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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 of concrescence?
Osteoblasts
Common with permanent maxillary molars
Enamel organ
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.

2. What are the development disturbances of the apposition and maturation stages?
Compressed layer of flat to cuboidal cells
The bud stage
Growth of the dental lamina into bud that penetrates growing ectomesenchyme
Enamel pearl - enamel dysplasia - and concresence

3. What layer serves as protection for the enamel organ?
Odontoclasts
The outer enamel epithelium
Cementocytes
Odontoblastic process

4. What are the clinical ramifications of supernumerary teeth?
Dental follicle
Occurs commonly between the maxillary centrals - distal to the 3rd molars and premolar region. may cause crowding - failureof normal eruption and disruption of occlusion
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 actual vertical movement of the tooth

5. Odontoblasts leave attached cellular extensions in the length of the predentin called what?
Odontoblastic process
Dental follicle
The basement membrane
Initiation

6. What are the etiological factors for anodontia?
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Dens in dente - gemination - tubercle - and fusion
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

7. What are the developmental disturbances of the cap stage?
Dental tissues secreted as matrix in successive layers.
The permanent molars
Differentiation - proliferation - morphogenesis
Dens in dente - gemination - tubercle - and fusion

8. The oral epithelium is induced by the ectomesenchyme to produce what?
An extracellular substance that is partially calcified - yet serves as a framework for later calcification
Alveolar bone
6th to 7th weeks
The dental lamina

9. What are the mature cells for cementum?
The dental sac
Cementocytes
Permanent teeth formed with primary predecessors - the anterior teeth and the premolars
Initiation stage

10. The preameloblasts induce dental papilla cells to differentiate into what?
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
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
Into odontoblasts
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. How is the reduced enamel epithelium created?
9th to 10th weeks
Absence of single or multiple teeth
The enamel organ is compressed
Hereditary - endocrine dysfunction - systemic disease - excess radiation exposure

12. What is 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
Union of root structure of two or more teeth by cementum
Compressed layer of flat to cuboidal cells
Union of 2 adjacent tooth germs

13. What are the formative cells for alveolar bone?
Induction
The ectomesenchyme
Osteoblasts
Morphogenesis

14. What are the clinical ramifications?
Enamel pearl - enamel dysplasia - and concresence
Common on permanent molars or cingulum of anterior teeth
Proliferation - differentiation - morphogenesis
Abnormally large teeth

15. What are the incremental lines for enamel?
Osteoblasts
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.
Lines of Retzuis
An extracellular substance that is partially calcified - yet serves as a framework for later calcification

16. What is the important acelluar structure that seperates the oral epithelium and the ectomesenchyme?
Connective
May be confused as calculus deposit on root
The basement membrane
The ectoderm

17. What stage does anodontia occur?
Compressed layer of flat to cuboidal cells
Future dentin and pulp tissue
Initiation stage
Hereditary

18. What are the clinical ramifications of enamel pearl?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
May be confused as calculus deposit on root
Dentinogenesis - Which is the apposition of dentin matrix - or predentin - on the other side of the basement membrane
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity

19. When does the process of root development take place?
9th to 10th weeks
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Induction - proliferation
Odontoclasts

20. What are the etiological factors for fusion?
Initiation
The dental lamina
To shape the root (or roots) and induce dentin formation in the root area so that it is continuous with coronal dentin
Pressure on the area

21. What are the etiological factors of enamel dysplasia?
Osteoblasts
Hereditary
Local or systemic or hereditary
Epithelial

22. What is the cementum matrix called?
Cementoid
The bud stage
Odontoblasts
8th week

23. The stellate reticulum is located inner or outer?
The enamel organ - dental papilla - dental sac
Maturation
Commonly affects the permanent maxillary lateral incisor. tooth may have deep lingual pit and need endodontic therapy
Outer

24. What are the mature cells for alveolar bone?
Cuboidal cells
Initiation
Osteocytes
The dental lamina

25. What is microdontia?
Dentin and alveolar bone
Dental tissues secreted as matrix in successive layers.
Abnormally small teeth
The bud stage

26. What happens during the bell stage?
The primordium of the pulp
Differentiation of enamel organ into bell with four cell types and dental papilla into two cell types.
Trauma - pressure or metabolic disease
As a result of the apposition of cementum over dentin

27. What are the processes involved in the cap stage?
Differentiation - proliferation - morphogenesis
Cementoblasts
Proliferation - differentiation - morphogenesis
Common on permanent molars or cingulum of anterior teeth

28. What are the 2 layers in the dental papilla within the concavity of the enamel organ?
A mineralized cylinder - the dentinal tubule
The bud stage
Dental follicle
The outer cells of the dental papilla and the central cells of the dental papilla

29. What are the cell layers found in the enamel organ in the bell stage?
Dens in dente - gemination - tubercle - and fusion
The primordium of the pulp
Dental papilla
The outer enamel epithelium - the inner enamel epithelium - the stellate reticulum - and the stratum intermedium

30. What are the mature cells for enamel?
The primordium of the pulp
Compressed layer of flat to cuboidal cells
There are none - they are lost with eruption
The basement membrane

31. In the cap stage the tooth bud does not grow - what happens?
There is unequal growth in different parts of the tooth bud
Tooth germ tries to divide
Dentin secreting cells (odontoblats)
Development of one or more extra teeth

32. What hard tissue has vascularity?
Sphere of enamel on root
Alveolar bone
Epithelial rests of Malassez
Arrest and reversal lines

33. What happens to the thickened non tooth producing portions of the dental lamina eventually?
Odontoblasts
The dental lamina
Alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity

34. What happens during the cap stage?
Tall columnar cells
The enamel organ
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 dental sac

35. What hard tissue is can not have tissue formation after eruption?
Enamel
The dental sac
Pressure on the area
Imbrication lines of von Ebner

36. Active eruption
The stellate reticulum
May be confused as calculus deposit on root
Pitting or intrinsic color changes in enamel. changes in thickness of enamel possible. problems in function and aesthetics
The actual vertical movement of the tooth

37. What is the predominate process of the cap stage?
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
Dental papilla
Morphogenesis

38. What is dens in dente?
Tall columnar cells
Enamel organ invaginates into the dental papilla
Induction
Cementoid

39. What are the etiological factors for supernumerary teeth?
Hereditary
Arrest and reversal lines
The enamel organ is compressed
The basement membrane

40. What is enamel dysplasia?
Trauma - pressure or metabolic disease
Faulty development of enamel from interference involving ameloblasts
Union of root structure of two or more teeth by cementum
The outer enamel epithelium

41. What happens when the reduced enamel epithelium is created?
Inner
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 cementum - PDL - and alveolar bone
May cause disruption of occlusion and aesthetic problems - may need partial or full dentures - bridges - and/or implants

42. Where is the dental sac originally derived from?
Induction
Development of one or more extra teeth
Abnormally small teeth
The ectomesenchyme

43. What are the etiological factors for dens in dente and gemination?
Abnormally small teeth
Common with permanent maxillary molars
Dental papilla
Hereditary

44. 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
Only dentinal tubules with processes
The cementum - PDL - and alveolar bone
It disintegrates as the developing oral mucosa comes to line the oral cavity

45. What is the inner mass in the cap stage that forms a concavity of the enamel organ?
Cementoblasts
Hereditary in localized form. endocrine dysfunction is complete
Dentin and alveolar bone
Dental papilla

46. What happens during the maturation stage?
The disintegration of the basement membrane allows the preameloblasts to come into contact with the newly formed predentin
Dental tissues fully mineralize to their mature levels.
9th to 10th weeks
A bilayer rim that consists only IEE and OEE

47. What hard tissue is innervated by nerves?
Cementocytes
Union of 2 adjacent tooth germs
Dentin and alveolar bone
Dental tissues fully mineralize to their mature levels.

48. What are the incremental lines for dentin?
After the crown is completely shaped and the tooth is starting to erupt into the oral cavity
Common on permanent molars or cingulum of anterior teeth
Imbrication lines of von Ebner
Dental papilla

49. Do odontoblasts start their secretion of matrix before the ameloblasts?
Yes - this is why the dentin is thicker in the mature tooth structure than the enamel
There is unequal growth in different parts of the tooth bud
Large tooth with two pulp cavities. one fewer tooth in dentition. may cause problems in appearance and spacing
The outer enamel epithelium

50. Which layer in the bell stage has star shaped cells?
Tall columnar cells
There are none - they are lost with eruption
The apposition of the enamel matrix
The stellate reticulum