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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 time span for the bud stage?
8th week
Maturation
May be confused as calculus deposit on root
The apposition of the enamel matrix

2. What is concrescence?
Hereditary
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
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
Union of root structure of two or more teeth by cementum

3. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
The basement membrane
The dental lamina
Abnormally small teeth

4. What are succedaneous teeth?
The tooth germ
It disintegrates as the developing oral mucosa comes to line the oral cavity
Compressed layer of flat to cuboidal cells
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

5. What are the mature cells for cementum?
Absence of single or multiple teeth
Induction - proliferation
Cementocytes
Lines of Retzuis

6. What processes are involved with the apposition stage?
Induction - proliferation
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 enamel organ is compressed
The ectoderm

7. What are the clinical ramifications of supernumerary teeth?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Tall columnar cells
Enamel secreting cells (ameloblasts)
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

8. What are the mature cells for dentin?
Dental papilla
The enamel organ - dental papilla - dental sac
Only dentinal tubules with processes
Proliferation

9. What is the function of the Hertwig's epithelial root sheath?
The stellate reticulum
The ectomesenchyme
Union of 2 adjacent tooth germs
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin

10. What are the clinical ramifications of enamel pearl?
May be confused as calculus deposit on root
Development of one or more extra teeth
Osteocytes
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

11. The stellate reticulum is located inner or outer?
Outer
Differentiation
Faulty development of enamel from interference involving ameloblasts
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

12. What is the embryological background for enamel?
Hereditary
Enamel organ
Development of one or more extra teeth
Imbrication lines of von Ebner

13. What are the major components of the tooth germ?
Tooth germ
The enamel organ - dental papilla - dental sac
There is unequal growth in different parts of the tooth bud
It disintegrates as the developing oral mucosa comes to line the oral cavity

14. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Enamel pearl - enamel dysplasia - and concresence
Dens in dente - gemination - tubercle - and fusion
Local or systemic or hereditary
The outer cells of the dental papilla and the central cells of the dental papilla

15. What will the dental papilla eventually form?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Induction - proliferation
A mineralized cylinder - the dentinal tubule
Future dentin and pulp tissue

16. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Enamel organ
Pressure on the area
The dental sac
Traumatic injury or crowding of teeth

17. What are the etiological factors of tubercle?
Cementoblasts
Trauma - pressure or metabolic disease
Differentiation - proliferation - morphogenesis
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

18. What are the etiological factors for enamel pearl?
Enamel organ invaginates into the dental papilla
Cementoid
Displacement of ameloblasts to root surface
The actual vertical movement of the tooth

19. What is the predominate process of the cap stage?
The ameloblasts place an acellular dental cuticle on the new enamel surface
Morphogenesis
The enamel organ - dental papilla - dental sac
Commonly involves permanent maxillary lateral incisor and 3rd molars

20. What are the etiological factors for anodontia?
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
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
The outer enamel epithelium

21. What is gemination?
Tooth germ tries to divide
The basement membrane
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Enamel pearl - enamel dysplasia - and concresence

22. What causes the induction of the preameloblasts to differentiate into ameloblasts?
The actual vertical movement of the tooth
Dentin secreting cells (odontoblats)
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

23. What is the main process involved in initiation?
9th to 10th weeks
Induction
Only dentinal tubules with processes
The ectomesenchyme

24. What happens during the bell stage?
The bud stage
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The ectomesenchyme
Maturation

25. What are the etiological factors for supernumerary teeth?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Lines of Retzuis
The basement membrane
Hereditary

26. How is the reduced enamel epithelium created?
The enamel organ is compressed
Dental tissues secreted as matrix in successive layers.
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
4 types

27. Active eruption
The apposition of the enamel matrix
Dens in dente - gemination - tubercle - and fusion
The actual vertical movement of the tooth
Induction

28. What are the formative cells for alveolar bone?
Dental papilla
Morphogenesis
Osteoblasts
Odontoclasts

29. What is fusion?
Union of 2 adjacent tooth germs
Enamel organ
The ectoderm
Outer

30. What is another name for the dental sac?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dental follicle
Extra cusp due to effects on enamel organ
Initiation stage

31. Where is the dental sac originally derived from?
Compressed layer of flat to cuboidal cells
The ectomesenchyme
Epithelial rests of Malassez
Enamel organ

32. What processes are involved in the bell stage?
Odontoclasts
Maturation
Differentiation - proliferation - morphogenesis
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

33. What stage does supernumerary teeth occur?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Induction - proliferation
During the cap stage
Initiation

34. What are the clinical ramifications of enamel dysplasia?
Cementoblasts
During the cap stage
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The outer enamel epithelium

35. The preameloblasts induce dental papilla cells to differentiate into what?
Into odontoblasts
Cementoblasts
The enamel organ
Cementocytes

36. Where is the enamal organ originally derived from?
The ectoderm
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Epithelial
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane

37. What will the inner cells of the dental lamina differentiates into?
The primordium of the pulp
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
The cervical loop
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

38. What type of tissue is enamel?
Epithelial
The cementum - PDL - and alveolar bone
Common with permanent maxillary molars
Lines of Retzuis

39. What are the incremental lines for dentin?
Imbrication lines of von Ebner
The enamel organ is compressed
Dentin secreting cells (odontoblats)
Commonly involves permanent maxillary lateral incisor and 3rd molars

40. Which teeth are nonsuccedaneous?
Maturation
The permanent molars
The enamel organ is compressed
Odontoblastic process

41. Where does the primordium of the permanent dentition develop?
Extra cusp due to effects on enamel organ
Abnormally large teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

42. What are the formative cells for dentin?
Odontoblasts
As a result of the apposition of cementum over dentin
Epithelial rests of Malassez
When the gingiva recedes and no actual tooth movement takes place

43. What is the embryological background for dentin - cementum and alveolar bone?
Osteoblasts
There are none - they are lost with eruption
Displacement of ameloblasts to root surface
Dental papilla

44. What is the cap in the cap stage?
Enamel organ
When the gingiva recedes and no actual tooth movement takes place
The enamel organ
Future dentin and pulp tissue

45. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
8th week
Only dentinal tubules with processes
Epithelial rests of Malassez
Future dentin and pulp tissue

46. What will the outer cells of the dental lamina differentiate into?
The cervical loop
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
When the gingiva recedes and no actual tooth movement takes place
Dentin secreting cells (odontoblats)

47. In the cap stage the tooth bud does not grow - what happens?
Connective
The cementum - PDL - and alveolar bone
There is unequal growth in different parts of the tooth bud
Dental papilla

48. What happens during initiation?
The cervical loop
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
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Abnormally small teeth

49. What is the predominate process in the bell stage?
Outer
Cementoblasts
Differentiation
Odontoblastic process

50. What does the cervical loop consist of?
A bilayer rim that consists only IEE and OEE
Connective
Development of one or more extra teeth
Dental follicle