamel secreting cells (ameloblasts)

34. Where does the primordium of the permanent dentition develop?
There is unequal growth in different parts of the tooth bud
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The tooth germ
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane

35. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
It disintegrates as the developing oral mucosa comes to line the oral cavity
Trauma - pressure or metabolic disease
Tooth germ

36. The preameloblasts induce dental papilla cells to differentiate into what?
Apposition of the cementum
Into odontoblasts
There are none - they are lost with eruption
Displacement of ameloblasts to root surface

37. What is fusion?
Induction - proliferation
Displacement of ameloblasts to root surface
Union of 2 adjacent tooth germs
The outer cells of the dental papilla and the central cells of the dental papilla

38. What are the mature cells for enamel?
The dental lamina
There are none - they are lost with eruption
The Tomes' process - a tapered portion of each ameloblast that faces the disintegrating basement membrane
Common on permanent molars or cingulum of anterior teeth

39. When does the tooth bud become a tooth germ?
In the cap stage
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Epithelial rests of Malassez
Maturation

40. What happens during initiation?
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 outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dental follicle
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

41. What stage does supernumerary teeth occur?
Hereditary
During the cap stage
Enamel organ invaginates into the dental papilla
Initiation

42. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Morphogenesis
Cementoblasts
A bilayer rim that consists only IEE and OEE
Odontogenesis

43. What are the clinical ramifications of fusion?
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental papilla
Outer

44. What are the etiological factors of concrescence?
Traumatic injury or crowding of teeth
Abnormally small teeth
Trauma - pressure or metabolic disease
Outer

45. When does the process of root development take place?
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
A mineralized cylinder - the dentinal tubule
Faulty development of enamel from interference involving ameloblasts
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

46. Do odontoblasts start their secretion of matrix before the ameloblasts?
Differentiation - proliferation - morphogenesis
Union of root structure of two or more teeth by cementum
Initiation stage
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

47. What are the mature cells for cementum?
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Cementocytes
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Hereditary

48. What are the clinical ramifications of gemination?

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49. What are the incremental lines for enamel?
There are none - they are lost with eruption
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
Lines of Retzuis
The stellate reticulum

50. What are the etiological factors of tubercle?
The cervical loop
Trauma - pressure or metabolic disease
Tooth germ tries to divide
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion