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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 important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
The ectomesenchyme
Cementoblasts
The basement membrane
There is unequal growth in different parts of the tooth bud

2. What happens during the bell stage?
The enamel organ is compressed
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Maturation
Enamel organ

3. Which teeth are nonsuccedaneous?
Hereditary
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The permanent molars
The dental lamina

4. What happens during the appositional stage?
Cementoblasts
The cementum - PDL - and alveolar bone
The enamel - dentin - and cementum are secreted in successive layers
When the gingiva recedes and no actual tooth movement takes place

5. What are the cell layers found in the enamel organ in the bell stage?
Cementoid
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The ectomesenchyme

6. What are the clinical ramifications of dens in dente?
Osteoblasts
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Odontoblastic process
Maturation

7. How is the reduced enamel epithelium created?
The basement membrane
Initiation stage
The enamel organ is compressed
Dental papilla

8. When does macro/microdontia occur?
Dens in dente - gemination - tubercle - and fusion
Bud stage
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
A bilayer rim that consists only IEE and OEE

9. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
Common on permanent molars or cingulum of anterior teeth
The bud stage
Dental papilla
Preameloblasts

10. What are the etiological factors for dens in dente and gemination?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
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
Hereditary
Into odontoblasts

11. What are the clinical ramifications of concrescence?
Common with permanent maxillary molars
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Enamel organ invaginates into the dental papilla
There are none - they are lost with eruption

12. Where is the dental papilla originally derived from?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Local or systemic or hereditary
The ectomesenchyme - which was influenced by the neural crest cells
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

13. What wll the inner enamel epithelium differentiate into?
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.
Outer
Dens in dente - gemination - tubercle - and fusion
Enamel secreting cells (ameloblasts)

14. What will the inner cells of the dental lamina differentiates into?
The ectomesenchyme
Dens in dente - gemination - tubercle - and fusion
Alveolar bone
The primordium of the pulp

15. The buds of the dental lamina - together with the surrounding ecto mesenchyme - will develop into what?
Hereditary
Cuboidal cells
9th to 10th weeks
Tooth germ

16. What are the etiological factors for enamel pearl?
The outer enamel epithelium
The ectomesenchyme - which was influenced by the neural crest cells
Displacement of ameloblasts to root surface
Into odontoblasts

17. What are the etiological factors for supernumerary teeth?
Hereditary
The enamel organ is compressed
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Abnormally large teeth

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

19. What stage does the dental tissues subsequently fully mineralize
Tooth germ tries to divide
Maturation
The outer enamel epithelium
Bud stage

20. What is the predominate process of the cap stage?
Morphogenesis
Dental papilla
Abnormally small teeth
It disintegrates as the developing oral mucosa comes to line the oral cavity

21. What are entrapped cementoblasts called?
Cementocytes
Local or systemic or hereditary
Induction - proliferation
Bud stage

22. What are the incremental lines for dentin?
Imbrication lines of von Ebner
The apposition of the enamel matrix
The ameloblasts place an acellular dental cuticle on the new enamel surface
Morphogenesis

23. What happens to the thickened non tooth producing portions of the dental lamina eventually?
The cementum - PDL - and alveolar bone
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
It disintegrates as the developing oral mucosa comes to line the oral cavity

24. What is the time span for initiation?
Initiation stage
May be confused as calculus deposit on root
4 types
6th to 7th weeks

25. What conveys communications between the cells of the enamel organ - the dental papilla - and the dental sac allowing tissue interactions?
The apposition of the enamel matrix
The basement membrane
The enamel organ
The dental sac

26. When does the tooth bud become a tooth germ?
There is unequal growth in different parts of the tooth bud
In the cap stage
Maturation
The basement membrane

27. What is the main process involved in initiation?
The ectomesenchyme
The stellate reticulum
Dental tissues secreted as matrix in successive layers.
Induction

28. What are the mature cells for alveolar bone?
Osteocytes
When the gingiva recedes and no actual tooth movement takes place
The bud stage
Trauma - pressure or metabolic disease

29. The remaining ectomesenchyme surrounding the outside of the enamel organ condenses into what?
Bud stage
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Odontoblasts
The dental sac

30. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Dentin and alveolar bone
Differentiation
Odontoblastic process
Osteoblasts

31. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
The bud stage
Dentin secreting cells (odontoblats)
Cementoid
Dental papilla

32. What are the etiological factors of concrescence?
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
In the cap stage
Enamel
Traumatic injury or crowding of teeth

33. What is the embryological background for dentin - cementum and alveolar bone?
Future dentin and pulp tissue
Dental papilla
Pressure on the area
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel

34. What are the clinical ramifications of gemination?

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35. What hard tissue is can not have tissue formation after eruption?
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
Odontoclasts
Dental papilla
Enamel

36. What is the structure responsible for root development?
Common on permanent molars or cingulum of anterior teeth
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
Local or systemic or hereditary
The cervical loop

37. What are the incremental lines for enamel?
May be confused as calculus deposit 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
Lines of Retzuis
Displacement of ameloblasts to root surface

38. What are the etiological factors for micro/macrodontia?
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.
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The cementum - PDL - and alveolar bone
Hereditary in localized form. endocrine dysfunction is complete

39. What is cementogenisis?
Inner
Apposition of the cementum
Union of 2 adjacent tooth germs
The ameloblasts place an acellular dental cuticle on the new enamel surface

40. What is the process involved in the maturation stage?
The dental lamina
Maturation
Connective
Dentin and alveolar bone

41. Where is the dental sac originally derived from?
A mineralized cylinder - the dentinal tubule
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
The ectomesenchyme
Initiation stage

42. What do the odontoblasts do?
Abnormally small teeth
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
8th week

43. When does dens in dente occur?
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.
Induction
Initiation
During the cap stage

44. What are the mature cells for cementum?
When the gingiva recedes and no actual tooth movement takes place
Cementocytes
Odontoblasts
The basement membrane

45. What is concrescence?
6th to 7th weeks
Odontoclasts
Union of root structure of two or more teeth by cementum
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

46. What is an enamel pearl?
Union of 2 adjacent tooth germs
The bud stage
Sphere of enamel on root
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

47. What are the formative cells for enamel?
Epithelial
Ameloblasts
Abnormally small teeth
Proliferation

48. What are the etiological factors of tubercle?
Abnormally large teeth
Hereditary
Dentin secreting cells (odontoblats)
Trauma - pressure or metabolic disease

49. What causes the induction of the preameloblasts to differentiate into ameloblasts?
Hereditary in localized form. endocrine dysfunction is complete
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
8th week
Inner

50. What is dens in dente?
Dental papilla
Enamel organ invaginates into the dental papilla
A bilayer rim that consists only IEE and OEE
Ameloblasts