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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 clinical ramifications?
Enamel organ invaginates into the dental papilla
Common on permanent molars or cingulum of anterior teeth
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
The basement membrane

2. When does dens in dente occur?
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
During the cap stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Union of root structure of two or more teeth by cementum

3. What are succedaneous teeth?
Sphere of enamel on root
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 organ
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars

4. The oral epithelium is induced by the ectomesenchyme to produce what?
The enamel organ is compressed
The ectomesenchyme - which was influenced by the neural crest cells
Union of root structure of two or more teeth by cementum
The dental lamina

5. What are the development disturbances of the apposition and maturation stages?
The ameloblasts
Cementocytes
Extra cusp due to effects on enamel organ
Enamel pearl - enamel dysplasia - and concresence

6. When root formation is completed the portion of the basement membrane disintegrates its cells may become what?
When the gingiva recedes and no actual tooth movement takes place
Into odontoblasts
Epithelial rests of Malassez
May be confused as calculus deposit on root

7. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
Dentin secreting cells (odontoblats)
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 basement membrane
Odontoblastic process

8. What is concrescence?
Union of root structure of two or more teeth by cementum
Preameloblasts
Hereditary
The ectomesenchyme

9. Which layer in the bell stage has star shaped cells?
During the cap stage
The stellate reticulum
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Enamel

10. What are the etiological factors for supernumerary teeth?
The primordium of the pulp
Hereditary
The dental lamina
The apposition of the enamel matrix

11. What processes are involved with the apposition stage?
Common on permanent molars or cingulum of anterior teeth
Induction - proliferation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel secreting cells (ameloblasts)

12. The stellate reticulum is located inner or outer?
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Outer

13. What processes are involved in the bell stage?
Osteoblasts
Odontoclasts
Abnormally small teeth
Differentiation - proliferation - morphogenesis

14. What is the predominate process of the cap stage?
Future dentin and pulp tissue
Osteocytes
Faulty development of enamel from interference involving ameloblasts
Morphogenesis

15. What is an enamel pearl?
Sphere of enamel on root
As a result of the apposition of cementum over dentin
Apposition of the cementum
The enamel organ - dental papilla - dental sac

16. What is the primordium of the tooth?
Cementoid
The basement membrane
The tooth germ
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

17. What is the outer portion of the ectoderm in the initiation stage?
Oral epithelium
Dentin secreting cells (odontoblats)
Dental follicle
Dental papilla

18. What is amelogenisis?
The apposition of the enamel matrix
Preameloblasts
8th week
Enamel organ

19. What is enamel dysplasia?
Faulty development of enamel from interference involving ameloblasts
Preameloblasts
Development of one or more extra teeth
Dental follicle

20. What happens during initiation?
Development of one or more extra teeth
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
Displacement of ameloblasts to root surface

21. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
Maturation
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

22. What are the mature cells for cementum?
Dens in dente - gemination - tubercle - and fusion
Dentin and alveolar bone
Cementocytes
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

23. What is anodontia?
During the cap stage
Trauma - pressure or metabolic disease
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Absence of single or multiple teeth

24. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Hereditary
Tooth germ
Commonly involves permanent maxillary lateral incisor and 3rd molars
Sphere of enamel on root

25. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Dentin secreting cells (odontoblats)
The enamel organ
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
It disintegrates as the developing oral mucosa comes to line the oral cavity

26. What is the embryological background for dentin - cementum and alveolar bone?
Cementocytes
It disintegrates as the developing oral mucosa comes to line the oral cavity
Dental papilla
Morphogenesis

27. Passive eruption
Displacement of ameloblasts to root surface
Compressed layer of flat to cuboidal cells
Cuboidal cells
When the gingiva recedes and no actual tooth movement takes place

28. What will the dental sac give rise to?
The bud stage
4 types
The primordium of the pulp
The cementum - PDL - and alveolar bone

29. What are the major components of the tooth germ?
Abnormally large teeth
The enamel organ - dental papilla - dental sac
Dentin secreting cells (odontoblats)
Differentiation - proliferation - morphogenesis

30. What kind of cells reside in the stratum intermediate?
Faulty development of enamel from interference involving ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells
Compressed layer of flat to cuboidal cells
Dentin and alveolar bone

31. What type of tissue is enamel?
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 outer enamel epithelium
Epithelial
Oral epithelium

32. What kind of cells occur in the inner enamel epithelium?
Development of one or more extra teeth
Abnormally small teeth
Tall columnar cells
The ameloblasts place an acellular dental cuticle on the new enamel surface

33. What are the processes involved in the cap stage?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Future dentin and pulp tissue
Dens in dente - gemination - tubercle - and fusion
Proliferation - differentiation - morphogenesis

34. What are the resorptive cells for enamel - dentin - cementum and alveolar bone?
The ameloblasts
Odontoclasts
Only dentinal tubules with processes
The enamel organ

35. How is the reduced enamel epithelium created?
Cementocytes
A bilayer rim that consists only IEE and OEE
The enamel organ is compressed
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

36. What are the mature cells for dentin?
Only dentinal tubules with processes
The basement membrane
Cementocytes
The enamel organ

37. What are the etiological factors of enamel dysplasia?
Odontoblasts
Local or systemic or hereditary
Imbrication lines of von Ebner
Development of one or more extra teeth

38. What is the process involved in the maturation stage?
Maturation
Union of 2 adjacent tooth germs
The basement membrane
Dental tissues fully mineralize to their mature levels.

39. What are the formative cells for cementum?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
Cementoblasts
Dental papilla
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

40. Tooth development
Odontogenesis
Dental tissues secreted as matrix in successive layers.
Hereditary
Osteocytes

41. What is gemination?
Tooth germ tries to divide
Induction - proliferation
Cuboidal cells
Initiation

42. What hard tissue is can not have tissue formation after eruption?
Enamel
Dental tissues secreted as matrix in successive layers.
Traumatic injury or crowding of teeth
The ectomesenchyme - which was influenced by the neural crest cells

43. What kind of cells occur in the outer enamel epithelium in the bell stage?
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The ameloblasts
Cuboidal cells
Dens in dente - gemination - tubercle - and fusion

44. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The enamel organ is compressed
Outer
Odontoblastic process
Enamel organ invaginates into the dental papilla

45. What are the formative cells for dentin?
Hereditary
Odontoblasts
Initiation
Maturation

46. In the cap stage the tooth bud does not grow - what happens?
9th to 10th weeks
There is unequal growth in different parts of the tooth bud
Local or systemic or hereditary
Dentin and alveolar bone

47. What are the incremental lines for dentin?
Imbrication lines of von Ebner
Differentiation - proliferation - morphogenesis
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Bud stage

48. What are the incremental lines for enamel?
Lines of Retzuis
6th to 7th weeks
Dentin and alveolar bone
Cementocytes

49. When does macro/microdontia occur?
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
It disintegrates as the developing oral mucosa comes to line the oral cavity
Hereditary
Bud stage

50. What are the etiological factors for enamel pearl?
Hereditary
Maturation
Displacement of ameloblasts to root surface
May be confused as calculus deposit on root