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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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1. After the enamel apposition ceases the crown area of each primary or permanent tooth what happens?
Into odontoblasts
Initiation stage
Cementoblasts
The ameloblasts place an acellular dental cuticle on the new enamel surface

2. What are the etiological factors for supernumerary teeth?
Dental tissues fully mineralize to their mature levels.
Union of root structure of two or more teeth by cementum
Hereditary
Dental papilla

3. What is the embryological background for enamel?
Enamel pearl - enamel dysplasia - and concresence
Enamel organ
Odontogenesis
The enamel organ

4. The stage named for extensive proliferation of the dental lamina into oval masses penetrating into the ectomesenchyme?
The bud stage
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
11th to 12th weeks
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

5. What is the site for the future dentioenamel junction?
The basement membrane that seperates the enamel organ and dental papilla
During the cap stage
Union of 2 adjacent tooth germs
In the cap stage

6. What is cementogenisis?
Enamel pearl - enamel dysplasia - and concresence
Initiation
Apposition of the cementum
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy

7. How is the dentinocemental junction formed?
Differentiation - proliferation - morphogenesis
As a result of the apposition of cementum over dentin
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Connective

8. When the undifferentiated cells of the dental sac come into contact with the root dentin they differentiate into what?
Enamel organ
Cementoblasts
Cementocytes
Differentiation

9. The stellate reticulum is located inner or outer?
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
Outer
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Displacement of ameloblasts to root surface

10. What are the clinical ramifications of fusion?
Traumatic injury or crowding of teeth
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
Dens in dente - gemination - tubercle - and fusion
Cuboidal cells

11. What will the dental sac give rise to?
The ectoderm
The cementum - PDL - and alveolar bone
Odontoclasts
Enamel pearl - enamel dysplasia - and concresence

12. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
The outer cells of the dental papilla and the central cells of the dental papilla
Odontoblastic process
Ameloblasts
Maturation

13. What is another name for the dental sac?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Induction - proliferation
Osteocytes
Dental follicle

14. Where is the dental sac originally derived from?
The ectomesenchyme
Osteocytes
Maturation
Enamel pearl - enamel dysplasia - and concresence

15. What will the outer cells of the dental lamina differentiate into?
Tooth germ
Dentin secreting cells (odontoblats)
9th to 10th weeks
The outer enamel epithelium

16. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Tall columnar cells
Dental tissues fully mineralize to their mature levels.
The cementum - PDL - and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity

17. What is microdontia?
Proliferation - differentiation - morphogenesis
Oral epithelium
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Abnormally small teeth

18. What happens during the bell stage?
In the cap stage
May be confused as calculus deposit on root
Differentiation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

19. How is the reduced enamel epithelium created?
The ectoderm
Differentiation - proliferation - morphogenesis
May be confused as calculus deposit on root
The enamel organ is compressed

20. What is the cementum matrix called?
Cementoid
The cervical loop
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
Dentin and alveolar bone

21. What is the primordium of the tooth?
The stellate reticulum
There are none - they are lost with eruption
The tooth germ
Cementoid

22. What are the etiological factors of tubercle?
Trauma - pressure or metabolic disease
Dentin and alveolar bone
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
A bilayer rim that consists only IEE and OEE

23. What processes are involved with the apposition stage?
The successional dental lamina - an extension of the dental lamina that extends out lingually to the primary tooth germs
6th to 7th weeks
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Induction - proliferation

24. What are the odontoblastic processes is contained in what?
Odontoblastic process
The basement membrane
Proliferation - differentiation - morphogenesis
A mineralized cylinder - the dentinal tubule

25. What is dens in dente?
Enamel organ invaginates into the dental papilla
Tooth germ tries to divide
The tooth germ
The ameloblasts place an acellular dental cuticle on the new enamel surface

26. What are the etiological factors for dens in dente and gemination?
A bilayer rim that consists only IEE and OEE
The enamel organ
Preameloblasts
Hereditary

27. What is the process involved in the maturation stage?
Cementoid
Maturation
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Into odontoblasts

28. What is concrescence?
Union of root structure of two or more teeth by cementum
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Enamel
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin

29. When does the process of root development take place?
4 types
Enamel
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction - proliferation

30. What is gemination?
Cementoblasts
Tooth germ tries to divide
The apposition of the enamel matrix
Alveolar bone

31. What are the incremental lines for enamel?
Lines of Retzuis
The apposition of the enamel matrix
Union of 2 adjacent tooth germs
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing

32. What are the etiological factors for anodontia?
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure
Epithelial
The permanent molars
Odontoblasts

33. What happens during the bud stage?
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Enamel
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants
Growth of the dental lamina into bud that penetrates growing ectomesenchyme

34. The stratum intermediate is located inner or outer?
Inner
Bud stage
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
The enamel organ

35. What are the formative cells for alveolar bone?
Odontoclasts
Dental follicle
Osteoblasts
Initiation stage

36. What are the clinical ramifications of micro/macrodontia?
It disintegrates as the developing oral mucosa comes to line the oral cavity
Initiation
The primordium of the pulp
Commonly involves permanent maxillary lateral incisor and 3rd molars

37. What hard tissue is can not have tissue formation after eruption?
Enamel
Proliferation
Induction - proliferation
Cementoid

38. What are the clinical ramifications of gemination?

39. What stage does supernumerary teeth occur?
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
Osteocytes
Initiation

40. What kind of cells reside in the stratum intermediate?
Compressed layer of flat to cuboidal cells
In the cap stage
Differentiation - proliferation - morphogenesis
Dental papilla

41. What are the mature cells for alveolar bone?
Osteocytes
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Alveolar bone
Initiation stage

42. What is the time span for initiation?
Abnormally small teeth
6th to 7th weeks
Common with permanent maxillary molars
Commonly involves permanent maxillary lateral incisor and 3rd molars

43. What are the mature cells for enamel?
There are none - they are lost with eruption
Dental papilla
Ameloblasts
In the cap stage

44. What will the inner cells of the dental lamina differentiates into?
Enamel
Connective
The dental sac
The primordium of the pulp

45. Tooth development
In the cap stage
Odontogenesis
The cementum - PDL - and alveolar bone
Enamel pearl - enamel dysplasia - and concresence

46. When does the tooth bud become a tooth germ?
Faulty development of enamel from interference involving ameloblasts
The ectomesenchyme - which was influenced by the neural crest cells
In the cap stage
Osteoblasts

47. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
Odontogenesis
Compressed layer of flat to cuboidal cells
The outer cells of the dental papilla and the central cells of the dental papilla
Epithelial

48. 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
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

49. What are supernumerary teeth?
Development of one or more extra teeth
Cementoid
Cementocytes
Cementoblasts

50. What are the cell layers found in the enamel organ in the bell stage?
Cementoblasts
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium
When the gingiva recedes and no actual tooth movement takes place
Enamel pearl - enamel dysplasia - and concresence